C Program to swap two numbers using + and - without third variable

 // C Program to swap two numbers using + and  - without third variable

#include<stdio.h>   //header file declaration

 int main()    //main method

{    

int p=25, q=50;      //variable declaration

printf("Before swapping values: p=%d q=%d\n",p,q);      //Before swapping value

p=p+q;   

q=p-q;    //use of + and -

p=p-q;   

printf("\nAfter swapping values: p=%d q=%d",p,q);     // After swapping value

return 0;  

}

OUTPUT: