Thread: Jumping into C++ - Chapter 7 - Practice problem 1

This is a possible solution I came about to turn numbers (from 1 to 99) into English text.

Code:

// This program converts numbers from 1 to 99 to English text.
#include <iostream>


using namespace std;


// Functions
int checkHowManyDigits(int number);
void printNumber(int numberOfDigits,int number);
void printOneDigit(int number);
void printTwoDigits(int number);
void printTenToNineteen(int number);


int main()
{
    // Get input from user
    cout << "Enter a number: ";
    int number;
    cin >> number;
    cout << '\n';


    // Check how many digits the number has
    int numberOfDigits = checkHowManyDigits(number);


    // Print out the number
    printNumber(numberOfDigits, number);


    cout << '\n';
    return 0;
}


int checkHowManyDigits(int number)
{
    if (number / 10 == 0) // It means the number is smaller than ten and so has only one digit
    {
        return 1;
    }
    else
    {
        return 2;
    }
}


void printNumber(int numberOfDigits,int number)
{
    if (numberOfDigits == 1)
    {
        printOneDigit(number);
    }
    else if (numberOfDigits == 2)
    {
        printTwoDigits(number);
    }
}


void printOneDigit(int number)
{
    if (number == 0)
        cout << "Zero";


    else if (number == 1)
        cout << "One";


    else if (number == 2)
        cout << "Two";


    else if (number == 3)
        cout << "Three";


    else if (number == 4)
        cout << "Four";


    else if (number == 5)
        cout << "Five";


    else if (number == 6)
        cout << "Six";


    else if (number == 7)
        cout << "Seven";


    else if (number == 8)
        cout << "Eight";


    else if (number == 9)
        cout << "Nine";
}


void printTwoDigits(int number)
{
    if (number / 10 == 1) // It means the number is between 10 and 19
    {
        printTenToNineteen(number);
    }
    else if (number / 10 == 2)
    {
        cout << "Twenty";
        int  secondDigit = number % 10;
        if (secondDigit != 0)
        {
            cout << "-";
            printOneDigit(secondDigit);
        }
    }
    else if (number / 10 == 3)
    {
        cout << "Thirty";
        int  secondDigit = number % 10;
        if (secondDigit != 0)
        {
            cout << "-";
            printOneDigit(secondDigit);
        }
    }
    else if (number / 10 == 4)
    {
        cout << "Forty";
        int  secondDigit = number % 10;
        if (secondDigit != 0)
        {
            cout << "-";
            printOneDigit(secondDigit);
        }
    }
    else if (number / 10 == 5)
    {
        cout << "Fifty";
        int  secondDigit = number % 10;
        if (secondDigit != 0)
        {
            cout << "-";
            printOneDigit(secondDigit);
        }
    }
    else if (number / 10 == 6)
    {
        cout << "Sixty";
        int  secondDigit = number % 10;
        if (secondDigit != 0)
        {
            cout << "-";
            printOneDigit(secondDigit);
        }
    }
    else if (number / 10 == 7)
    {
        cout << "Seventy";
        int  secondDigit = number % 10;
        if (secondDigit != 0)
        {
            cout << "-";
            printOneDigit(secondDigit);
        }
    }
    else if (number / 10 == 8)
    {
        cout << "Eighty";
        int  secondDigit = number % 10;
        if (secondDigit != 0)
        {
            cout << "-";
            printOneDigit(secondDigit);
        }
    }
    else if (number / 10 == 9)
    {
        cout << "Ninety";
        int  secondDigit = number % 10;
        if (secondDigit != 0)
        {
            cout << "-";
            printOneDigit(secondDigit);
        }
    }
}


void printTenToNineteen(int number)
{
    if (number == 10)
        cout << "Ten" << endl;


    else if (number == 11)
        cout << "Eleven" << endl;


    else if (number == 12)
        cout << "Twelve" << endl;


    else if (number == 13)
        cout << "Thirteen" << endl;


    else if (number == 14)
        cout << "Fourteen" << endl;


    else if (number == 15)
        cout << "Fifteen" << endl;


    else if (number == 16)
        cout << "Sixteen" << endl;


    else if (number == 17)
        cout << "Seventeen" << endl;


    else if (number == 18)
        cout << "Eighteen" << endl;


    else if (number == 19)
        cout << "Nineteen" << endl;
}

Thanks for the suggestion. To be honest I just started learning c++ and I don't know anything about arrays yet. I did this exercise with the little knowledge I have of the language. Thanks anyway; it may be helpful for someone else or for me in the future.