Swap with call by reference

 #include<stdio.h>

void wrong_swap(int a, int b);

void swap(int *a, int *b);

int main(){

    int x=3, y=4;

    printf("The value of x and y before swap is %d and %d\n", x, y);

    //wrong_swap(x, y); // will not work due to call by value

    swap(&x, &y); // will work due to call by reference

    printf("The value of x and y after swap is %d and %d\n", x, y);

    return 0;

}

void wrong_swap(int a, int b){

    int temp;

    temp = a;

    a = b;

    b = temp;

}

void swap(int *a, int *b){

    int temp;

    temp = *a;

    *a = *b;

    *b = temp;

}