C#编写的windows计算器

using system;using system.drawing;using system.windows;using system.windows.forms;using system.collections;using system.componentmodel;using system.data;namespace comput{    /// <summary>    /// 这是一个安置器的大概举行。    /// </summary>    public class form1 : system.windows.forms.form    {        #region 控件表明            private system.windows.forms.textbox txtshow;        private system.windows.forms.groupbox groupbox1;        private system.windows.forms.button btn_rev;        private system.windows.forms.button btn_dot;        private system.windows.forms.button btn_add;        private system.windows.forms.button btn_equ;        private system.windows.forms.button btn_sign;        private system.windows.forms.button btn_sub;        private system.windows.forms.button btn_mul;        private system.windows.forms.button btn_0;        private system.windows.forms.button btn_3;        private system.windows.forms.button btn_2;        private system.windows.forms.button btn_1;        private system.windows.forms.button btn_6;        private system.windows.forms.button btn_5;        private system.windows.forms.button btn_4;        private system.windows.forms.button btn_sqrt;        private system.windows.forms.button btn_div;        private system.windows.forms.button btn_7;        private system.windows.forms.button btn_8;        private system.windows.forms.button btn_9;        private system.windows.forms.mainmenu mainmenu1;        private system.windows.forms.menuitem menuitem1;        private system.windows.forms.button btn_sqr;        private system.windows.forms.menuitem menuitem2;        private system.windows.forms.menuitem menuitem3;        private system.windows.forms.menuitem menuitem4;        private system.windows.forms.menuitem menuitem5;        private system.windows.forms.menuitem menuitem6;        private system.windows.forms.button c;        private system.windows.forms.button ce;        private system.windows.forms.menuitem menuitem8;        private system.windows.forms.menuitem menuitem9;        private system.windows.forms.menuitem menuitem10;        /// <summary>        /// 必然的安置器变量。        /// </summary>        private system.componentmodel.container components = null;                        public form1()        {            //            // windows 窗体安置器辅助所必然的            //            initializecomponent();            //            // todo: 在 initializecomponent 调用后填补任何构造因变量代码            //        }                /// <summary>        /// 整治十足正在应用的资源。        /// </summary>        protected override void dispose( bool disposing )        {            if( disposing )            {                if (components != null)                 {                    components.dispose();                }            }            base.dispose( disposing );        }       #endregion        #region 各控件的属性的本事windows form designer generated code        /// <summary>        /// 安置器辅助所需的本事 - 不要应用代码编辑器篡改        /// 此本事的本质。        /// </summary>        private void initializecomponent()        {            system.resources.resourcemanager resources = new system.resources.resourcemanager(typeof(form1));            this.txtshow = new system.windows.forms.textbox();            this.groupbox1 = new system.windows.forms.groupbox();            this.c = new system.windows.forms.button();            this.ce = new system.windows.forms.button();            this.btn_rev = new system.windows.forms.button();            this.btn_dot = new system.windows.forms.button();            this.btn_add = new system.windows.forms.button();            this.btn_equ = new system.windows.forms.button();            this.btn_sign = new system.windows.forms.button();            this.btn_sub = new system.windows.forms.button();            this.btn_mul = new system.windows.forms.button();            this.btn_0 = new system.windows.forms.button();            this.btn_3 = new system.windows.forms.button();            this.btn_2 = new system.windows.forms.button();            this.btn_1 = new system.windows.forms.button();            this.btn_6 = new system.windows.forms.button();            this.btn_5 = new system.windows.forms.button();            this.btn_4 = new system.windows.forms.button();            this.btn_sqrt = new system.windows.forms.button();            this.btn_div = new system.windows.forms.button();            this.btn_7 = new system.windows.forms.button();            this.btn_8 = new system.windows.forms.button();            this.btn_9 = new system.windows.forms.button();            this.btn_sqr = new system.windows.forms.button();            this.mainmenu1 = new system.windows.forms.mainmenu();            this.menuitem1 = new system.windows.forms.menuitem();            this.menuitem2 = new system.windows.forms.menuitem();            this.menuitem3 = new system.windows.forms.menuitem();            this.menuitem4 = new system.windows.forms.menuitem();            this.menuitem5 = new system.windows.forms.menuitem();            this.menuitem6 = new system.windows.forms.menuitem();            this.menuitem8 = new system.windows.forms.menuitem();            this.menuitem9 = new system.windows.forms.menuitem();            this.menuitem10 = new system.windows.forms.menuitem();            this.groupbox1.suspendlayout();            this.suspendlayout();            //             // txtshow            //             this.txtshow.backcolor = system.drawing.color.fromargb(((system.byte)(192)), ((system.byte)(192)), ((system.byte)(255)));            this.txtshow.