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お二方ありがとうございます
ほんとにプログラム初心者で右も左もわからないので感謝です
今はこんな状態です
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public partial class Form1: Form
{
public Form1()
{
InitializeComponent();
}
bool isFirst = true;
decimal x = 0;
private void buttonNumber_Click(object sender, EventArgs e)
{
if (key != Operator.undefined && isFirst)
{
x = Convert.ToDecimal(textBox1.Text);
textBox1.Text = "";
isFirst = false;
}
String text = textBox1.Text + ((Button)sender).Text;
decimal d = Convert.ToDecimal(text);
String text2 = d.ToString();
textBox1.Text = text2;
}
private void buttonClear_Click(object sender, EventArgs e)
{
textBox1.Text = "";
}
private void buttonDot_Click(object sender, EventArgs e)
{
if (textBox1.Text.IndexOf(".") >= 0)
{
return;
}
textBox1.Text = textBox1.Text + ".";
}
enum Operator
{
undefined, add, sub, mul, dvi
};
Operator key = Operator.undefined;
private void buttonAdd_Click(object sender, EventArgs e)
{
key= Operator.add;
isFirst = true;
}
private void buttonSub_Click(object sender, EventArgs e)
{
key=Operator.sub;
isFirst = true;
}
private void buttonMul_Click(object sender, EventArgs e)
{
key= Operator.mul;
isFirst = true;
}
private void buttonDvi_Click(object sender, EventArgs e)
{
key= Operator.dvi;
isFirst = true;
}
private void buttonResult_Click(object sender, EventArgs e)
{
decimal y = Convert.ToDecimal(textBox1.Text);
decimal results = 0;
switch (key)
{
case Operator.add:
results = x + y;
break;
case Operator.sub:
results = x - y;
break;
case Operator.mul:
results = x * y;
break;
case Operator.dvi:
results = x / y;
break;
}
textBox1.Text = results.ToString();
}
}
}
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