WinForm Calculator Two-step walk

namespace windowsformsapplication4{public partial class Form2:form {public Form2 () {in        Itializecomponent ();        }//Record whether the operator has just been ordered private bool isOK = true;        Record result private decimal Sum;        Records the last operator of the private string Preyunsuanfu;        Record expression private string Biaodashi; private void Form2_load (object sender, EventArgs e) {} private void Btnling_click (object sender, Eve Ntargs e) {if (isOK) {Txtshuru.               Text = "0";            isOK = false; } else {Txtshuru.            Text + = "0";                }} private void Btnyi_click (object sender, EventArgs e) {if (isOK) { Txtshuru.                Text = "1";            isOK = false; } else {Txtshuru.            Text + = "1"; }} private void Btner_click(object sender, EventArgs e) {if (isOK) {Txtshuru.                Text = "2";            isOK = false; } else {Txtshuru.            Text + = "2";                }} private void Btnsan_click (object sender, EventArgs e) {if (isOK) { Txtshuru.                Text = "3";            isOK = false; } else {Txtshuru.            Text + = "3";                }} private void Btnsi_click (object sender, EventArgs e) {if (isOK) { Txtshuru.                Text = "4";            isOK = false; } else {Txtshuru.            Text + = "4";                }} private void Btnwu_click (object sender, EventArgs e) {if (isOK) { Txtshuru.                Text = "5";            isOK = false;             } else {   Txtshuru.            Text + = "5";                }} private void Btnliu_click (object sender, EventArgs e) {if (isOK) { Txtshuru.                Text = "6";            isOK = false; } else {Txtshuru.            Text + = "6";                }} private void Btnqi_click (object sender, EventArgs e) {if (isOK) { Txtshuru.                Text = "7";            isOK = false; } else {Txtshuru.            Text + = "7";                }} private void Btnba_click (object sender, EventArgs e) {if (isOK) { Txtshuru.                Text = "8";            isOK = false; } else {Txtshuru.            Text + = "8";                }} private void Btnjiu_click (object sender, EventArgs e) {if (isOK) { Txtshuru.      Text = "9";          isOK = false; } else {Txtshuru.            Text + = "9";            }} private void Btnjia_click (object sender, EventArgs e) {if (Preyunsuanfu = = null) {Sum = decimal. Parse (Txtshuru.                Text); Biaodashi = Txtshuru.            Text;                    } else {if (!isok) {if (Preyunsuanfu = = "+") {sum = sum + decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "-") {Sum = Sum-decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "*") {sum = sum * decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "/") {Sum = Sum/decimal. Parse (Txtshuru. TEXT); } if (Preyunsuanfu = = "%") {sum = sum% decimal. Parse (Txtshuru.                    Text); } Biaodashi = Biaodashi + Preyunsuanfu + Txtshuru.                Text; }} Txtjisuanshi.            Text = Biaodashi + "+";            Preyunsuanfu = "+";            isOK = true; Txtshuru.        Text = Sum.tostring ();                 private void Btnjian_click (object sender, EventArgs e) {if (Preyunsuanfu = = null) { Sum = Decimal. Parse (Txtshuru.                Text); Biaodashi = Txtshuru.            Text;                    } else {if (!isok) {if (Preyunsuanfu = = "+") {sum = sum + decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "-") {Sum = Sum-decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "*") {sum = sum * decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "/") {Sum = Sum/decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "%") {sum = sum% decimal. Parse (Txtshuru.                    Text); } Biaodashi = Biaodashi + Preyunsuanfu + Txtshuru.                Text; }} Txtjisuanshi.            Text = Biaodashi + "-";            Preyunsuanfu = "-";            isOK = true; Txtshuru.        Text = Sum.tostring ();            private void Btncheng_click (object sender, EventArgs e) {if (Preyunsuanfu = = null) {Sum = decimal. Parse (Txtshuru.                Text); Biaodashi = Txtshuru.            Text;         } else   {if (!isok) {if (Preyunsuanfu = = "+") { sum = sum + decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "-") {Sum = Sum-decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "*") {sum = sum * decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "/") {Sum = Sum/decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "%") {sum = sum% decimal. Parse (Txtshuru.                    Text); } Biaodashi = Biaodashi + Preyunsuanfu + Txtshuru.                Text; }} Txtjisuanshi.            Text = Biaodashi + "*";            Preyunsuanfu = "*"; isOK = true; Txtshuru.        Text = Sum.tostring ();                private void Btnchu_click (object sender, EventArgs e) {if (Preyunsuanfu = = null) { Sum = Decimal. Parse (Txtshuru.                Text); Biaodashi = Txtshuru.            Text;                    } else {if (!isok) {if (Preyunsuanfu = = "+") {sum = sum + decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "-") {Sum = Sum-decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "*") {sum = sum * decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "/") {Sum = Sum/decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu == "%") {sum = sum% decimal. Parse (Txtshuru.                    Text); } Biaodashi = Biaodashi + Preyunsuanfu + Txtshuru.                Text; }} Txtjisuanshi.            Text = Biaodashi + "/";            Preyunsuanfu = "/";            isOK = true; Txtshuru.        Text = Sum.tostring ();                private void Btnmo_click (object sender, EventArgs e) {if (Preyunsuanfu = = null) { Sum = Decimal. Parse (Txtshuru.                Text); Biaodashi = Txtshuru.            Text;                    } else {if (!isok) {if (Preyunsuanfu = = "+") {sum = sum + decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "-") {Sum = Sum-decimal. Parse (Txtshuru.                    Text); } if (PreyunSuanfu = = "*") {sum = sum * decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "/") {Sum = Sum/decimal. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "%") {sum = sum% decimal. Parse (Txtshuru.                    Text); } Biaodashi = Biaodashi + Preyunsuanfu + Txtshuru.                Text; }} Txtjisuanshi.            Text = Biaodashi + "%";            Preyunsuanfu = "%";            isOK = true; Txtshuru.        Text = Sum.tostring (); The private void Btnclear_click (object sender, EventArgs e) {Txtshuru.            Text = "0"; Txtjisuanshi.            Text = "";            isOK = true;            Preyunsuanfu = null;            Sum = 0;        Biaodashi = "";   private void Btnchexiao_click (object sender, EventArgs e)     {if (!isok) {if (Txtshuru. Text.length = = 1) {Txtshuru.                    Text = "0";                isOK = true; } else {Txtshuru. Text = Txtshuru. Text.substring (0, Txtshuru.                TEXT.LENGTH-1); }}} private void Btndian_click (object sender, EventArgs e) {if (Txtshuru. Text = = "0") {Txtshuru.            Text = "0."; } if (!isok &&!txtshuru.            Text.contains (".")) {Txtshuru.            Text + = ".";        } isOK = false; The private void Btndeng_click (object sender, EventArgs e) {Txtjisuanshi.            Text = ""; if (Preyunsuanfu = = "+") {sum = sum + decimal. Parse (Txtshuru.            Text); } if (Preyunsuanfu = = "-") {Sum = Sum-decimal.Parse (Txtshuru.            Text); } if (Preyunsuanfu = = "*") {sum = sum * decimal. Parse (Txtshuru.            Text); } if (Preyunsuanfu = = "/") {Sum = Sum/decimal. Parse (Txtshuru.            Text); } if (Preyunsuanfu = = "%") {sum = sum% decimal. Parse (Txtshuru.            Text); } Txtshuru.            Text = Sum.tostring ();            isOK = true;            Biaodashi = "";            Sum = 0;        Preyunsuanfu = null;                private void Btnzhengfu_click (object sender, EventArgs e) {if (!isok) { if (decimal. Parse (Txtshuru. Text) > 0) {Txtshuru. Text = "-" + Txtshuru.                Text; } else {Txtshuru. Text = Txtshuru.                Text.substring (1); }            }        }    }}