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.txtshow.forecolor = system.drawing.color.purple;            this.txtshow.location = new system.drawing.point(25, 8);            this.txtshow.name = "txtshow";            this.txtshow.size = new system.drawing.size(228, 23);            this.txtshow.tabindex = 1;            this.txtshow.text = "0.";            this.txtshow.textalign = system.windows.forms.horizontalalignment.right;            //             // groupbox1            //             this.groupbox1.controls.add(this.c);            this.groupbox1.controls.add(this.ce);            this.groupbox1.controls.add(this.btn_rev);            this.groupbox1.controls.add(this.btn_dot);            this.groupbox1.controls.add(this.btn_add);            this.groupbox1.controls.add(this.btn_equ);            this.groupbox1.controls.add(this.btn_sign);            this.groupbox1.controls.add(this.btn_sub);            this.groupbox1.controls.add(this.btn_mul);            this.groupbox1.controls.add(this.btn_0);            this.groupbox1.controls.add(this.btn_3);            this.groupbox1.controls.add(this.btn_2);            this.groupbox1.controls.add(this.btn_1);            this.groupbox1.controls.add(this.btn_6);            this.groupbox1.controls.add(this.btn_5);            this.groupbox1.controls.add(this.btn_4);            this.groupbox1.controls.add(this.btn_sqrt);            this.groupbox1.controls.add(this.btn_div);            this.groupbox1.controls.add(this.btn_7);            this.groupbox1.controls.add(this.btn_8);            this.groupbox1.controls.add(this.btn_9);            this.groupbox1.controls.add(this.btn_sqr);            this.groupbox1.location = new system.drawing.point(24, 40);            this.groupbox1.name = "groupbox1";            this.groupbox1.size = new system.drawing.size(232, 184);            this.groupbox1.tabindex = 21;            this.groupbox1.tabstop = false;            this.groupbox1.text = "安置机区";            //             // c            //             this.c.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.c.forecolor = system.drawing.color.red;            this.c.location = new system.drawing.point(178, 48);            this.c.name = "c";            this.c.size = new system.drawing.size(36, 61);            this.c.tabindex = 41;            this.c.text = "c";            this.c.click += new system.eventhandler(this.btn_oper);            //             // ce            //             this.ce.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.ce.forecolor = system.drawing.color.red;            this.ce.location = new system.drawing.point(138, 16);            this.ce.name = "ce";            this.ce.size = new system.drawing.size(76, 29);            this.ce.tabindex = 40;            this.ce.text = "ce";            this.ce.click += new system.eventhandler(this.btn_oper);            //             // btn_rev            //             this.btn_rev.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_rev.forecolor = system.drawing.color.blue;            this.btn_rev.location = new system.drawing.point(178, 112);            this.btn_rev.name = "btn_rev";            this.btn_rev.size = new system.drawing.size(36, 29);            this.btn_rev.tabindex = 39;            this.btn_rev.text = "1/x";            this.btn_rev.click += new system.eventhandler(this.btn_oper);            //             // btn_dot            //             this.btn_dot.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_dot.location = new system.drawing.point(98, 144);            this.btn_dot.name = "btn_dot";            this.btn_dot.size = new system.drawing.size(36, 29);            this.btn_dot.tabindex = 38;            this.btn_dot.tag = "0";            this.btn_dot.text = ".";            this.btn_dot.click += new system.eventhandler(this.btn_oper);            //             // btn_add            //             this.btn_add.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_add.forecolor = system.drawing.color.red;            this.btn_add.location = new system.drawing.point(138, 144);            this.btn_add.name = "btn_add";            this.btn_add.size = new system.drawing.size(36, 29);            this.btn_add.tabindex = 37;            this.btn_add.text = "+";            this.btn_add.click += new system.eventhandler(this.btn_oper);            //             // btn_equ            //             this.btn_equ.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_equ.forecolor = system.drawing.color.red;            this.btn_equ.location = new system.drawing.point(178, 144);            this.btn_equ.name = "btn_equ";            this.btn_equ.size = new system.drawing.size(36, 29);            this.btn_equ.tabindex = 36;            this.btn_equ.text = "=";            this.btn_equ.click += new system.eventhandler(this.btn_equ_click);            //             // btn_sign            //             this.btn_sign.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_sign.forecolor = system.drawing.color.blue;            this.btn_sign.location = new system.drawing.point(58, 144);            this.btn_sign.name = "btn_sign";            this.btn_sign.size = new system.drawing.size(36, 29);            this.btn_sign.tabindex = 35;            this.btn_sign.text = "+/-";            this.btn_sign.click += new system.eventhandler(this.btn_oper);            //             // btn_sub            //             this.btn_sub.