program to swap 2 varibles with out using of 3rd variable.
1. #include<stdio.h>
2. void main()
3. {
4. int a,b;
5. printf("enter 2 numbers");
6. scanf("%d %d",&a,&b);
7. printf("nthe 2 numbers are %d %d",a,b);
8. a=a^b;
9. b=a^b;
10. a=a^b;
11. printf("n the 2 numbers are %d %d",a,b);
12. }