C# c中的减法运算出错#
我正在用c#编写一个程序。我已经写了三个数字的减法逻辑，但是它显示了错误的输出。下面是我的代码。任何帮助都将不胜感激C# c中的减法运算出错#,c#,.net,subtraction,C#,.net,Subtraction,我正在用c#编写一个程序。我已经写了三个数字的减法逻辑，但是它显示了错误的输出。下面是我的代码。任何帮助都将不胜感激 private void btnSub_Click(object sender, EventArgs e) { if (ch != "-") { num1 = num1 - double.Parse(textBox1.Text); } else {
private void btnSub_Click(object sender, EventArgs e)
{
if (ch != "-")
{
num1 = num1 - double.Parse(textBox1.Text);
}
else
{
num1= Convert.ToInt32(textBox1.Text);
ch = "";
}
textBox1.Text = "";
op = "-";
textBox1.Text += op;
}
namespace Cal1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
static double num1, num2 = 0;
string op;
static string ch = "";
private void button1_Click_1(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Text = "";
textBox1.Text = textBox1.Text + button1.Text;
}
else
{
textBox1.Text = textBox1.Text + button1.Text;
}
}
private void button2_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Text = "";
textBox1.Text = textBox1.Text + button2.Text;
}
else
{
textBox1.Text = textBox1.Text + button2.Text;
}
}
private void button3_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + button3.Text;
}
else
textBox1.Text = textBox1.Text + button3.Text;
}
private void button4_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + button4.Text;
}
else
textBox1.Text = textBox1.Text + button4.Text;
}
private void button5_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + button5.Text;
}
else
textBox1.Text = textBox1.Text + button5.Text;
}
private void button6_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + button6.Text;
}
else
textBox1.Text = textBox1.Text + button6.Text;
}
private void button7_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + button7.Text;
}
else
textBox1.Text = textBox1.Text + button7.Text;
}
private void button8_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + button8.Text;
}
else
textBox1.Text = textBox1.Text + button8.Text;
}
private void button9_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + button9.Text;
}
else
textBox1.Text = textBox1.Text + button9.Text;
}
private void button10_Click(object sender, EventArgs e)
{
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + button10.Text;
}
else
textBox1.Text = textBox1.Text + button10.Text;
}
private void btnEqual_Click(object sender, EventArgs e)
{
double result;
num2 = double.Parse(textBox1.Text);
textBox1.Text = "";
switch (op)
{
case "+":
result = num1 + num2;
textBox1.Text += result;
num1 = result;
ch = "+";
break;
case "-":
result = num1 - num2;
textBox1.Text += result;
num1 = result;
ch = "-";
break;
case "*":
result = num1 * num2;
textBox1.Text += result;
num1 = result;
ch = "*";
break;
case "/":
result = num1 / num2;
textBox1.Text += result;
num1 = result;
ch = "/";
break;
}
}
private void btnAdd_Click(object sender, EventArgs e)
{
if (ch != "+")
{
num1 = double.Parse(textBox1.Text)+ num1;
}
else
{
num1 = Convert.ToInt32(textBox1.Text);
ch = "";
}
textBox1.Text = "";
op = "+";
}
private void btnSub_Click(object sender, EventArgs e)
{
if (ch != "-")
{
num1 = num1 - double.Parse(textBox1.Text);
}
else
{
num1= Convert.ToInt32(textBox1.Text);
ch = "";
}
textBox1.Text = "";
op = "-";
textBox1.Text += op;
}
private void btnMul_Click(object sender, EventArgs e)
{
if (ch != "*")
{
num1 = double.Parse(textBox1.Text) * num1;
}
else
{
num1 = Convert.ToInt32(textBox1.Text);
ch = "";
}
textBox1.Text = "";
op = "*";
}
private void btnDiv_Click(object sender, EventArgs e)
{
if (ch != "/")
{
num1 = double.Parse(textBox1.Text) / num1;
}
else
{
num1 = Convert.ToInt32(textBox1.Text);
ch = "";
}
textBox1.Text = "";
op = "/";
}
首先，由于您的方法
button1\u单击\u 1button10\u单击private void NumberButtonClicked(object sender, EventArgs e)
{
var buttonClicked = (Button)sender;
if (textBox1.Text == "+" || textBox1.Text == "-" || textBox1.Text == "*" || textBox1.Text == "/")
{
textBox1.Clear();
textBox1.Text = textBox1.Text + buttonClicked.Text;
}
else
textBox1.Text = textBox1.Text + buttonClicked.Text;
}
btnSub_中单击检查字段ch
，但您从未将其设置为值（除了空字符串ch=”“
）。。。也许你真的想检查op
？我不确定
另一件事是使用btnDiv\u单击方法。您可以将输入的值除以之前输入的值。。。难道不是相反吗
num1 = num1 / double.Parse(textBox1.Text);
最好的办法是，您检查这些内容，如果它仍然不起作用，您可以在btnSub\u单击的开始处设置一个断点，在单击时检查变量的值，并通过单步执行来调试方法。问题可能在于按“等于”后没有清除这些值。让我们一步一步地看一下您的示例（7-4-3）：
按equals键后不会清除值，因此后续操作将受上一个num1值的影响。这不是计算器通常的工作方式，所以我猜这不是您想要的行为，可能是一个在后续操作中导致奇怪结果的错误
如果第一次操作的结果正确，但之后不正确，这就是原因。ch is string，则可能需要使用.Equal（）
方法。并且，您没有将文本框文本设置为Substraction的结果textbox1.Text=num1.ToString（）
我想它只是显示为输出？当您显示要显示的值时，通常效果会更好。您将其重置为“”，然后添加-
。它显示错误的输出7-4-3我给它显示8尝试提供完整的（至少对于这种方法）代码，如ch和num1…您给出7-4-3
是什么意思如果您在textbox1中插入，那么您的代码将在第行抛出异常。Parse（textbox1.Text）
1) press 7:
textbox1.Text="7";
2) press -:
num1 = num1 - double.Parse(textBox1.Text); = 7
ch = "";
3) press 4:
textbox1.Text="4";
4) press -:
num1 = num1 - double.Parse(textBox1.Text); = 7-4 = 3
ch="";
5) press 3:
textbox1.Text="3";
6) press equals?
num2 = 3;
result = num1 - num2; = 3-3 = 0
textBox1.Text += result; = "0", which is correct
num1 = result; = 0 (accidentaly in this case, but sometimes another value will be left in here)