printf("After swapping (call by value): a = %d, b = %d\n", a, b); printf("Before swapping (call by reference): a = %d, b = %d\n", a, b); ...

Print values of n1 and n2 in main before swapping printf("In Main values before swapping: %d %d\n\n", n1, n2); //Function call to swap n1 and n2 swap(n1, n2); //Print values of n1 and n2 in main after ...