Write a function which swaps two int* in c and also write call to that function [closed]

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A nice C interview 开发者_如何学JAVAquestion:

Can you write a function which swaps two int* in C and also write a call to that function?

int a = 10, b = 20;
int* first_pointer = &a;
int* second_pointer = &b;
/* Below line should print (*first_pointer) = 10, (*second_pointer) = 20 */
printf("(*first_pointer) = %d, (*second_pointer) = %d\n",*first_pointer, *second_pointer);
/// **** Call your swap function here ****
/* Below line should print (*first_pointer) = 20, (*second_pointer) = 10 */
printf("(*first_pointer) = %d, (*second_pointer) = %d\n",*first_pointer, *second_pointer);

---

Function is here,

void swap(int** first_pointer, int **second_pointer)
{
  int *temp = *first_pointer;
  *first_pointer = *second_pointer;
  *second_pointer = temp;
}

function call is here,

int a = 10, b = 20;
int* first_pointer = &a;
int* second_pointer = &b;
// Below will print (*first_pointer) = 10, (*second_pointer) = 20
printf("(*first_pointer) = %d, (*second_pointer) = %d\n",*first_pointer, *second_pointer);
swap(&first_pointer, &second_pointer);
// Below will print (*first_pointer) = 20, (*second_pointer) = 10
printf("(*first_pointer) = %d, (*second_pointer) = %d\n",*first_pointer, *second_pointer);