Swap two number without using third variable c programming langauge

Swap two number without using third variable in c programming language.

For Example:
INPUT:
a = 10;
b = 20;
OUTPUT:
a = 20;
b = 10

// write a c program to swap two numbers without using third variable.
    #include <stdio.h>
    
    int main()
    {
        
        int a, b;
        printf("Enter the value of a : ");
        scanf("%d", &a);
        
        printf("Enter the value of b : ");
        scanf("%d", &b);
        
        a = a + b;
        b = a - b;
        a = a - b;
        
        printf("The value of a is %d and b is %d", a, b);
    
        return 0;
    }