Write code to convert given number into words (eg 1234 as input should output one thousand two hundred and thirty four)

Question

Write C/C++/Java code to convert given number into words.

eg:- Input: 1234

Output: One thousand two hundred thirty-four.

Input: 10

Output: Ten

Answer 1

if you are interested in a ready solution then you may look at HumanizerCpp library (https://github.com/trodevel/HumanizerCpp) - it is a port of C# Humanizer library and it does exactly what you want.

It can even convert to ordinals and currently supports 3 languages: English, German and Russian.

Example:

const INumberToWordsConverter * e = Configurator::GetNumberToWordsConverter( "en" );

std::cout << e->Convert( 123 ) << std::endl;
std::cout << e->Convert( 1234 ) << std::endl;
std::cout << e->Convert( 12345 ) << std::endl;
std::cout << e->Convert( 123456 ) << std::endl;

std::cout << std::endl;
std::cout << e->ConvertToOrdinal( 1001 ) << std::endl;
std::cout << e->ConvertToOrdinal( 1021 ) << std::endl;


const INumberToWordsConverter * g = Configurator::GetNumberToWordsConverter( "de" );

std::cout << std::endl;
std::cout << g->Convert( 123456 ) << std::endl;

const INumberToWordsConverter * r = Configurator::GetNumberToWordsConverter( "ru" );

std::cout << r->ConvertToOrdinal( 1112 ) << std::endl;

Output:

one hundred and twenty-three
one thousand two hundred and thirty-four
twelve thousand three hundred and forty-five
one hundred and twenty-three thousand four hundred and fifty-six

thousand and first
thousand and twenty-first

einhundertdreiundzwanzigtausendvierhundertsechsundfünfzig
одна тысяча сто двенадцатый

In any case you may take a look at the source code and reuse in your project or try to understand the logic. It is written in pure C++ without external libraries.

Regards, Serge

Answer 2

/*Maximum value that can be entered is 2,147,483,647
 * Program to convert entered number into string
 * */
import java.util.Scanner;

public class NumberToWords 
{

public static void main(String[] args) 
{
    double num;//for taking input number
    Scanner obj=new Scanner(System.in);
    do
    {
        System.out.println("\n\nEnter the Number (Maximum value that can be entered is 2,147,483,647)");
        num=obj.nextDouble();
        if(num<=2147483647)//checking if entered number exceeds maximum integer value
        {
            int number=(int)num;//type casting double number to integer number
            splitNumber(number);//calling splitNumber-it will split complete number in pairs of 3 digits
        }
        else
            System.out.println("Enter smaller value");//asking user to enter a smaller value compared to 2,147,483,647
    }while(num>2147483647);
}
//function to split complete number into pair of 3 digits each
public static void splitNumber(int number)
{   //splitNumber array-contains the numbers in pair of 3 digits
    int splitNumber[]=new int[4],temp=number,i=0,index;
    //splitting number into pair of 3
    if(temp==0)
        System.out.println("zero");
    while(temp!=0)
    {
        splitNumber[i++]=temp%1000;
        temp/=1000;
    }
    //passing each pair of 3 digits to another function
    for(int j=i-1;j>-1;j--)
    {   //toWords function will split pair of 3 digits to separate digits
        if(splitNumber[j]!=0)
            {toWords(splitNumber[j]);
        if(j==3)//if the number contained more than 9 digits
            System.out.print("billion,");
        else if(j==2)//if the number contained more than 6 digits & less than 10 digits
            System.out.print("million,");
        else if(j==1)
            System.out.print("thousand,");//if the number contained more than 3 digits & less than 7 digits
            }
            }       
}
//function that splits number into individual digits
public static void toWords(int number)
    //splitSmallNumber array contains individual digits of number passed to this function
{   int splitSmallNumber[]=new int[3],i=0,j;
    int temp=number;//making temporary copy of the number
    //logic to split number into its constituent digits

    while(temp!=0)
    {
        splitSmallNumber[i++]=temp%10;
        temp/=10;
    }
    //printing words for each digit
    for(j=i-1;j>-1;j--)
      //{   if the digit is greater than zero
        if(splitSmallNumber[j]>=0)
            //if the digit is at 3rd place or if digit is at (1st place with digit at 2nd place not equal to zero)
        {   if(j==2||(j==0 && (splitSmallNumber[1]!=1)))
            {
                switch(splitSmallNumber[j])
                {

                    case 1:System.out.print("one ");break;
                    case 2:System.out.print("two ");break;
                    case 3:System.out.print("three ");break;
                    case 4:System.out.print("four ");break;
                    case 5:System.out.print("five ");break;
                    case 6:System.out.print("six ");break;
                    case 7:System.out.print("seven ");break;
                    case 8:System.out.print("eight ");break;
                    case 9:System.out.print("nine ");break;

            }

        }
        //if digit is at 2nd place
        if(j==1)
        {       //if digit at 2nd place is 0 or 1
                if(((splitSmallNumber[j]==0)||(splitSmallNumber[j]==1))&& splitSmallNumber[2]!=0 )
                System.out.print("hundred ");
            switch(splitSmallNumber[1])
            {   case 1://if digit at 2nd place is 1 example-213
                        switch(splitSmallNumber[0])
                        {
                        case 1:System.out.print("eleven ");break;
                        case 2:System.out.print("twelve ");break;
                        case 3:System.out.print("thirteen ");break;
                        case 4:System.out.print("fourteen ");break;
                        case 5:System.out.print("fifteen ");break;
                        case 6:System.out.print("sixteen ");break;
                        case 7:System.out.print("seventeen ");break;
                        case 8:System.out.print("eighteen ");break;
                        case 9:System.out.print("nineteen ");break;
                        case 0:System.out.print("ten ");break;
                        }break;
                        //if digit at 2nd place is not 1
                    case 2:System.out.print("twenty ");break;
                    case 3:System.out.print("thirty ");break;
                    case 4:System.out.print("forty ");break;
                    case 5:System.out.print("fifty ");break;
                    case 6:System.out.print("sixty ");break;
                    case 7:System.out.print("seventy ");break;
                    case 8:System.out.print("eighty ");break;
                    case 9:System.out.print("ninety ");break;
                    //case 0:   System.out.println("hundred ");break;

            }                           
        }           
    }
  }

}