I'm trying to divide a number with a decimal, but i get an error.(DivideByZeroException)

My code is here below and the error is on this line:

res1 = Math.Round(((num3 * num4) / 100) / res, 2);

What am i doing wrong in my calculation?

Here is the numbers i'm typing into my input fields:

num1: 1.07801

num2: 1.06730

num3: 5000

num4: 1

My code is here below and the error is on this line:

res1 = Math.Round(((num3 * num4) / 100) / res, 2);

What am i doing wrong in my calculation?

Here is the numbers i'm typing into my input fields:

num1: 1.07801

num2: 1.06730

num3: 5000

num4: 1

C#:

```
private void button1_Click(object sender, EventArgs e) {
Decimal num1, num2, num3, num4, res, res1;
string str1, str2, str3, str4 = null;
str1 = textBox1.Text;
str2 = textBox2.Text;
str3 = textBox3.Text;
str4 = textBox4.Text;
if (String.IsNullOrEmpty(str1) || String.IsNullOrEmpty(str2) || String.IsNullOrEmpty(str3) || String.IsNullOrEmpty(str4))
{
MessageBox.Show("Please put values in all fields!");
}
else
{
if (str1.Contains(",") == true || str2.Contains(",") == true || str3.Contains(",") == true || str4.Contains(",") == true)
{
MessageBox.Show("Please Use dots instead og comma!");
}
else
{
num1 = Convert.ToDecimal(textBox1.Text);
num2 = Convert.ToDecimal(textBox2.Text);
res = Math.Round((num1 - num2), 1);
label1.Text = Convert.ToString(res) + " Pip";
num3 = Convert.ToDecimal(textBox3.Text);
num4 = Convert.ToDecimal(textBox4.Text);
res1 = Math.Round(((num3 * num4) / 100) / res, 2);
label6.Text = Convert.ToString(res1) + " lots";
}
}
if (str1.Contains(",") == true || str2.Contains(",") == true)
MessageBox.Show("Please use dots instead og comma!");
}
```

Last edited: