Write a C program to calculate pow(x,n)?

There are again different methods to do this in C

Brute force C program
int pow(int x, int y)
{
if(y == 1) return x ;
return x * pow(x, y-1) ;
}

Divide and Conquer C program
#include <stdio.h>
int main(int argc, char*argv[])
{
printf("\n[%d]\n",pow(5,4));
}
int pow(int x, int n)
{
if(n==0)return(1);
else if(n%2==0)
{
return(pow(x,n/2)*pow(x,(n/2)));
}
else
{
return(x*pow(x,n/2)*pow(x,(n/2)));
}
}
Also, the code above can be optimized still by calculating pow(z, (n/2)) only one time (instead of twice) and using its value in the two return() expressions above.