Q-4-a: Write a program to swap two numbers by using third variables.

#include<stdio.h>

#include<conio.h>

void main()

{

                int a,b,temp;

                clrscr();

                printf("\n\t\tENTER ANY NUMBER FOR a:");

                scanf("%d",&a);

                printf("\n\t\tENTER ANY NUMBER FOR b:");

                scanf("%d",&b);

                                temp=a;

                                a=b;

                                b=temp;

                printf("\n\t\tTHE SWAPPING OF a=%d AND b=%d",a,b);

                getch();

}

Q-4-a: Write a program to swap two numbers without using third variables.

#include<stdio.h>

#include<conio.h>

void main()

{

                int a,b;

                clrscr();

                printf("\n\t\tENTER ANY NUMBER FOR a:");

                scanf("%d",&a);

                printf("\n\t\tENTER ANY NUMBER FOR b:");

                scanf("%d",&b);

                                a=a+b;

                                b=a-b;

                                a=a-b;

                printf("\n\t\tTHE SWAPPING OF a=%d AND b=%d",a,b);

                getch();

}