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Program to convert a given number to words | Set 2
• Difficulty Level : Hard
• Last Updated : 31 May, 2020

Write code to convert a given number into words.

Examples:

```Input: 438237764
Output: forty three crore eighty two lakh
thirty seven thousand seven hundred and
sixty four

Input: 999999
Output: nine lakh ninety nine thousand nine
hundred and ninety nine

Input: 1000
Output: one thousand
Explanation:1000 in words is "one thousand"
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

We have already discussed an approach that handles numbers from 0 to 9999 in the previous post.

Solution: This approach can handle number till 20-digits long which are less than ULLONG_MAX (Maximum value for an object of type unsigned long long int). ULLONG_MAX is equal to 18446744073709551615 in decimal assuming compiler takes 8 bytes for storage of unsigned long long int.

Below representation shows place value chart for any 9 digits positive integer:

```4  3  8  2  3  7  7  6  4
|  |  |  |  |  |  |  |  |__ ones' place
|  |  |  |  |  |  |  |__ __ tens' place
|  |  |  |  |  |  |__ __ __ hundreds' place
|  |  |  |  |  |__ __ __ __ thousands' place
|  |  |  |  |__ __ __ __ __ tens thousands' place
|  |  |  |__ __ __ __ __ __ hundred thousands' place
|  |  |__ __ __ __ __ __ __ one millions' place
|  |__ __ __ __ __ __ __ __ ten millions' place
|__ __ __ __ __ __ __ __ __ hundred millions' place
```

The idea is to divide the number into individual digits based on the above place value chart and handle them starting from the Most Significant Digit. Here’s a simple implementation that supports numbers having a maximum of 9 digits. The program can be easily extended to support any 20-digit number.

## C++

 `/* C++ program to print a given number in words.``   ``The program handles till 9 digits numbers and``   ``can be easily extended to 20 digit number */``#include ``using` `namespace` `std;`` ` `// strings at index 0 is not used, it is to make array``// indexing simple``string one[] = { ``""``, ``"one "``, ``"two "``, ``"three "``, ``"four "``,``                 ``"five "``, ``"six "``, ``"seven "``, ``"eight "``,``                 ``"nine "``, ``"ten "``, ``"eleven "``, ``"twelve "``,``                 ``"thirteen "``, ``"fourteen "``, ``"fifteen "``,``                 ``"sixteen "``, ``"seventeen "``, ``"eighteen "``,``                 ``"nineteen "` `};`` ` `// strings at index 0 and 1 are not used, they is to``// make array indexing simple``string ten[] = { ``""``, ``""``, ``"twenty "``, ``"thirty "``, ``"forty "``,``                 ``"fifty "``, ``"sixty "``, ``"seventy "``, ``"eighty "``,``                 ``"ninety "` `};`` ` `// n is 1- or 2-digit number``string numToWords(``int` `n, string s)``{``    ``string str = ``""``;``    ``// if n is more than 19, divide it``    ``if` `(n > 19)``        ``str += ten[n / 10] + one[n % 10];``    ``else``        ``str += one[n];`` ` `    ``// if n is non-zero``    ``if` `(n)``        ``str += s;`` ` `    ``return` `str;``}`` ` `// Function to print a given number in words``string convertToWords(``long` `n)``{``    ``// stores word representation of given number n``    ``string out;`` ` `    ``// handles digits at ten millions and hundred``    ``// millions places (if any)``    ``out += numToWords((n / 10000000), ``"crore "``);`` ` `    ``// handles digits at hundred thousands and one``    ``// millions places (if any)``    ``out += numToWords(((n / 100000) % 100), ``"lakh "``);`` ` `    ``// handles digits at thousands and tens thousands``    ``// places (if any)``    ``out += numToWords(((n / 1000) % 100), ``"thousand "``);`` ` `    ``// handles digit at hundreds places (if any)``    ``out += numToWords(((n / 100) % 10), ``"hundred "``);`` ` `    ``if` `(n > 100 && n % 100)``        ``out += ``"and "``;`` ` `    ``// handles digits at ones and tens places (if any)``    ``out += numToWords((n % 100), ``""``);`` ` `    ``return` `out;``}`` ` `// Driver code``int` `main()``{``    ``// long handles upto 9 digit no``    ``// change to unsigned long long int to``    ``// handle more digit number``    ``long` `n = 438237764;`` ` `    ``// convert given number in words``    ``cout << convertToWords(n) << endl;`` ` `    ``return` `0;``}`

