Question

How to check whether a number is a perfect cube root in C

Answer 1

// The cube root is a whole number. For example, 27 is a perfect cube, as ∛27 or (27)**1/3 = 3

#include <stdbool.h>
#include <stdio.h>
#include <math.h>

bool isPerfectCubeRoot(int x) {
    x = abs(x);

    int cubeRoot = (int)round(pow(x, 1.0 / 3.0));

    return pow(cubeRoot, 3) == x;
}

int main() {
    printf("%d\n", isPerfectCubeRoot(16));
    printf("%d\n", isPerfectCubeRoot(64));
    printf("%d\n", isPerfectCubeRoot(27));
    printf("%d\n", isPerfectCubeRoot(25));
    printf("%d\n", isPerfectCubeRoot(-64));
    printf("%d\n", isPerfectCubeRoot(-27));
    printf("%d\n", isPerfectCubeRoot(729));

    return 0;
}



/*
run:

0
1
1
0
1
1
1

*/

 

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