Anonymous

#include <stdio.h>

#define sgn(x) (x>0)-(x<0)

int loopcheck(long limit, long index, long increment) {
  long a=index-limit;
  long b=a+increment;
  return (sgn(a)!=sgn(b));
}

int main(void) {
  printf("%d",loopcheck(10,9,1));
}