What are Even Numbers? | Maths Explanation for C++ Kids
Hello pupils, what are even numbers?
Answer:
Even numbers are numbers that are divisible by 2.
They include:
Considering how simple and straight-forward even numbers are, writing a C++ code for even numbers
serves as a great way to introduce our Mathematics educational activities for young learners.
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.
Bear in mind, we use only a loop and a simple conditional statement for the C++ code.
Create a new C++ project;
call it Arithmetic.
Create a new C++ class file;
call it EvenNumbers.
Type out the adjoining C++ code for listing even numbers.
How to run C++ Codes
Run the code from the main function class by pressing
key f6 or the run symbol.
So! C++ Fun Practice Exercise - List Even Numbers
As a fun practice exercise, feel free to try out your own boundary values, and see how the C++ code lists the even numbers between those boundary values.
C++ Code for Even Numbers - Header File.
#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
};
C++ Code for Even Numbers - Class File.
#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() {
}
C++ Code for Even Numbers - Main Class C++ code.
//
#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;
}