C program: swapping of 2 numbers without using 3rd variable

#include<stdio.h>

int main(){

    int a,b,temp;

   

    printf("Enter any two integers: ");

    scanf("%d%d",&a,&b);

    printf("Before swapping: a = %d, b=%d",a,b);

    a=a+b;

    b=a-b;

    a=a-b;

    printf("After swapping: a = %d, b=%d",a,b);

    return 0;

}