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send a message if try to divide by zero

Posted on 2009-06-29
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Last Modified: 2013-12-17
Hello, I have a windows form 2 textboxes, 1, button, 1 label.
I click button and first number is divided by second.
the result is displayed in a label.
I have an exception that if someone inputs a letter an error will come back- but I also want a message to show if I try to divide by 0.
I have pasted code.
thank you
private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                double num1 = double.Parse(textBox1.Text);
                double num2 = double.Parse(textBox2.Text);
 
                label1.Text = (num1 / num2).ToString();
            }
            catch (Exception ex)
            {
                MessageBox.Show("error:" + ex.Message);
            }
        }

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Question by:davetough
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5 Comments
 
LVL 3

Expert Comment

by:eirikurh
ID: 24741482
           try
            {
                double num1 = double.Parse(textBox1.Text);
                double num2 = double.Parse(textBox2.Text);
 
                label1.Text = (num1 / num2).ToString();
            }
            catch (DivideByZeroException ex)
            {
                MessageBox.Show("division by zero error:" + ex.Message);
            }
            catch (Exception ex)
            {
                MessageBox.Show("error:" + ex.Message);
            }


But i would always try to avoid exceptions
            double num1 = double.Parse(textBox1.Text);
            double num2 = double.Parse(textBox2.Text);
           if (num1 > 0 && num2 > 2)
           {
            label1.Text = "0"
.....

0
 

Author Comment

by:davetough
ID: 24741536
your most likely right about avoiding - but I am trying to see how it works:
I may be doing something wrong but- I pasted code in and If I divide by zero I get infinity in label
thank you
0
 
LVL 3

Expert Comment

by:eirikurh
ID: 24741717
http://msdn.microsoft.com/en-us/library/system.dividebyzeroexception.aspx
The exception that is thrown when there is an attempt to divide an integral or decimal value by zero.

Doesn´t work for double values, they always +- Infinity

try using decimal instead

                decimal num1 = Int32.Parse(textBox1.Text);
                decimal num2 = Int32.Parse(textBox2.Text);
               
                label1.Text = (num1 / num2).ToString();

0
 
LVL 3

Accepted Solution

by:
eirikurh earned 2000 total points
ID: 24741721
decimal num1 = Decimal.Parse(textBox1.Text);
decimal num2 = Decimal.Parse(textBox2.Text);
               
label1.Text = (num1 / num2).ToString();
0
 

Author Comment

by:davetough
ID: 24741865
thank you
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