Program That Swap (Exchange) The Value Of Two Variables.

WRITE A PROGRAM THAT SWAP (EXCHANGE) THE VALUE OF TWO VARIABLES.

#include<stdio.h>       // Header file  “Standard Input and Output”

#include<conio.h>      //Header file “Console input and output”

void main ()

{

            clrscr();                                                // Clear the output screen

            int a, b, c;

            a = 15;

b = 25;

c = a;                           // The value of a copied in c

a = b;                           // the value of a is exchanged by b

b = c;                           // and value of b is exchanged by c

printf(“After swapping the values of a and b is %d, %d“, a, b);

getch();

}

OUTPUT

After swapping the values of a and b is 25 15

EXPLANATION

Initially we have taken two variables “a” and “b” and gave initial values 15 and 25 respectively. In the second step we have swapped (exchange) the values of variable “a” and “b” by using another variable “c”. For swapping values of any two variables we always use an extra variable.