Dumping Stack trace from an if statement in for loop in C

Question

The i variable is causing my program to crash and it'll work without it but I'm not understanding why and if I replace with any other number it'll work but not do what I'd like.

    void longest_prime_factor(int n){

        for (int i=0;i<n;i++){

            if (n % i == 0) printf("true\n");
        }

   }
    longest_prime_factor(17);

Output

0 [main] primefactors 238 cygwin_exception::open_stackdumpfile: Dumping stack trace to primefactors.exe.stackdump

Trying to mod by 0 won't work, when i = 0. (Division by 0) – Paul T. Jun 17 '20 at 11:47 — Paul T., Jun 17 '20 at 11:47

score 2 · Answer 1 · answered Jun 17 '20 at 11:47

2

The conditional in

if (n % i == 0) printf("true\n");

tries to calculate

n % 0

in the first iteration, which results in a floating point exception. Start with i = 1.

answered Jun 17 '20 at 11:47

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Dumping Stack trace from an if statement in for loop in C

1 Answers1