Write a program to swaps two elements using the concept of pointers.

Dr. A.P.J. Abdul Kalam Technical University, Lucknow

KCS101 / KCS201 Programming for Problem Solving - Using C Language

Lab Exercises

30. Write a program to swaps two elements using the concept of pointers.

/*

 File: Prgrm30.c

 Author: Aditya Saini

 Date: Sept 30, 2019

 Description: Program to swap two elements using the concept of pointers.

*/

#include <stdio.h>

void swap (int *, int *);

int main (void)

{

               int variable_1, variable_2;

               //Input the value of variables.
               printf ("Input the value of first variable: ");
               scanf ("%d", &variable_1);
               printf ("Input the value of second variable: ");
               scanf ("%d", &variable_2);

               //Calling swap function.

               swap (&veriable_1, &veriable_2);

               //Output the result.
               printf ("\nAfter Swapping\n");
               printf ("Value of first variable: %d \n", variable_1);
               printf ("Value of second variable: %d \n", variable_2);

               return 0;

};

void swap (int *first, int *second)
{
               int temp;

               //Swapping the elements
               temp = *first;
               *first = *second;
               *second = temp;
};

Output

Input the value of first variable: 15
Input the value of second variable: 17

After Swapping
Value of first variable: 17
Value of second variable: 15