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_sub.forecolor = system.drawing.color.red;            this.btn_sub.location = new system.drawing.point(138, 112);            this.btn_sub.name = "btn_sub";            this.btn_sub.size = new system.drawing.size(36, 29);            this.btn_sub.tabindex = 34;            this.btn_sub.text = "-";            this.btn_sub.click += new system.eventhandler(this.btn_oper);            //             // btn_mul            //             this.btn_mul.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_mul.forecolor = system.drawing.color.red;            this.btn_mul.location = new system.drawing.point(138, 80);            this.btn_mul.name = "btn_mul";            this.btn_mul.size = new system.drawing.size(36, 29);            this.btn_mul.tabindex = 33;            this.btn_mul.text = "*";            this.btn_mul.click += new system.eventhandler(this.btn_oper);            //             // btn_0            //             this.btn_0.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_0.forecolor = system.drawing.color.blue;            this.btn_0.location = new system.drawing.point(18, 144);            this.btn_0.name = "btn_0";            this.btn_0.size = new system.drawing.size(36, 29);            this.btn_0.tabindex = 32;            this.btn_0.tag = "0";            this.btn_0.text = "0";            this.btn_0.click += new system.eventhandler(this.btn_0_click);            //             // btn_3            //             this.btn_3.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_3.forecolor = system.drawing.color.blue;            this.btn_3.location = new system.drawing.point(98, 112);            this.btn_3.name = "btn_3";            this.btn_3.size = new system.drawing.size(36, 29);            this.btn_3.tabindex = 31;            this.btn_3.tag = "3";            this.btn_3.text = "3";            this.btn_3.click += new system.eventhandler(this.btn_0_click);            //             // btn_2            //             this.btn_2.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_2.forecolor = system.drawing.color.blue;            this.btn_2.location = new system.drawing.point(58, 112);            this.btn_2.name = "btn_2";            this.btn_2.size = new system.drawing.size(36, 29);            this.btn_2.tabindex = 30;            this.btn_2.tag = "2";            this.btn_2.text = "2";            this.btn_2.click += new system.eventhandler(this.btn_0_click);            //             // btn_1            //             this.btn_1.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_1.forecolor = system.drawing.color.blue;            this.btn_1.location = new system.drawing.point(18, 112);            this.btn_1.name = "btn_1";            this.btn_1.size = new system.drawing.size(36, 29);            this.btn_1.tabindex = 29;            this.btn_1.tag = "1";            this.btn_1.text = "1";            this.btn_1.click += new system.eventhandler(this.btn_0_click);            //             // btn_6            //             this.btn_6.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_6.forecolor = system.drawing.color.blue;            this.btn_6.location = new system.drawing.point(98, 80);            this.btn_6.name = "btn_6";            this.btn_6.size = new system.drawing.size(36, 29);            this.btn_6.tabindex = 28;            this.btn_6.tag = "6";            this.btn_6.text = "6";            this.btn_6.click += new system.eventhandler(this.btn_0_click);            //             // btn_5            //             this.btn_5.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_5.forecolor = system.drawing.color.blue;            this.btn_5.location = new system.drawing.point(58, 80);            this.btn_5.name = "btn_5";            this.btn_5.size = new system.drawing.size(36, 29);            this.btn_5.tabindex = 27;            this.btn_5.tag = "5";            this.btn_5.text = "5";            this.btn_5.click += new system.eventhandler(this.btn_0_click);            //             // btn_4            //             this.btn_4.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_4.forecolor = system.drawing.color.blue;            this.btn_4.location = new system.drawing.point(18, 80);            this.btn_4.name = "btn_4";            this.btn_4.size = new system.drawing.size(36, 29);            this.btn_4.tabindex = 26;            this.btn_4.tag = "4";            this.btn_4.text = "4";            this.btn_4.click += new system.eventhandler(this.btn_0_click);            //             // btn_sqrt            //             this.btn_sqrt.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_sqrt.forecolor = system.drawing.color.blue;            this.btn_sqrt.location = new system.drawing.point(18, 16);            this.btn_sqrt.name = "btn_sqrt";            this.btn_sqrt.size = new system.drawing.size(76, 29);            this.btn_sqrt.tabindex = 25;            this.btn_sqrt.text = "sqrt";            this.btn_sqrt.click += new system.eventhandler(this.btn_oper);            //             // btn_div            //             this.btn_div.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_div.forecolor = system.drawing.color.red;            this.btn_div.location = new system.drawing.point(138, 48);            this.btn_div.name = "btn_div";            this.btn_div.size = new system.drawing.size(36, 29);            this.btn_div.tabindex = 24;            this.btn_div.text = "/";            this.btn_div.click += new system.eventhandler(this.btn_oper);            //             // btn_7            //             this.btn_7.