First C++

Here is the first C++ code example:

#include <iostream>
#include <string>
#include <cmath>
using namespace std;

int cube(int); //function prototype

int main()
{
/* this is a simple hello application
the comment can cross 
several lines */
    cout << "Enter your name" << endl;
    char name[25];
    cin.getline(name, 25);
    
    cout <<  "Hello," << name  << endl;
   
    cout << "Enter a number" << endl;
    int num;
    cin >> num;
    cout << "the cube of " << num << " is " << cube(num) << endl;
    cout << "The square root of " << num << " is " << sqrt((double)num) << endl;
    //this is just to pause the console
    char c; //declare a character type variable
    cin >> c; //wait for console entry
}

int cube (int x)
{
    return x * x * x;
}