Swap 2 nos. without using third variable

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 //Program to Swap  
 //Downloaded from www.c4cprog.co.nr  
 #include<conio.h>  
 void main()  
 {  
 int a,b,c;  
 clrscr();  
 printf("\nEnter Nos. A & B\n");  
 scanf("%d%d",&a,&b);  
 c=a;  
 a=b;  
 b=c;  
 printf("\nThe Swapped Val : A=%d , B=%d ",a,b);  
 printf("\n\nMethod II \n");  
 printf("\n\n\nEnter Nos. A & B\n");  
 scanf("%d%d",&a,&b);  
 a=a-b;  
 b=a+b;  
 a=b-a;  
 printf("\nThe Swapped Val : A=%d , B=%d ",a,b);  
 getch();  
 }