关于计算器连加中的一个问题
string num_First = null;//第一个数
string num_Second = null;//第二个数
string num_Result = null;//结果
string num_Circle = null;//循环运算
string symbol_Variable="0";//记录符号
bool mode_Operation = true;//判断运算是否结束
bool mode_Error = false;//判断是否出现运算错误
bool mode_New = true;//判断是否需要输入新的数字
private void method_But_Num(string num)//数字键的方法
{
if (textBox1.Text == "0" || mode_Operation == true|| mode_Error == true || mode_New == true)
{
textBox1.Text = "";
num_Circle = null;
}
textBox1.Text += num;
mode_Operation = false;
mode_Error = false;
mode_New = false;
}
private void method_But_Symbol(string M)//运算符按键方法,为按键和方法提供一个接口
{
if (mode_Error == true)
{
textBox1.Text = "0";
mode_Error = false;
}
else if (num_First == null)
{
num_First = textBox1.Text;
mode_New = true;
}
else
{
if (num_Second == null && mode_New == true) { }
else
{
method_Operation();
mode_Operation = false;
mode_New = true;
}
}
symbol_Variable = M;
}
private void method_Operation()//运算方法
{
switch (symbol_Variable)
{
case "+":
num_Second = textBox1.Text;
try
{
num_Result = Convert.ToString(Convert.ToDecimal(num_First) + Convert.ToDecimal(num_Second));
}
catch (Exception)
{
textBox1.Text = "太大啦！";
mode_Error = true;
method_AllClean();
return;
}
num_First = num_Result;
num_Second = null;
textBox1.Text = num_Result;
break;
case "-":
num_Second = textBox1.Text;
num_Result = Convert.ToString(Convert.ToDecimal(num_First) - Convert.ToDecimal(num_Second));
num_First = num_Result;
num_Second = null;
textBox1.Text = num_Result;
break;
case "*":
num_Second = textBox1.Text;
try
{
num_Result = Convert.ToString(Convert.ToDecimal(num_First) * Convert.ToDecimal(num_Second));
}
catch (Exception)
{
textBox1.Text = "太大啦！";
mode_Error = true;
method_AllClean();
return;
}
num_First = num_Result;
num_Second = null;
textBox1.Text = num_Result;
break;
case "/":
num_Second = textBox1.Text;
if (num_Second == "0")
{
textBox1.Text = "除数不能为零";
method_AllClean();
return;
}
else
{
num_Result = Convert.ToString(Convert.ToDecimal(num_First) / Convert.ToDecimal(num_Second));
num_First = num_Result;
num_Second = null;
textBox1.Text = num_Result;
}
break;
default: break;
}
}
private void method_AllClean()//全部清除
{
num_First = null;
num_Second = null;
num_Result = null;
num_Circle = null;
symbol_Variable ="";
mode_Operation = true;
mode_Error = false;
mode_New = true;
}
private void button1_Click(object sender, EventArgs e)//按数字键事件
{
method_But_Num(((Button)sender).Text);
}
private void button10_Click(object sender, EventArgs e)//小数点事件
{
if (mode_Operation == true || mode_Error == true || mode_New == true)
{
textBox1.Text = "0.";
}
else
{
if (textBox1.Text.IndexOf(".") > 0) { }
else
{
textBox1.Text += ".";
}
}
mode_Operation = false;
mode_New = false;
}
private void button12_Click(object sender, EventArgs e)//正负号事件
{
if (mode_Error == true)
{
/* num_First = null;
num_Second = null;
num_Result = null;
symbol_Variable = "";
mode_Operation = true;
mode_Error = false;
mode_New = true;
textBox1.Text = "0";
return;*/
method_AllClean();
textBox1.Text = "0";
}
else
{
decimal a = Convert.ToDecimal(textBox1.Text);
a = a * -1;
textBox1.Text = Convert.ToString(a);
}
}
private void button13_Click(object sender, EventArgs e)//加减乘除按键事件
{
method_But_Symbol(((Button)sender).Text);
}
private void button27_Click(object sender, EventArgs e)//归零
{
method_AllClean();
textBox1.Text = "0";
}
private void button25_Click(object sender, EventArgs e)//c事件
{
textBox1.Text = "0";
}
private void button26_Click(object sender, EventArgs e)//等于号事件
{
if (mode_Operation == true)
{
switch (symbol_Variable)
{
case "+":
try
{
textBox1.Text = Convert.ToString(Convert.ToDecimal(textBox1.Text) + Convert.ToDecimal(num_Circle));
}
catch
{
textBox1.Text = "太大啦！";
mode_Error = true;
method_AllClean();
return;
}
break;
case "-":
textBox1.Text = Convert.ToString(Convert.ToDecimal(textBox1.Text) - Convert.ToDecimal(num_Circle));
break;
case "*":
try
{
textBox1.Text = Convert.ToString(Convert.ToDecimal(textBox1.Text) * Convert.ToDecimal(num_Circle));
}
catch
{
textBox1.Text = "太大啦！";
mode_Error = true;
method_AllClean();
return;
}
break;
case "/":
textBox1.Text = Convert.ToString(Convert.ToDecimal(textBox1.Text) / Convert.ToDecimal(num_Circle));
break;
default: break;
}
}
else
{
num_Circle = textBox1.Text;//作用？
method_Operation();
}
num_First = null;
num_Second = null;
num_Result = null;
mode_Operation = true;
mode_Error = false;
}
private void button17_Click(object sender, EventArgs e)//退格事件
{
if (mode_Operation == true)
{
textBox1.Text = "0";
}
else if (textBox1.TextLength > 1)
{
textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length - 1);
}
else
{
textBox1.Text = "0";
}
}
private void button20_Click(object sender, EventArgs e)//根号事件
{
if (mode_Error == true)
{
textBox1.Text = "0";
}
else
{
if (Convert.ToDecimal(textBox1.Text) < 0)
{
textBox1.Text = "被开方数不能为负";
method_AllClean();
return;
}
else
{
textBox1.Text = Convert.ToString(System.Math.Sqrt(Convert.ToDouble(textBox1.Text)));
}
mode_New = true;
}
}
private void button18_Click(object sender, EventArgs e)//百分号
{
if (num_First == null)
{
textBox1.Text = "0";
}
else
{
textBox1.Text = Convert.ToString(Convert.ToDecimal(num_First) * Convert.ToDecimal(textBox1.Text) * (decimal)0.01);
}
mode_New = true;
}
}
}
switch exception
补充：.NET技术 , C#
