C program to swap two numbers using pointers

Write a C program to swap two numbers using pointers.

  #include <stdio.h>

  /* swaps the given two numbers using pointers */
  void swap(int *x1, int *x2) {
        int temp;
        temp = *x1;
        *x1 = *x2;
        *x2 = temp;
        return;
  }

  int main() {
        int v1, v2;

        /* get the first input from the user */
        printf("Enter your first input:");
        scanf("%d", &v1);

        /* get the second input from the user */
        printf("Enter your second input:");
        scanf("%d", &v2);

        /* data befor swapping */
        printf("Before Swapping:\n");
        printf("Value1: %d\tValue2: %d\n", v1, v2);

        /* swaps given two numbers */
        swap(&v1, &v2);

        /* result after swapping */
        printf("After Swapping:\n");
        printf("Value1: %d\tValue2: %d\n", v1, v2);

        return 0;
  }

  Output:

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your first input:10
  Enter your second input:20
  Before Swapping:
  Value1: 10 Value2: 20
  After Swapping:
  Value1: 20 Value2: 10