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本例创建一个简易计算器,能进行加减乘除的计算,程序界面如下图所示。 程序代码如下。 using System.Collections.Generic; using System.Drawing; using System.Windows.Forms; namespace eg43_addCtrlAtRuntimeApp { public partial class Calculator1 : Form { private int opMain=0; private double mainNum1=0; private double mainNum2=0; private bool isSecond=false; private bool isDone=false; private bool isDecimal=false; public Calculator1() { InitializeComponent(); } void Calculator1KeyDown(object sender, KeyEventArgs e) { filterKeys(e.KeyValue); } void Btn1Click(object sender, EventArgs e) { setText("1"); } void Btn2Click(object sender, EventArgs e) { setText("2"); } void Btn3Click(object sender, EventArgs e) { setText("3"); } void Btn4Click(object sender, EventArgs e) { setText("4"); } void Btn5Click(object sender, EventArgs e) { setText("5"); } void Btn6Click(object sender, EventArgs e) { setText("6"); } void Btn7Click(object sender, EventArgs e) { setText("7"); } void Btn8Click(object sender, EventArgs e) { setText("8"); } void Btn9Click(object sender, EventArgs e) { setText("9"); } void Btn0Click(object sender, EventArgs e) { setText("0"); } void BtnAddClick(object sender, EventArgs e) { setOperator(1); } void BtnSubtractClick(object sender, EventArgs e) { setOperator(2); } void BtnMultiplyClick(object sender, EventArgs e) { setOperator(3); } void BtnDivideClick(object sender, EventArgs e) { setOperator(4); } void BtnClearClick(object sender, EventArgs e) { isSecond=false; setText("clear"); } void BtnNegativeClick(object sender, EventArgs e) { changeSign(); } void BtnDecimalClick(object sender, EventArgs e) { setDecimal(); } void BtnEqualsClick(object sender, EventArgs e) { doEquals(); } public void setText(string textset) { if(textset.Equals("clear")) { txtResult.Text=""; isDone=false; isSecond=false; isDecimal=false; } else { if(isSecond) { txtResult.Text=textset; isSecond=false; isDecimal=false; } else { if(isDone) { txtResult.Text=textset; isDone=false; } else { txtResult.Text+=textset; } } } btnEquals.Select(); } public void Calc(double num1,double num2,int op) { double answer=0; switch(op) { case 1: answer=num1+num2; break; case 2: answer=num1-num2; break; case 3: answer=num1*num2; break; case 4: answer=num1/num2; break; } setText(answer.ToString()); } private void doEquals() { mainNum2=double.Parse(txtResult.Text); setText("clear"); Calc(mainNum1,mainNum2,opMain); isDone=true; } private void changeSign() { double storNum; if(txtResult.Text.Length>0) { storNum=double.Parse(txtResult.Text); storNum*=-1; txtResult.Text=storNum.ToString(); } btnEquals.Select(); } private void setOperator(int operation) { if(txtResult.Text.Length>0) { opMain=operation; mainNum1=double.Parse(txtResult.Text); isSecond=true; isDone=false; btnEquals.Select(); } } private void setDecimal() { if(!isDecimal) { setText("."); isDecimal=true; } btnEquals.Select(); } public void filterKeys(int keyCode) { switch(keyCode) { case 96: setText("0"); break; case 97: setText("1"); break; case 98: setText("2"); break; case 99: setText("3"); break; case 100: setText("4"); break; case 101: setText("5"); break; case 102: setText("6"); break; case 103: setText("7"); break; case 104: setText("8"); break; case 105: setText("9"); break; case 67: setText("clear"); break; case 107: setOperator(1); break; case 109: setOperator(2); break; case 106: setOperator(3); break; case 111: setOperator(4); break; case 110: setDecimal(); break; } } } } |
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