Well, i was making a calculator and was having trouble with the + operator because the input was from a text box, making it a string. I went to w3schools, and found the eval function. It worked. But i want to know, what happens if you throw letters at it? I tried using it for a thing that stops any letters in the text box at the top of the calculator...but it didn't work. I found out how to do that, but what does it do?Thanks in Advance.Choco