Swapping of two numbers in C Programming

#include<stdio.h>

int main(int argc, const char * argv[]) 
{ 
        int a = 3;
        int b = 6;

        printf("The value of a before swap is %d \n", a);
        printf("The value of b before swap is %d \n", b);

        // Swapping of two numbers using temp variable
        int temp = a;
        a = b;
        b = temp;

        printf("The value of a after swap is %d \n", a);
        printf("The value of b after swap is %d \n", b);
}

#include<stdio.h>

int main(int argc, const char * argv[]) 
{ 
    int a = 3;
    int b = 6;

    printf("The value of a before swap is %d \n", a);
    printf("The value of b before swap is %d \n", b);

    // Swapping of two numbers using arithmetic operations
    a = a + b;
    b = a - b;
    a = a - b;

    printf("The value of a after swap is %d \n", a);
    printf("The value of b after swap is %d \n", b);
}

#include<stdio.h>

int main(int argc, const char * argv[]) 
{ 
        int a = 3;
        int b = 6;

        printf("The value of a before swap is %d \n", a);
        printf("The value of b before swap is %d \n", b);

        // Swapping of two numbers using arithmetic operations
        b = a + b - (a = b);

        printf("The value of a after swap is %d \n", a);
        printf("The value of b after swap is %d \n", b);
}

#include<stdio.h>

int main(int argc, const char * argv[]) 
{ 
        int a = 3;
        int b = 6;

        printf("The value of a before swap is %d \n", a);
        printf("The value of b before swap is %d \n", b);

        // Swapping of two numbers 
        // using exclusive OR operation (i.e. XOR)
        a = a ^ b;
        b = a ^ b;
        a = a ^ b;

        printf("The value of a after swap is %d \n", a);
        printf("The value of b after swap is %d \n", b);
}