几年的程序员 差点做不出来

差点翻船

要用后缀表达式才简单

逻辑该得多复杂

水平有限，只能做个最基本的

namespace 计算器
{
public partial class Form1 : Form
{
char operChar = ' ';
float num1;
bool pointFlag, symbolFlag;
public Form1()
{
InitializeComponent();
}
public void addNum(int num)
{
if (textBox1.Text == "ERROR")
{
return;
}
if (textBox1.Text == "0" || symbolFlag)
{
textBox1.Text = num.ToString();
}
else
{
textBox1.Text += num.ToString();
}
symbolFlag = false;
}
private void button0_Click(object sender, EventArgs e)
{
addNum(0);
}
private void button1_Click(object sender, EventArgs e)
{
addNum(1);
}
private void button2_Click(object sender, EventArgs e)
{
addNum(2);
}
private void button3_Click(object sender, EventArgs e)
{
addNum(3);
}
private void button4_Click(object sender, EventArgs e)
{
addNum(4);
}
private void button5_Click(object sender, EventArgs e)
{
addNum(5);
}
private void button6_Click(object sender, EventArgs e)
{
addNum(6);
}
private void button7_Click(object sender, EventArgs e)
{
addNum(7);
}
private void button8_Click(object sender, EventArgs e)
{
addNum(8);
}
private void button9_Click(object sender, EventArgs e)
{
addNum(9);
}
private void btnPoint_Click(object sender, EventArgs e)
{
if (!pointFlag)
{
if (textBox1.Text == "0" || symbolFlag)
{
textBox1.Text = "0.";
}
else
{
textBox1.Text += ".";
}
}
pointFlag = true;
symbolFlag = false;
}

private void btnPlus_Click(object sender, EventArgs e)
{
guocheng('+');
}
private void btnMinus_Click(object sender, EventArgs e)
{
guocheng('-');
}
private void btnMul_Click(object sender, EventArgs e)
{
guocheng('*');
}
private void btnDivide_Click(object sender, EventArgs e)
{
guocheng('/');
}
private void btnEqual_Click(object sender, EventArgs e)
{
if (textBox1.Text == "ERROR")
{
return;
}
jisuan();
symbolFlag = true;
pointFlag = false;
}
private void btnClear_Click(object sender, EventArgs e)
{
textBox1.Text = "0";
num1 = 0;
operChar = ' ';
pointFlag = false;
symbolFlag = false;
}
public void jisuan()
{
switch (operChar)
{
case '+':
textBox1.Text = (num1 + float.Parse(textBox1.Text)).ToString();
break;
case '-':
textBox1.Text = (num1 - float.Parse(textBox1.Text)).ToString();
break;
case '*':
textBox1.Text = (num1 * float.Parse(textBox1.Text)).ToString();
break;
case '/':
if (textBox1.Text == "0")
{
textBox1.Text = "ERROR";
}
else
{
if (textBox1.Text == "ERROR")
{
return;
}
textBox1.Text = (num1 / float.Parse(textBox1.Text)).ToString();
}
break;
}
}
public void guocheng(char tmpOperChar)
{
jisuan();
if (textBox1.Text == "ERROR")
{
return;
}
operChar = tmpOperChar;
num1 = float.Parse(textBox1.Text);
pointFlag = false;
symbolFlag = true;
}
private void Form1_Load(object sender, EventArgs e)
{
textBox1.Text = "0";
textBox1.TextAlign = HorizontalAlignment.Right;
}
}
}

这是体现数学水平吧