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SDEV-340-81/week-02-1/Numbers.cpp

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Champlain College SDEV-340-81
*
* C++ Week 2: Assignment (second semester) - Application of OOP (2020/05/24)
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* This is a demonstration of OOP in C++
* More about Classes and Object-Oriented Programming - Chapter 11 (Page 810)
* Programming Challenge (1. Check Writing) Converting numbers to English (en-GB) description of the number.
* (Full Disclosure) I've Been converting numbers to strings in PHP since 2016
* https://github.com/vdm-io/Joomla-Component-Builder/blob/master/admin/helpers/componentbuilder.php#L7409
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* Written by Llewellyn van der Merwe <llewellyn.vandermerw@mymail.champlain.edu>, May 2020
* Copyright (C) 2020. All Rights Reserved
* License GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
// internal classes
#include "Numbers.h"
// libraries
#include <iostream>
#include <cmath>
#include <string>
using namespace std;
using namespace vdm;
// constructor that takes an int
Numbers::Numbers(int number) : number(number) {
// do a sanity check here
if (number < 1000000000 && number > -1000000000) {
// initialize class once we have int set
Numbers::initialize();
} else {
// set the warning (this should never happen, but if someone mess-up)
cout << "Only numbers below 1000000000 and above -1000000000";
}
};
// constructor for no-input
Numbers::Numbers() : number(0) {
// initialize class once we have int set
Numbers::initialize();
};
// constructor that takes a double
Numbers::Numbers(double number) {
// just do a simple cast to int (basic)
Numbers::number = (int) number;
// do a sanity check here
if (number < 1000000000 && number > -1000000000) {
// initialize class once we have int set
Numbers::initialize();
} else {
// set the warning (this should never happen, but if someone mess-up)
cout << "Only numbers below 1000000000 and above -1000000000";
}
};
// constructor with error when string is given
Numbers::Numbers(string number) {
// set the warning (this should never happen, but if someone mess-up)
cout << "Only numbers below 1000000000 and above -1000000000";
};
// initialize multiple methods for the constructor
void Numbers::initialize() {
// initialize the number words
Numbers::initializeNumberWords();
// now convert to string
Numbers::toString();
};
// return the converted number string
string Numbers::print() const {
return Numbers::numberString;
};
// initialize the number words
void Numbers::initializeNumberWords() {
Numbers::words[0] = "zero";
Numbers::words[1] = "one";
Numbers::words[2] = "two";
Numbers::words[3] = "three";
Numbers::words[4] = "four";
Numbers::words[5] = "five";
Numbers::words[6] = "six";
Numbers::words[7] = "seven";
Numbers::words[8] = "eight";
Numbers::words[9] = "nine";
Numbers::words[10] = "ten";
Numbers::words[11] = "eleven";
Numbers::words[12] = "twelve";
Numbers::words[13] = "thirteen";
Numbers::words[14] = "fourteen";
Numbers::words[15] = "fifteen";
Numbers::words[16] = "sixteen";
Numbers::words[17] = "seventeen";
Numbers::words[18] = "eighteen";
Numbers::words[19] = "nineteen";
Numbers::words[20] = "twenty";
Numbers::words[30] = "thirty";
Numbers::words[40] = "forty";
Numbers::words[50] = "fifty";
Numbers::words[60] = "sixty";
Numbers::words[70] = "seventy";
Numbers::words[80] = "eighty";
Numbers::words[90] = "ninety";
};
// Thanks to Tom Nicholson <http://php.net/manual/en/function.strval.php#41988>
// Adapted to C++ by Llewellyn van der Merwe
// This method converts numbers to strings
void Numbers::toString() {
// always rest string
Numbers::numberString = "";
// deal with minus numbers
if (Numbers::number< 0) {
Numbers::numberString = "minus ";
Numbers::number = -Numbers::number;
}
// 0 to 20
if (Numbers::number< 21) {
Numbers::numberString += Numbers::words[Numbers::number];
}
// 21 to 99
else if (Numbers::number< 100) {
Numbers::numberString += Numbers::words[10 * floor(Numbers::number / 10)];
int r = fmod(Numbers::number, 10);
if (r > 0) {
Numbers::numberString += " " + Numbers::words[r];
}
}
// 100 to 999
else if (Numbers::number< 1000) {
Numbers::numberString += Numbers::words[floor(Numbers::number / 100)] + " hundred";
int r = fmod(Numbers::number, 100);
if (r > 0) {
Numbers::numberString += " and " + Numbers::toString(r); // en-GB
}
}
// 1000 to 999999
else if (Numbers::number< 1000000) {
Numbers::numberString += Numbers::toString(floor(Numbers::number / 1000)) + " thousand";
int r = fmod(Numbers::number, 1000);
if (r > 0) {
Numbers::numberString += " ";
if (r < 100) {
Numbers::numberString += "and "; // en-GB
}
Numbers::numberString += Numbers::toString(r);
}
}
// millions
else {
Numbers::numberString += Numbers::toString(floor(Numbers::number / 1000000)) + " million";
int r = fmod(Numbers::number, 1000000);
if (r > 0) {
Numbers::numberString += " ";
if (r < 100) {
Numbers::numberString += "and "; // en-GB
}
Numbers::numberString += Numbers::toString(r);
}
}
// I haven't bothered with "billion" because the word means 10e9 or 10e12 depending who you ask.
// a little bit of fun
if (666 == Numbers::number) {
Numbers::numberString += " (The mark of the beast)";
} else if (2020 == Numbers::number) {
Numbers::numberString += " (The year of COVID-19)";
}
};
// Thanks to Tom Nicholson <http://php.net/manual/en/function.strval.php#41988>
// Adapted to C++ by Llewellyn van der Merwe
// This method converts numbers to strings
string Numbers::toString(int number) {
// local string
string numberString;
// 0 to 20
if (number < 21) {
numberString += Numbers::words[number];
}
// 21 to 99
else if (number < 100) {
numberString += Numbers::words[10 * floor(number / 10)];
int r = fmod(number, 10);
if (r > 0) {
numberString += " " + Numbers::words[r];
}
}
// 100 to 999
else if (number < 1000) {
numberString += Numbers::words[floor(number / 100)] + " hundred";
int r = fmod(number, 100);
if (r > 0) {
numberString += " and " + Numbers::toString(r); // en-GB
}
}
// 1000 to 999999
else if (number < 1000000) {
numberString += Numbers::toString(floor(number / 1000)) + " thousand";
int r = fmod(number, 1000);
if (r > 0) {
numberString += " ";
if (r < 100) {
numberString += "and "; // en-GB
}
numberString += Numbers::toString(r);
}
}
// millions
else {
numberString += Numbers::toString(floor(number / 1000000)) + " million";
int r = fmod(number, 1000000);
if (r > 0) {
numberString += " ";
if (r < 100) {
numberString += "and "; // en-GB
}
numberString += Numbers::toString(r);
}
}
// I haven't bothered with "billion" because the word means 10e9 or 10e12 depending who you ask.
return numberString;
};
// Enable class to have toString ability
// https://stackoverflow.com/a/1549937/1429677
ostream &vdm::operator<<(ostream &outputStream, const Numbers &num) {
return outputStream << num.print() << endl;
};
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