Question

How to find cube root in C

Answer 1

#include <stdio.h>

double cubeRoot(double n) {
   double i, precision = 0.000001;
   
   for (i = 1; (i*i*i) <= n; i++);        
   
   for (--i; (i*i*i) < n; i += precision);

   return i;
}

int main(void) {
    double n = 27;

    printf("%lf\n", cubeRoot(n));
    
    printf("%lf\n", cubeRoot(16));
}



/*
run:

3.000000
2.519843

*/

 

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Answer 2

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

double cubeRoot(double n) {
    if (n >= 0)
        return pow(n, (double) 1 / 3);
    else
        return -pow((-n), (double) 1 / 3);
}
 
int main(void) {
    double n = 27;
 
    printf("%lf\n", cubeRoot(n));
    printf("%lf\n", cubeRoot(16));
    printf("%lf\n", cubeRoot(-27));
    printf("%lf\n", cubeRoot(64));
}
 
 
 
/*
run:
 
3.000000
2.519842
-3.000000
4.000000
 
*/

 

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