C Program for Swapping of Two Numbers

#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c;
clrscr();
printf("\t\t\n Swapping of Two Number\n");
printf("\t\t\n ***************\n");
begin:
printf("\n 1.Using Temporary Variable\n");
printf("\n 2.Without using Temporary variable\n");
printf("\n 3.Exit \n");
printf("\n Enter your choice:\n");
scanf("%d",&c);
switch(c)
{
case 1:
printf("\n Input:\n");
printf("\n****\n");
printf("\nBefore Swapping\n");
printf("\n**********\n");
printf("\nEnter the a value:\n");
scanf("%d",&a);
printf("\nEnter the b value:\n");
scanf("%d",&b);
    c=a;
    a=b;
    b=c;
printf("\n Output:\n");
printf("\n*****\n");
printf("\nAfter Swapping\n");
printf("\n*********\n");
printf("\nA value is:%d\n",a);
printf("\nB value is:%d\n",b);
break;

case 2:
printf("\nInput:\n");
printf("\n***\n");
printf("\nBefore Swapping\n");
printf("\n**********\n");
printf("\nEnter the a value:\n");
scanf("%d",&a);
printf("\nEnter the b value:\n");
scanf("%d",&b);
a=a+b;
b=a-b;
a=a-b;
printf("\nOutput:\n");
printf("\n****\n");
printf("\nAfter Swapping\n");
printf("\n*********\n");
printf("\nA Value is:%d\n",a);
printf("\nB Value is:%d\n",b);
break;
case 3:
exit(0);
break;
}
getch();
}