C Program to Swap Two Numbers Using Pointers

 Ex: Write a C program to swap two numbers using pointers. How to write a C program to swap two numbers using pointers. C program to swap two numbers using pointers.

Input from user:

Enter first number: 10

Enter second number: 20

Expected output:

Numbers after swapping:

Number1=20

Number2=10

In this program we will use two pointer operators:

1. Reference operator (&)

2. Dereference operator (*)

  Step by step logic of the given program:

1. Accept two numbers from user declare variable say no1 & no2.

2. Use third variable(temp) to swap two numbers, shown as follow:

temp=*ptr1;

*ptr1=*ptr2;

*ptr2=temp;

3. Last print swapped numbers.

  C Program to Swap Two Numbers Using Pointers :

#include<stdio.h>

int main()

{

int no1,no2,temp;      

int *ptr1=&no1,*ptr2=&no2;

printf("Enter first number:\n");

scanf("%d",&no1);

printf("Enter second number:\n");

scanf("%d",&no2);  

         temp=*ptr1;

*ptr1=*ptr2;

*ptr2=temp;

printf("Numbers after swapping:\nNumber1=%d\nNumber2=%d",*ptr1,*ptr2);

        return 0;

}

Above program shows the following output: