using
System;using
System.Collections.Generic;using
System.ComponentModel;using
System.Data;using
System.Drawing;using
System.Text;using
System.Windows.Forms;namespace
WindowsApplication1{
public partial class Form1 : Form{
bool key=true ; byte op; int num1; public Form1(){
InitializeComponent();
}
private void Form1_Load( sender, EventArgs e){
}
private void button1_Click( sender, EventArgs e){
}
private void button2_Click( sender, EventArgs e){
}
private void button1_Click_1( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"1"; else{
textBox1.Clear();
textBox1.Text =
"1";key =
true;}
}
private void button13_Click( sender, EventArgs e){
key =
false;op = 1;
num1 =
Convert.ToInt16(textBox1.Text);}
private void button12_Click( sender, EventArgs e){
int num3; int num2 = Convert.ToInt16 (textBox1.Text); switch (op){
case 1:num3=num1+num2;
textBox1.Text = num3.ToString();
break; case 2:num3 = num1 - num2;
textBox1.Text = num3.ToString();
break; case 3:num3 = num1 * num2;
textBox1.Text = num3.ToString();
break; case 4:num3 = num1 / num2;
textBox1.Text = num3.ToString();
break;}
}
private void button2_Click_1( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"2"; else{
textBox1.Clear();
textBox1.Text =
"2";key =
true;}
}
private void button3_Click( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"3"; else{
textBox1.Clear();
textBox1.Text =
"3";key =
true;}
}
private void button4_Click( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"4"; else{
textBox1.Clear();
textBox1.Text =
"4";key =
true;}
}
private void button5_Click( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"5"; else{
textBox1.Clear();
textBox1.Text =
"5";key =
true;}
}
private void button6_Click( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"6"; else{
textBox1.Clear();
textBox1.Text =
"6";key =
true;}
}
private void button7_Click( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"7"; else{
textBox1.Clear();
textBox1.Text =
"7";key =
true;}
}
private void button8_Click( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"8"; else{
textBox1.Clear();
textBox1.Text =
"8";key =
true;}
}
private void button9_Click( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"9"; else{
textBox1.Clear();
textBox1.Text =
"9";key =
true;}
}
private void button10_Click( sender, EventArgs e){
if (key)textBox1.Text = textBox1.Text +
"0"; else{
textBox1.Clear();
textBox1.Text =
"0";key =
true;}
}
private void button14_Click( sender, EventArgs e){
key =
false;op = 2;
num1 =
Convert.ToInt16(textBox1.Text);}
private void button15_Click( sender, EventArgs e){
key =
false;op = 3;
num1 =
Convert.ToInt16(textBox1.Text);}
private void button16_Click( sender, EventArgs e){
key =
false;op = 4;
num1 =
Convert.ToInt16(textBox1.Text);}
}
}
