Interchange Two Numbers without temp variable in C

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Q. Write a C program to interchange the value of two variable without using third variable

#include <stdio.h>
#include <conio.h>
void main() { 
 int x, y; 
 clrscr(); 
 printf("Enter two numbers: "); 
 scanf("%d%d", &x, &y); 
 printf("Before interchange(swapping) the numbers\nx= %d\ty= %d\n", x, y);
 x=x+y; 
 y=x-y; 
 x=x-y;
 printf("After interchange(swapping) the numbers\nx= %d\ty= %d", x, y); 
 getch(); 
}
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Q. Write an algorithm to Interchange Two Numbers without temp variable in C.

1. Start
2. Read two integers `x` and `y` from the user
3. Display the values of `x` and `y` before swapping
4. Perform swapping:
    - Set `x = x + y`
    - Set `y = x - y` (which is original `x`)
    - Set `x = x - y` (which is original `y`)
5. Display the values of `x` and `y` after swapping
6. End
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