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

Description

Use pointers to modify values stored in some other variables.

Demo Code

#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);
  return 0;/*from  w ww . j av a 2s . c  o m*/
}

Result

• Previous
• Next

Related Tutorials

• Use scanf() to get input values for a pointer that already contains an address
• Using pointers to make swapping work
• Checks to see where variables are stored with address operator
• Use a pointer on the right-hand side of an assignment statement to assign its value to another pointer.
• To access the target value indirectly pointed to by a pointer to a pointer, apply the asterisk operator twice