Question

How to implement the power function in C

Answer 1

#include <stdio.h>
 
double myPow(double base, int exp) {
    double power = 1;
    
    while (1) {
        if (exp & 1)
            power *= base;
        exp >>= 1;
        if (!exp)
            break;
        base *= base;
    }
 
    return power;
}
 
int main()
{
    printf("%.2lf\n", myPow(2.0, 3));
    printf("%.2lf\n", myPow(3, 3));  
    printf("%.2lf\n", myPow(6.0, 2));
    printf("%.2lf\n", myPow(2, 2)); 
    printf("%.2lf\n", myPow(5.0, 2)); 
    printf("%.2lf\n", myPow(-2, 4));
     
    return 0;
}

 
 
/*
run:
  
8.00
27.00
36.00
4.00
25.00
16.00
 
*/

 

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