c-exercises/undefined-behaviour.c

#include <stdio.h>

int main(void) {
  int a = 5;
  int b = a + 7;
  int c = a - b + 7;

  // c is zero now!
  printf("c = %i\n", c);

  // Depending on e.g. the optimization level, this either throws a
  // floating point exception or does other things like returning 10.
  if (3/c > 4)
    return 5;
  return 10;
}