Pascal validation problem.

Right, slight problem in Pascal that should be easy to sort but I cant see the solution. Im designing a payroll program for a college project and I have a space to enter wages. Now, I only want the user to be able to enter numbers, and all the letters entered to return a user message stating the letter has been entered and to re-enter the value. At the moment, it returns a runtime error.

Has anyone got any ideas how to setup this validation? Thanks it advance.

Read in a string instead of a numeric variable. Then iterate through the string and make sure that it only contains digit characters. If the string looks ok, then convert it to integer.