Last Updated on August 17, 2021 by Hammad Rauf

Today after many years of spending my life in the Java world, I decided to revisit the C/C++ land. To my surprise I found out that C++ has made great progress in standardizing the language through the ISO C++ standards process. Anyway, after some initial struggle I finally got this code working.

It is a simple routine, first demonstrated by my teacher and friend in an Oracle Report Writer application for printing bank cheques. I later rewrote it for teaching a C Programming course. Here it is in C++.

(For experimenting with this code yourself, try it on this link for an online compiler http://codepad.org/IvztdjY6 )

#include <string>
#include <stdio.h>


class NumberToWord {

public:
 string convert(int numb);

private:
 string convertInner(int numb);
 string matcher(int digit, int placeValue);
};


string NumberToWord::convert(int numb) {
	string words;
	if(numb<1000000)
           words = convertInner(numb);

	return words;
}

string NumberToWord::convertInner(int numb) {
        string words = "";
        int hund_thousand = 0;
        int ten_thousand = 0;
        int unit_thousand = 0;
        int hundred = 0;
        int tens = 0;
        int units = 0;        

        if((numb>=1000) & (numb<1000000)) {
           hund_thousand = numb / 100000;
           numb -= (hund_thousand*100000);
           ten_thousand = numb / 10000;
           numb -= (ten_thousand*10000);
           unit_thousand = numb / 1000;
           numb -= (unit_thousand*1000);
        }

        
        if(numb<1000) {
           hundred = numb / 100;
           numb -= (hundred*100);
           tens = numb / 10;
           numb -= (tens*10);
           units = numb;
        }


        words += matcher(hund_thousand, 100);
        words += " ";
        words += matcher(ten_thousand, 10);
        words += " ";
        words += matcher(unit_thousand, 1);
        words += " thousand ";

        words += matcher(hundred, 100);
        words += " ";
        words += matcher(tens, 10);
        words += " ";
        words += matcher(units, 1);


        return words;
}

string NumberToWord::matcher(int digit, int placeValue) {
	string result = "none";

	if((placeValue == 1) | (placeValue == 100)) {
           switch(digit) {
             case 1 : result = "one"; break;
             case 2 : result = "two"; break;
             case 3 : result = "three"; break;
             case 4 : result = "four"; break;
             case 5 : result = "five"; break;
             case 6 : result = "six"; break;
             case 7 : result = "seven"; break;
             case 8 : result = "eight"; break;
             case 9 : result = "nine"; break;
             case 0 : result = "";
           }
        }

	if(placeValue == 10) {
           switch(digit) {
             case 1 : result = "ten"; break;
             case 2 : result = "twenty"; break;
             case 3 : result = "thirty"; break;
             case 4 : result = "forty"; break;
             case 5 : result = "fifty"; break;
             case 6 : result = "sixty"; break;
             case 7 : result = "seventy"; break;
             case 8 : result = "eighty"; break;
             case 9 : result = "ninety"; break;
             case 0 : result = "";
           }
        }

        return result;
}


int main(int argc, char *argv[])
{
        int n=27543;
	printf("Hello World!\n");
        cout << "Number to Convert: " << n << endl;
        NumberToWord n1;
        cout << "Converted result: " << (n1.convert(n)) << endl;
	getchar();
	return 0;
}