Swapping of Two Number

#include
#include
void main()
{
int a=10,b=20,t;
clrscr();
printf("\nGiven Value A = %d and B = %d",a,b);
a=a+b;
b=a-b;
a=a-b;
printf("\nSwap Value Without Using Temporary Variable A = %d and B = %d",a,b);
t=a;
a=b;
b=t;
printf("\nSwap Value Using Temporary Variable A = %d and B = %d",a,b);
getch();
}
Output
Given Value A = 10 and B = 20
Swap Value Without Using Temporary Variable A = 20 and B = 10
Swap Value Using Temporary Variable A = 10 and B = 20