C# simple computation

Question

Hi i'm making an simple c# computation sample Label1.Text = textBox1.Text + textbox2.Text i'm having a problem when i try to input 88.5 or 80.3 and compute my program is keep crashing a getting errors.i already convert the text to Int and here's my code:

 int i;
 i = Convert.ToInt32(textBox1.Text) + Convert.ToInt32(textBox2.Text);
 Label1.Text= i.ToString();

But it's working if i insert 88 and 80 . i know i miss something on this.anyone can help me? thank you

Jon Skeet · Accepted Answer · 2012-11-11 09:44:36Z

5

You're trying to convert "88.5" into an integer. It's not an integer, is it?

I suggest you use decimal instead - and use TryParse so that you can handle invalid user input without resorting to exceptions.

decimal input1, input2;
if (decimal.TryParse(textBox1.Text, out input1) &&
    decimal.TryParse(textBox1.Text, out input2))
{
    Label1.Text = (input1 + input2).ToString();
}
else
{
    Label1.Text = "Invalid input";
}

answered Nov 11, 2012 at 9:44

Jon Skeet

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6 Comments

Jon Skeet Over a year ago

@Jay: But do you understand why it works, and the problems of your original code?

Jay Over a year ago

yeah sir. Because i only use Integer not decimal

Jay Over a year ago

@JonSkeet Sir what if i want to multiply output1 to .20

Tomas Ramirez Sarduy Over a year ago

@Jay: And don't forget to use TryParse ;)

Jay Over a year ago

@JonSkeet sir i use this code decimal ans = (output1 * .20) + (output2 * .20); but i get an error.

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