计算器如何用c＃设置位数

计算器如何用c＃设置位数

简单的计算器的代码如下：

{
int fristnum = Convert.ToInt32(this.textBox1.Text);
string choose = this.textBox3.Text;
int secondnum = Convert.ToInt32(this.textBox2.Text);
int sum=0;
switch (choose)
{
case "+":
sum = fristnum + secondnum;
this.textBox4.Text = sum.ToString();
break;
case "-":
sum = fristnum - secondnum;
this.textBox4.Text = sum.ToString();
break;
case "*":
sum = fristnum * secondnum;
this.textBox4.Text = sum.ToString();
break;
case "/":
sum = fristnum / secondnum;
this.textBox4.Text = sum.ToString();
break;
default :
this.textBox4.Text = "无法识别的远算符!";
break;
}

}
catch
{
MessageBox.Show("输入有误!");
}
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