C++ program for Converting digit/number to words

February 18, 2021

Converting digit/number to words

The conversion of numbers in words is just a conversion of numeric values to the English format of reading numbers. This code supports the conversion of numbers from 0 – 9999 in English format. Digits have different places when read from its ones place to above. Different places for numbers are:-

  • Single digits:- Ones
  • Two Digits:-Tens
  • Three Digits:- Hundreds
  • Four Digits:- Thousands
Converting digit/number to words

Algorithm

  1.  Taking input as a string from the user.
  2.  Check the length of the input.
  3.  if the length is zero print ’empty’ and if the length is greater than 4 print ‘give a string of specific length’
  4.  if length id between 1 – 4, Create arrays for different values.
  5.  Checking the length of the string.
  6.  According to the place of the digit, we will show the output.

C++ Code:-

    
    //C++ program
    //convert number to text
    #include<iostream>
    #include<string.h>
    using namespace std;
    //main Program
    void numToWords(string num)
    {
        int length_of_string = strlen(num);
        if (length_of_string == 0){
             cout<<“String is Empty”; 
             return;
        }
        
        if (length_of_string > 4){
            cout<<“Please enter the string with supported length”; 
            return;  
        }
        string ones_digits = {“zero”, “one”, “two”, “three”, “four”, “five”, “six”, “seven”, “eight”, “nine”}; 
        string tens_digits = {“”, “ten”, “eleven”, “twelve”, “thirteen”, “fourteen”, “fifteen”, “sixteen”, “seventeen”, “eighteen”,“nineteen”}; 
        string multiple_of_ten = {“”, “”, “twenty”, “thirty”, “forty”, “fifty”, “sixty”, “seventy”, “eighty”, “ninety”}; 
        string power_of_ten = {“hundred”, “thousand”};
        cout<<num<<“:\n“;
        if (length_of_string == 1){  
        cout<<ones_digits[num[0] – ‘0’]; 
        return;
        }
        int x=0;
        while (x < strlen(num)){
            if(length_of_string >= 3){
                if (num[x] – 48 != 0){
                    cout<<ones_digits[num[x] – 48]<<“\n“;
                    cout<<power_of_ten[length_of_string – 3]<<“\n“;
                    length_of_string–;
                }
            }
            else{
                if (num[x] – 48 == 1){
                    sum = (num[x] – 48 + num[x] – 48); 
                    cout<<tens_digits[sum]); 
                    return;
                }
                else if(num[x] – 48 == 2 and num[x + 1] – 48 == 0){
                    cout<<“twenty”; 
                    return;
                }
                else{
                    int i = num[x] – 48; 
                    if(i > 0){
                        print(multiple_of_ten[i], end = ” “); 
                    }
                    else{ 
                        print(“”, end = “”); 
                    }
                    x += 1; 
                    if(num[x] – 48 != 0){
                        cout<<ones_digits[num[x] – 48];
                    }
                    }
            }
            x++;
        }
    }
    int main()
    {
        numToWords(“1121”);
        return 0;
    }

    
    
    Output:
    1121 : one thousand one hundred twenty one
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