　　

The button event

namespace firstform{public partial class Jisuanqi:form {public Jisuanqi () {Initializec        Omponent (); The private double sum=0;//records the result of the previous step, the private string biaodashi;//the formula before the click operator private String Preyunsuanfu        ///the operator before storing private bool isOK = true;//used to determine whether the operator has just been ordered private void Btnling_click (object sender, EventArgs e)            {button btn = (button) sender; if (isOK) {Txtshuru. Text = btn.                Text;            isOK = false; } else {Txtshuru. Text + = btn.            Text;            }} private void Btnjia_click (object sender, EventArgs e) {button btn = (button) sender; String Yunsuanfu = btn.            Text; if (Preyunsuanfu = = null) {Biaodashi + = Txtshuru.                Text; sum = Double. Parse (Txtshuru.            Text); } else {if (!iSok) {if (Preyunsuanfu = = "+") {sum + = Doubl E.parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "-") {sum-= double. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "*") {sum *= double. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "/") {sum/= double. Parse (Txtshuru.                    Text); } if (Preyunsuanfu = = "%") {sum%= double. Parse (Txtshuru.                    Text); } Biaodashi = biaodashi+ Preyunsuanfu + Txtshuru.                    Text; Txtshuru. Text = Sum.                ToString (); }} Txtjisuanshi.            Text = Biaodashi + Yunsuanfu;         Preyunsuanfu = Yunsuanfu;   isOK = true; }      }}

　　

WinForm Calculator Two-step walk