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Change value of variable through pointer

#include <stdio.h> int main(void) {   long num1 = 0;   long num2 = 0;   long *pnum = NULL;   pnum = &num1;                                 *pnum = 2;                                    ++num2;                                       num2 += *pnum;                                pnum = &num2;                                 ++*pnum;                                      printf ("\nnum1 = %ld  num2 = %ld  *pnum = %ld  *pnum + num2 = %ld\n",                                       num1, num2, *pnum, *pnum + num2);   return 0; } num1 = 2 num2 = 4 *pnum = 4 *pnum + num2 = 8