SWAPF.C

#include<stdio.h>
#include<conio.h>
void swap1();
void swap2();
int n,a,b,c;
void main()
{
clrscr();
{
printf("\t\tProgram for swapping :\n\nEnter your choice:\n1.Swap using a third variable.\n2.Swap without third variable.\n\n");
scanf("%d",&n);
switch(n){
	case 1: swap1();
	break;
	case 2: swap2();
	break;
	default:
	printf("Please enter correct option.");
	}
	}
getch();
}


void swap1(){
printf("\nEnter the value of a:");
	scanf("%d",&a);
	printf("\nEnter the value of b:");
	scanf("%d",&b);
	printf("\nThe value of a=%d\tand the value of b=%d\t before swapping.",a,b);
	c=a;
	printf("\nc=%d",c);
	a=b;
	printf("\na=%d",a);
	b=c;
	printf("\nb=%d",b);
	printf("\nThe value of a=%d\tand the value of b=%d\t after swapping",a,b);
	}
void swap2(){
	printf("\nEnter the value of a:");
	scanf("%d",&a);
	printf("\nEnter the value of b:");
	scanf("%d",&b);
	printf("\nThe value of a=%d\tand the value of b=%d\t before swapping.",a,b);
	a=a+b;
	printf("\na=%d",a);
	b=a-b;
	printf("\nb=%d",b);
	a=a-b;
	printf("\na=%d",a);
	printf("\nThe value of a=%d\tand the value of b=%d\t after swapping.",a,b);
	}