Listing Even Numbers in C++

What are Even Numbers?

Hello pupils, what are even numbers?
Answer:
Even numbers are numbers that are divisible by 2.

They include:

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ...

Well then, let's see how we can write a programming code to make our computer list a set of even numbers in the C++ language, between a given range of values.

Create a new C++ project; call it Arithmetic.
Create a new C++ class file; call it EvenNumbers.

Type out the adjoining CPlusPlus code for listing even numbers.
We will see what each significant part does as we go along.

How to run CPlusPlus Codes

Run the code from the main function class by pressing key f6 or the run symbol.

C++ code for EvenNumbers Header File.

#pragma once

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

class EvenNumbers {
public:
    EvenNumbers(unsigned, unsigned);
    virtual ~EvenNumbers();
    string prepResult();
private:
    unsigned int start; // Our starting point
    unsigned int stop; // where we will stop
    string result; // Store result here.
    stringstream aux; // helps us convert int to string
};

EvenNumbers Class File.

#include "stdafx.h"
#include "EvenNumbers.h"

/**
* Our constructor.
* @param first - for the start value
* @param last - for the end value
*/
EvenNumbers::EvenNumbers(unsigned first, unsigned last) {
    start = first;
    stop = last;
    aux << first;
    result = "Even numbers between " + aux.str();
    aux.str(""); // clear 'aux'
    aux << last;
    result += " and " + aux.str() + " are: \n";
    aux.str("");
}

/**
* nitty gritty
* @return - list of the required even numbers.
*/
string EvenNumbers::prepResult() {
    /*
    * Loop from start to stop and rip out odd numbers;
    */
    while (start <= stop) {
        if ((start % 2) == 0) { // modulo(%) is explained below
            aux << start;
            result = result + aux.str() + "; ";
            aux.str("");
        }
        start = start + 1; // increase start by 1
    }
    return result;
}

EvenNumbers::~EvenNumbers() {
}

Main Class C++ code.

// Arithmetic.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "EvenNumbers.h"

#include <iostream>

using namespace std;

int main() {
    try {

        cout << "\n    Welcome to our demonstration sequels\n";
        cout << "Hope you enjoy (and follow) the lessons.\n\n";

        unsigned int start = 1, stop = 100;

        /*
        * Use the Even Number class.
        */
        EvenNumbers e_list(start, stop);
        cout << e_list.prepResult() << "\n";

    }    catch (exception& e) {
        cout << "\n" << e.what() << "\n";
    }
    return 0;
}

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