1  #include <stdio.h>
 2
 3  int main(void) {
 4     int *ptr1, *ptr2;
 5     int i = 10, j = 20;
 6
 7     ptr1 = &i;
 8     ptr2 = &j;
 9
10     *ptr1 = *ptr1 + *ptr2;
11     ptr2 = ptr1;
12     *ptr2 = 2 * (*ptr2);
13     printf("Val = %d\n", *ptr1 + *ptr2);
14     return 0;
15  }