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What's the pointer in C programming



What's the pointer in C programming

#include <stdio.h>

void main()
{
   long number1 = 0;
   long number2 = 0;
   long *pnum = NULL;

   pnum = &number1;    /* Get number1's address     */
   *pnum = 2;       /* assign 2 to number1       */
   ++number2;          /* Increment number2         */
   number2 += *pnum;   /* Add number1 to number2       */

   pnum = &number2;    /* Get address of number2       */
   ++*pnum;         /* Increment number2 indirectly */

   printf ("\nnumber1 = %ld  number2 = %ld  *pnum = %ld  *pnum + number2 = %ld\n",
                                      number1, number2, *pnum, *pnum + number2);
}

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