double pow(double, double );

pow() returns base raised to the exp power.

compile in linux with: gcc pow.c -o pow -lm -Wall

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
#include <math.h> /* including math library */
 
int main( void )
{
    printf ("4 to the 2th power is: %lf\n ", pow(4, 2));
    return 0;
}

output:
 user@host:~$ /pow 
 4 to the 2th power is: 16.000000