Swap Two Numbers using Function in C++

// C++ program to illustrate how to swap two variables using
// a function in C++
#include <iostream>
using namespace std;

// function to swap two variables
void swap(int* a, int* b)
{
    int temp = *a;
    *a = *b;
    *b = temp;
}

// driver code
int main()
{
    int a = 10;
    int b = 22;

    cout << "Before Swapping: " << endl;
    cout << " a: " << a << " b: " << b << endl;

    // calling swap
    swap(&a, &b);

    cout << "After Swapping: " << endl;
    cout << " a: " << a << " b: " << b << endl;

    return 0;
}

// C++ program to illustrate how to swap two numbers using
// function template
#include <iostream>
#include <string>
using namespace std;

// function template to swap two values
template <typename T> void swap_func(T& a, T& b)
{
    T temp = a;
    a = b;
    b = temp;
}

// driver code
int main()
{
    string s1 = "Geeks", s2 = "for";
    int num1 = 10, num2 = 22;

    cout << "Before Swapping:" << endl;
    cout << s1 << "  " << s2 << endl;
    cout << num1 << "  " << num2 << endl;

    swap_func(s1, s2);
    swap_func(num1, num2);

    cout << "\nAfter Swapping:" << endl;
    cout << s1 << "  " << s2 << endl;
    cout << num1 << "  " << num2 << endl;

    return 0;
}