Prime numbers program

Question

I\'m currently trying out some questions just to practice my programming skills. ( Not taking it in school or anything yet, self taught ) I came across this problem which re

Answer 1

Running your code through a debugger, I've found that it crashes with a floating point exception at "if ((a % c) == 0)". The reason for this is that you haven't initialized anything in num, so you're doing "a % 0".