Write a C Program to input two numbers from the user and interchange their values without the help of the third Variable.

  1. #include<stdio.h>  
  2.  int main()    
  3. {    
  4. int a=10, b=20;      
  5. printf("Before swap a=%d b=%d",a,b);      
  6. a=a+b;//a=30 (10+20)    
  7. b=a-b;//b=10 (30-20)    
  8. a=a-b;//a=20 (30-10)    
  9. printf("\nAfter swap a=%d b=%d",a,b);    
  10. return 0;  
  11. }