calling by reference and pointers c 2b 2b

1#include <iostream>
2using namespace std;
3
4// Function prototype
5void swap(int&, int&);
6
7int main()
8{
9    int a = 1, b = 2;
10    cout << "Before swapping" << endl;
11    cout << "a = " << a << endl;
12    cout << "b = " << b << endl;
13
14    swap(a, b);
15
16    cout << "\nAfter swapping" << endl;
17    cout << "a = " << a << endl;
18    cout << "b = " << b << endl;
19
20    return 0;
21}
22
23void swap(int& n1, int& n2) {
24    int temp;
25    temp = n1;
26    n1 = n2;
27    n2 = temp;
28}

1#include <iostream>
2using namespace std;
3
4// Function prototype
5void swap(int*, int*);
6
7int main()
8{
9    int a = 1, b = 2;
10    cout << "Before swapping" << endl;
11    cout << "a = " << a << endl;
12    cout << "b = " << b << endl;
13
14    swap(&a, &b);
15
16    cout << "\nAfter swapping" << endl;
17    cout << "a = " << a << endl;
18    cout << "b = " << b << endl;
19    return 0;
20}
21
22void swap(int* n1, int* n2) {
23    int temp;
24    temp = *n1;
25    *n1 = *n2;
26    *n2 = temp;
27}