#include <stdio.h>

int main( )
{
        int a = 2, b = 3, c = 4;
        int *p = NULL;

        p = &a;
        printf( "pointing to %d\n", *p );
        p = &b;
        printf( "pointing to %d\n", *p );
        p = &c;
        printf( "pointing to %d\n", *p );
}