Implements the void power_ref(int* x, int y) function that calculates the power of x leading to y . The result should be placed in the address indicated in the first parameter, changing its initial value.
I have something like this:
#include <stdio.h>
void power_ref(int* x, int y){
int result = (int) *x ^ y;
*x = result;
printf("result: %d", result);
}
Solution # 1:
void power_ref( int * x, int y )
{
int i = 0;
int n = 1;
for ( i = 0; i < y; i++ )
n *= (*x);
*x = n;
}
Solution # 2:
#include <math.h>
void power_ref( int * x, int y )
{
*x = pow( *x, y );
}
Solution # 3:
void power_ref( int * x, int y )
{
int n = 1;
int b = *x;
while(y)
{
if(y & 1)
n *= b;
y >>= 1;
b *= b;
}
*x = n;
}
Test:
#include <stdio.h>
int main( void )
{
int n = 2;
power_ref( &n, 16 );
printf( "%d\n", n );
return 0;
}