Try and Catch In Pascal

Question

I\'m using Dev-Pas 1.9.2 and am trying to make sure the program doesn\'t crash when a symbol or a letter value is entered.

I\'ve googled and googled and can\'t find

Answer 1

(in addition to Ken White's)

1. I think one can use READ for a char typed variable, and save the user to type enter.

2. But I would go for a string typed version and use VAL.

   • It is something more encoding agnostic, and
   • the principle extends beyond value 9.
   • requires an enter though, and heavy input will mess up your screen.

For the latter there are other methods (e.g. using unit Crt or Video), but that probably goes beyond the scope of the assignment