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_7.forecolor = system.drawing.color.blue;            this.btn_7.location = new system.drawing.point(18, 48);            this.btn_7.name = "btn_7";            this.btn_7.size = new system.drawing.size(36, 29);            this.btn_7.tabindex = 23;            this.btn_7.tag = "7";            this.btn_7.text = "7";            this.btn_7.click += new system.eventhandler(this.btn_0_click);            //             // btn_8            //             this.btn_8.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_8.forecolor = system.drawing.color.blue;            this.btn_8.location = new system.drawing.point(58, 48);            this.btn_8.name = "btn_8";            this.btn_8.size = new system.drawing.size(36, 29);            this.btn_8.tabindex = 22;            this.btn_8.tag = "8";            this.btn_8.text = "8";            this.btn_8.click += new system.eventhandler(this.btn_0_click);            //             // btn_9            //             this.btn_9.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_9.forecolor = system.drawing.color.blue;            this.btn_9.location = new system.drawing.point(98, 48);            this.btn_9.name = "btn_9";            this.btn_9.size = new system.drawing.size(36, 29);            this.btn_9.tabindex = 21;            this.btn_9.tag = "9";            this.btn_9.text = "9";            this.btn_9.click += new system.eventhandler(this.btn_0_click);            //             // btn_sqr            //             this.btn_sqr.font = new system.drawing.font("宋体", 10.5f, system.drawing.fontstyle.bold, system.drawing.graphicsunit.point, ((system.byte)(134)));            this.btn_sqr.forecolor = system.drawing.color.blue;            this.btn_sqr.location = new system.drawing.point(98, 16);            this.btn_sqr.name = "btn_sqr";            this.btn_sqr.size = new system.drawing.size(36, 29);            this.btn_sqr.tabindex = 19;            this.btn_sqr.text = "sqr";            this.btn_sqr.click += new system.eventhandler(this.btn_oper);            //             // mainmenu1            //             this.mainmenu1.menuitems.addrange(new system.windows.forms.menuitem[] {                                                                                      this.menuitem8,                                                                                      this.menuitem1,                                                                                      this.menuitem4});            //             // menuitem1            //             this.menuitem1.index = 1;            this.menuitem1.menuitems.addrange(new system.windows.forms.menuitem[] {                                                                                      this.menuitem2,                                                                                      this.menuitem3});            this.menuitem1.text = "编辑(&e)";            //             // menuitem2            //             this.menuitem2.index = 0;            this.menuitem2.text = "复制(&c)";            this.menuitem2.click += new system.eventhandler(this.menuitem2_click);            //             // menuitem3            //             this.menuitem3.index = 1;            this.menuitem3.text = "粘贴(&p)";            this.menuitem3.click += new system.eventhandler(this.menuitem3_click);            //             // menuitem4            //             this.menuitem4.index = 2;            this.menuitem4.menuitems.addrange(new system.windows.forms.menuitem[] {                                                                                      this.menuitem5,                                                                                      this.menuitem6});            this.menuitem4.text = "辅助(&h)";            //             // menuitem5            //             this.menuitem5.index = 0;            this.menuitem5.text = "辅助重心(&h)";            this.menuitem5.click += new system.eventhandler(this.menuitem5_click);            //             // menuitem6            //             this.menuitem6.index = 1;            this.menuitem6.text = "对于(&a)";            this.menuitem6.click += new system.eventhandler(this.menuitem6_click);            //             // menuitem8            //             this.menuitem8.index = 0;            this.menuitem8.menuitems.addrange(new system.windows.forms.menuitem[] {                                                                                      this.menuitem9,                                                                                      this.menuitem10});            this.menuitem8.text = "文件(&f)";            //             // menuitem9            //             this.menuitem9.index = 0;            this.menuitem9.text = "翻开windows安置器(&o)";            this.menuitem9.click += new system.eventhandler(this.menuitem9_click);            //             // menuitem10            //             this.menuitem10.index = 1;            this.menuitem10.text = "退出(&q)";            this.menuitem10.click += new system.eventhandler(this.menuitem10_click);            //             // form1            //             this.autoscalebasesize = new system.drawing.size(6, 14);            this.clientsize = new system.drawing.size(278, 239);            this.controls.add(this.groupbox1);            this.controls.add(this.txtshow);            this.formborderstyle = system.windows.forms.formborderstyle.fixed3d;            this.icon = ((system.drawing.icon)(resources.getobject("$this.icon")));            