C - Using pointers to modify values stored in some other variables.

Description

Using pointers to modify values stored in some other variables.

Demo

#include <stdio.h>

int main(void)
{
  long num1 = 0L;
  long num2 = 0L;
  long *pnum = NULL;

  pnum = &num1;                                 // Get address of num1
  *pnum = 2L;                                   // Set num1 to 2
  ++num2;                                       // Increment num2
  num2 += *pnum;                                // Add num1 to num2

  pnum = &num2;                                 // Get address of num2
  ++*pnum;                                      // Increment num2 indirectly

  printf("num1 = %ld  num2 = %ld  *pnum = %ld  *pnum + num2 = %ld\n",
    num1, num2, *pnum, *pnum + num2);//from   w  ww . j a v a2s.  com
  return 0;
}

Result

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