Swap two numbers in C Language ?

Introduction: 

This is very common question asked by Interviewer to fresher to check their basics.

 In this article I will explain swapping using a temporary variable or third variable.

Program example: Let's understand by an program

#include<stdio.h>

#include<conio.h>

void main()

{

 int a,b,temp;

  clrscr();

 printf("Enter the value of a= ");

 scanf("%d",&a);

 printf("\nEnter the value of b= ");

 scanf("%d",&b);

 printf("\nValue of a before swapping= %d",a);

 printf("\nValue of b before swapping= %d",b);

 temp=a;

 a=b;

 b=temp;

 printf("\nValue of a after swapping= %d",a);

 printf("\nValue of b after swapping= %d",b);

 getch();

 }

Run the program using ctrl+F9

Output:

Enter the value of a=11

Enter the value of b=22

Value of a before swapping=11

Value of b before swapping=22

Value of a after swapping=22

Value of b after swapping=11