this.maximizebox = false;            this.menu = this.mainmenu1;            this.name = "form1";            this.startposition = system.windows.forms.formstartposition.centerscreen;            this.text = "安置器";            this.groupbox1.resumelayout(false);            this.resumelayout(false);        }        #endregion        #region 各变量和常数的表明        public const int null = 0;      // 树立安排码        public const int add = 1;     //表露加        public const int sub = 2;     //减        public const int mul = 3;     //乘        public const int div = 4;    //除        public const int sqr = 5;    //求平方        public const int sqrt = 6;   //求平方根        public const int nodot  = 0;     // 树立是否点击了小批点,0 为没点        public const int hasdot = 1;        private double res = 0;         // 记录截至数        private double tmp = 0;         // 姑且输入的安排数        private int opt = null;         // 记录安排码        private int dot = nodot;    // 记录是否点击了小批点,0为没有点        private int num = 0;        // 记录输入安排数的个数        private int dotnum = 0;        // 记录小批点限制的个数                string stroper;            //赢得安排符        #endregion        /// <summary>        /// 应用步伐的主入口点。        /// </summary>        [stathread]        static void main()         {            application.run(new form1());        }        /// <summary>                #region 赢得安排数事故        //赢得安排数事故                private void btn_0_click(object sender, system.eventargs e)        {            system.windows.forms.button btntmp;            double i;            btntmp = sender as system.windows.forms.button;                        if (btntmp != null)            {                if (dot == nodot)                {                    // 没有点击小批点                    i = double.parse(btntmp.tag.tostring()); //取用户自树立的控件联系数,并变幻成double型                    tmp = tmp * 10 + i;                    txtshow.text = tmp.tostring();   //将其放入文本表白屏啊                }                else   // 点击了小批点                {                                        dotnum++;    //记录小批点限制的个数                                                       // 天才小批限制的新的数值                    i = double.parse(btntmp.tag.tostring()) / system.math.pow(10,dotnum);                    tmp = tmp + i;  //将小批点后的值加到姑且操做数                    txtshow.text = tmp.tostring();                }            }        }        #endregion        #region 即是事故和即是验算本事        //即是事故        private void btn_equ_click(object sender, system.eventargs e)        {            calc();        }        //即是验算本事        private void calc()        {            // 天才截至            if (num == 0 )    //是否有安排数,没有就返来0            {                res = 0;                tmp = 0;                txtshow.text = res.tostring();                return;            }            switch (opt)  //找到对应的验算符进行安置            {                    // 减法                case add:                    res = res + tmp;                                        break;                    // 减法                case sub:                    res = res - tmp;                                        break;                    // 乘法                case mul:                    res = res * tmp;                                        break;                    // 除法                case div:                    res = res / tmp;                                        break;                    // 平方                case sqr:                    res = tmp * tmp;                                        break;                    // 平方根                case sqrt:                    res = system.math.sqrt(tmp);                                        break;                default:                    return;            }            txtshow.text = res.tostring();   //截至输出到文本表白屏            opt = null;  //验算符清空            tmp=0;                dot = nodot;                    //res = 0;                    //num = 0;        }        #endregion        #region 赢得安排符运事故        //赢得安排符运事故        private void btn_oper(object obj,eventargs ea)        {            button tmp1=(button)obj;            stroper=tmp1.text;            switch (stroper)            {                case "/":       //除法验算                    if(opt!=null&&opt!=div)                    {                        calc();                    }                    opt = div;                    if (num != 0)  //决定安排数的个数,纵然两个就做二元验算                    {                        if (tmp != 0)                            res = res / tmp;                    }                    else                        res = tmp;                    num++;                                          tmp = 0;                    txtshow.text = res.tostring();                    dot = nodot;                    break;                case "*":                    // 乘法验算                    if(opt!=null&&opt!=mul)                    {                        calc();                    }                    opt = mul;                                        if (num!= 0 )     //决定安排数的个数,纵然两个就做二元验算                        {                            if(tmp!=0)                         res = res * tmp;                    }                    else                        res = tmp;                                        num++;                                                          tmp = 0;                    txtshow.text = res.tostring();                    dot = nodot;                    break;                case "+":            //减法验算                    if(opt!=null&&opt!=add)                    {                        calc();                    }                    opt = add;                    if (num != 0)    //决定安排数的个数,纵然两个就做二元验算                        res = res + tmp;                    else                        res = tmp;                    num++;                                        tmp = 0;                    txtshow.text = res.tostring();                    dot = nodot;                    break;                case "-":        //减法验算                    if(opt!=null&&opt!=sub)                    {                        calc();                    }                    /*if(opt==add)                    {                        res=res+tmp;                        tmp=0;                    }*/                    opt = sub;                    if (num != 0)    //决定安排数的个数,纵然两个就做二元验算                        res = res - tmp;                    else                        res = tmp;                    num++;                                         tmp = 0;                    txtshow.text = res.tostring();                    dot = nodot;                    break;                case "sqrt":     //平方根验算                    if(opt!=null)                    {                        calc();                    }                    //opt=sqrt;                    if (tmp > 0)  //要求安排数大于0                    {                        res = math.sqrt(tmp);                        //res=tmp;                    }                    else if(res>0)                        res= math.sqrt(res);                        txtshow.text =res.tostring();                    num++;                        tmp=0;                    dot = nodot;                    break;                case "sqr":                    // 平方验算                    if(opt!=null)                    {                        calc();                    }                    //opt=sqr;                    if (tmp != 0)                    {                        res = tmp * tmp;                        //res=tmp;                    }                    else                        res=res*res;                                        txtshow.text = res.tostring();                    num++;                        tmp=0;                    dot = nodot;                    break;                case "1/x":  //倒数验算                    if(opt!=null)                    {                        calc();                    }                    if (tmp != 0)                    {                        res = 1 / tmp;                        //res=tmp;                    }                    else                                        res=1/res;                    txtshow.text = res.tostring();                    tmp=0;                    dot = nodot;                    break;                case ".":                            // 点击了小批点                    if(dot==hasdot)                        return;                    else                    {                        dot = hasdot;                        dotnum = 0;                    }                                        break;                case "+/-":                                // 点击了标志验算                    if(tmp!=0)                    {                        tmp = -tmp;                        txtshow.text = tmp.tostring();                    }                    else                    {                        res=-res;                        //res=tmp;                        txtshow.text = res.tostring();                        }                    dot = nodot;                    break;                    case "ce":     //废黜验算                    res = 0;         // 记录截至数                    tmp = 0;         // 姑且输入的安排数                    opt = null;         // 记录安排码                    dot = nodot;    // 记录是否点击了小批点                    num = 0;        // 记录输入安排数的个数                    dotnum = 0;        // 记录小批点限制的个数                    txtshow.text="";                                        break;                case "c":         //废黜验算                    res = 0;         // 记录截至数                    tmp = 0;         // 姑且输入的安排数                    opt = null;         // 记录安排码                    dot = nodot;    // 记录是否点击了小批点                    num = 0;        // 记录输入安排数的个数                    dotnum = 0;        // 记录小批点限制的个数                    txtshow.text="";                    break;            }        }        #endregion        #region     主菜单事故        //翻开对于重心---调用windows xp中计算器的辅助        private void menuitem5_click(object sender, system.eventargs e)        {            help.showhelp(this,"c:\\windows\\help\\calc.chm");                }                //翻开于我们        private void menuitem6_click(object sender, system.eventargs e)        {            form2 fm=new form2();            fm.show();                    }        //复制        private void menuitem2_click(object sender, system.eventargs e)        {            if(txtshow.selectionlength>0)            {                txtshow.copy();            }        }        //       //粘贴        private void menuitem3_click(object sender, system.eventargs e)        {            txtshow.paste();        }                 //调用windows xp中的安置器        private void menuitem9_click(object sender, system.eventargs e)        {             help.showhelp(this,"c:\\windows\\system32\\calc.exe");        }        //退出        private void menuitem10_click(object sender, system.eventargs e)        {            application.exit();        }        #endregion            }}