Numeric TextBox

Question

Im new to programming and I dont know very much about but I\'m making a calculator, and i want to use a textbox that only acepts numbers and decimals, and when the user past

Answer 1

i would probably use a regular expression to screen out non-numerics.

pseudo code:

for (each item in the input string) {
   if (!match(some regular expression, item)) {
        toss it out
   } else {
        add item to text box or whatever you were going to do with it
   }

}