using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
String firstNumber;
String secondNumber;
String operation;
public Form1()
{
InitializeComponent();
firstNumber = "0";
secondNumber = "0";
operation = "";
textBox1.Text = "";
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button13_Click(object sender, EventArgs e)
{
operation = "";
firstNumber = "";
secondNumber = "";
textBox1.Text = "";
}
private void button10_Click(object sender, EventArgs e)
{
firstNumber = textBox1.Text;
textBox1.Text = "";
operation = "+";
}
private void button11_Click(object sender, EventArgs e)
{
firstNumber = textBox1.Text;
textBox1.Text = "";
operation = "-";
}
private void button12_Click(object sender, EventArgs e)
{
secondNumber = textBox1.Text;
switch (operation)
{
case "+":
textBox1.Text = System.String.Format("{0}", int.Parse(firstNumber) + int.Parse(secondNumber));
break;
case "-":
textBox1.Text = System.String.Format("{0}", int.Parse(firstNumber) - int.Parse(secondNumber));
break;
case "*":
textBox1.Text = System.String.Format("{0}", int.Parse(firstNumber) * int.Parse(secondNumber));
break;
case "/":
if (int.Parse(secondNumber) == 0)
{
textBox1.Text = "除數不可為0";
}
if (int.Parse(secondNumber) != 0)
{
textBox1.Text = System.String.Format("{0}", int.Parse(firstNumber) / int.Parse(secondNumber));
}
break;
case " Math.Sqrt":
textBox1.Text = System.String.Format("{0}", Math.Sqrt(int.Parse(firstNumber)));
break;
default:
break;
}
firstNumber = "0";
secondNumber = "0";
operation = "";
}
private void button1_Click(object sender, EventArgs e)
{
textBox1.Text += "1";
}
private void button2_Click(object sender, EventArgs e)
{
textBox1.Text += "2";
}
private void button3_Click(object sender, EventArgs e)
{
textBox1.Text += "3";
}
private void button4_Click(object sender, EventArgs e)
{
textBox1.Text += "4";
}
private void button5_Click(object sender, EventArgs e)
{
textBox1.Text += "5";
}
private void button6_Click(object sender, EventArgs e)
{
textBox1.Text += "6";
}
private void button7_Click(object sender, EventArgs e)
{
textBox1.Text += "7";
}
private void button8_Click(object sender, EventArgs e)
{
textBox1.Text += "8";
}
private void button9_Click(object sender, EventArgs e)
{
textBox1.Text += "9";
}
private void button14_Click(object sender, EventArgs e)
{
textBox1.Text += "0";
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button15_Click(object sender, EventArgs e)
{
firstNumber = textBox1.Text;
textBox1.Text = "";
operation = "*";
}
private void button16_Click(object sender, EventArgs e)
{
firstNumber = textBox1.Text;
textBox1.Text = "";
operation = "/";
}
private void button17_Click(object sender, EventArgs e)
{
firstNumber = textBox1.Text;
textBox1.Text = "";
operation = " Math.Sqrt";
}
}
}
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