[C] A revision on pointers

#include <stdio.h>
int main() {
    long num1 = 0;
    long num2 = 0;
    long *pnum = NULL;

    pnum = &num1;
    *pnum = 2; //dereferencing pointer
    ++num2;
    num2 += *pnum; //equivalent to num2 + *pnum store in num2
    pnum = &num2;
    ++*pnum;

    printf("%1d %ld %ld %ld", num1, num2, *pnum, *pnum + num2);

        getchar();
        getchar();

        return 0;

}