CS2263/Assigments/1/Shoebottom_Isaac_A1/isFib.c

#include <math.h>
int isPerfectSquare(int i) {
    int s = sqrt(i);
    return (s*s == i);
}

int isFib(int i) {
    return isPerfectSquare(5*i*i+4) || isPerfectSquare(5*i*i -4);
}