## Java

 `/* Java program to print a given number in words. ``The program handles till 9 digits numbers and ``can be easily extended to 20 digit number */``class` `GFG {`` ` `    ``// Strings at index 0 is not used, it is to make array``    ``// indexing simple``    ``static` `String one[] = { ``""``, ``"one "``, ``"two "``, ``"three "``, ``"four "``,``                            ``"five "``, ``"six "``, ``"seven "``, ``"eight "``,``                            ``"nine "``, ``"ten "``, ``"eleven "``, ``"twelve "``,``                            ``"thirteen "``, ``"fourteen "``, ``"fifteen "``,``                            ``"sixteen "``, ``"seventeen "``, ``"eighteen "``,``                            ``"nineteen "` `};`` ` `    ``// Strings at index 0 and 1 are not used, they is to``    ``// make array indexing simple``    ``static` `String ten[] = { ``""``, ``""``, ``"twenty "``, ``"thirty "``, ``"forty "``,``                            ``"fifty "``, ``"sixty "``, ``"seventy "``, ``"eighty "``,``                            ``"ninety "` `};`` ` `    ``// n is 1- or 2-digit number``    ``static` `String numToWords(``int` `n, String s)``    ``{``        ``String str = ``""``;``        ``// if n is more than 19, divide it``        ``if` `(n > ``19``) {``            ``str += ten[n / ``10``] + one[n % ``10``];``        ``}``        ``else` `{``            ``str += one[n];``        ``}`` ` `        ``// if n is non-zero``        ``if` `(n != ``0``) {``            ``str += s;``        ``}`` ` `        ``return` `str;``    ``}`` ` `    ``// Function to print a given number in words``    ``static` `String convertToWords(``long` `n)``    ``{``        ``// stores word representation of given number n``        ``String out = ``""``;`` ` `        ``// handles digits at ten millions and hundred``        ``// millions places (if any)``        ``out += numToWords((``int``)(n / ``10000000``), ``"crore "``);`` ` `        ``// handles digits at hundred thousands and one``        ``// millions places (if any)``        ``out += numToWords((``int``)((n / ``100000``) % ``100``), ``"lakh "``);`` ` `        ``// handles digits at thousands and tens thousands``        ``// places (if any)``        ``out += numToWords((``int``)((n / ``1000``) % ``100``), ``"thousand "``);`` ` `        ``// handles digit at hundreds places (if any)``        ``out += numToWords((``int``)((n / ``100``) % ``10``), ``"hundred "``);`` ` `        ``if` `(n > ``100` `&& n % ``100` `> ``0``) {``            ``out += ``"and "``;``        ``}`` ` `        ``// handles digits at ones and tens places (if any)``        ``out += numToWords((``int``)(n % ``100``), ``""``);`` ` `        ``return` `out;``    ``}`` ` `    ``// Driver code``    ``public` `static` `void` `main(String[] args)``    ``{``        ``// long handles upto 9 digit no``        ``// change to unsigned long long int to``        ``// handle more digit number``        ``long` `n = ``438237764``;`` ` `        ``// convert given number in words``        ``System.out.printf(convertToWords(n));``    ``}``}`

## Python3

 `# Python3 program to print a given number in words.``# The program handles till 9 digits numbers and``# can be easily extended to 20 digit number `` ` `# strings at index 0 is not used, it ``# is to make array indexing simple``one ``=` `[ "``", "``one ``", "``two ``", "``three ``", "``four ",``        ``"five "``, ``"six "``, ``"seven "``, ``"eight "``,``        ``"nine "``, ``"ten "``, ``"eleven "``, ``"twelve "``,``        ``"thirteen "``, ``"fourteen "``, ``"fifteen "``,``        ``"sixteen "``, ``"seventeen "``, ``"eighteen "``,``        ``"nineteen "``];`` ` `# strings at index 0 and 1 are not used, ``# they is to make array indexing simple``ten ``=` `[ "``", "``", "``twenty ``", "``thirty ``", "``forty ",``        ``"fifty "``, ``"sixty "``, ``"seventy "``, ``"eighty "``,``        ``"ninety "``];`` ` `# n is 1- or 2-digit number``def` `numToWords(n, s):`` ` `    ``str` `=` `"";``     ` `    ``# if n is more than 19, divide it``    ``if` `(n > ``19``):``        ``str` `+``=` `ten[n ``/``/` `10``] ``+` `one[n ``%` `10``];``    ``else``:``        ``str` `+``=` `one[n];`` ` `    ``# if n is non-zero``    ``if` `(n):``        ``str` `+``=` `s;`` ` `    ``return` `str``;`` ` `# Function to print a given number in words``def` `convertToWords(n):`` ` `    ``# stores word representation of given ``    ``# number n``    ``out ``=` `"";`` ` `    ``# handles digits at ten millions and ``    ``# hundred millions places (if any)``    ``out ``+``=` `numToWords((n ``/``/` `10000000``), ``                            ``"crore "``);`` ` `    ``# handles digits at hundred thousands ``    ``# and one millions places (if any)``    ``out ``+``=` `numToWords(((n ``/``/` `100000``) ``%` `100``),``                                   ``"lakh "``);`` ` `    ``# handles digits at thousands and tens ``    ``# thousands places (if any)``    ``out ``+``=` `numToWords(((n ``/``/` `1000``) ``%` `100``), ``                             ``"thousand "``);`` ` `    ``# handles digit at hundreds places (if any)``    ``out ``+``=` `numToWords(((n ``/``/` `100``) ``%` `10``), ``                            ``"hundred "``);`` ` `    ``if` `(n > ``100` `and` `n ``%` `100``):``        ``out ``+``=` `"and "``;`` ` `    ``# handles digits at ones and tens``    ``# places (if any)``    ``out ``+``=` `numToWords((n ``%` `100``), "");`` ` `    ``return` `out;`` ` `# Driver code`` ` `# long handles upto 9 digit no``# change to unsigned long long ``# int to handle more digit number``n ``=` `438237764``;`` ` `# convert given number in words``print``(convertToWords(n));`` ` `# This code is contributed by mits`

## C#

 `/* C# program to print a given number in words. ``The program handles till 9 digits numbers and ``can be easily extended to 20 digit number */``using` `System;``class` `GFG {`` ` `    ``// strings at index 0 is not used, it is``    ``// to make array indexing simple``    ``static` `string``[] one = { ``""``, ``"one "``, ``"two "``, ``"three "``, ``"four "``,``                            ``"five "``, ``"six "``, ``"seven "``, ``"eight "``,``                            ``"nine "``, ``"ten "``, ``"eleven "``, ``"twelve "``,``                            ``"thirteen "``, ``"fourteen "``, ``"fifteen "``,``                            ``"sixteen "``, ``"seventeen "``, ``"eighteen "``,``                            ``"nineteen "` `};`` ` `    ``// strings at index 0 and 1 are not used,``    ``// they is to make array indexing simple``    ``static` `string``[] ten = { ``""``, ``""``, ``"twenty "``, ``"thirty "``, ``"forty "``,``                            ``"fifty "``, ``"sixty "``, ``"seventy "``, ``"eighty "``,``                            ``"ninety "` `};`` ` `    ``// n is 1- or 2-digit number``    ``static` `string` `numToWords(``int` `n, ``string` `s)``    ``{``        ``string` `str = ``""``;`` ` `        ``// if n is more than 19, divide it``        ``if` `(n > 19) {``            ``str += ten[n / 10] + one[n % 10];``        ``}``        ``else` `{``            ``str += one[n];``        ``}`` ` `        ``// if n is non-zero``        ``if` `(n != 0) {``            ``str += s;``        ``}`` ` `        ``return` `str;``    ``}`` ` `    ``// Function to print a given number in words``    ``static` `string` `convertToWords(``long` `n)``    ``{`` ` `        ``// stores word representation of``        ``// given number n``        ``string` `out1 = ``""``;`` ` `        ``// handles digits at ten millions and``        ``// hundred millions places (if any)``        ``out1 += numToWords((``int``)(n / 10000000),``                           ``"crore "``);`` ` `        ``// handles digits at hundred thousands``        ``// and one millions places (if any)``        ``out1 += numToWords((``int``)((n / 100000) % 100),``                           ``"lakh "``);`` ` `        ``// handles digits at thousands and tens``        ``// thousands places (if any)``        ``out1 += numToWords((``int``)((n / 1000) % 100),``                           ``"thousand "``);`` ` `        ``// handles digit at hundreds places (if any)``        ``out1 += numToWords((``int``)((n / 100) % 10),``                           ``"hundred "``);`` ` `        ``if` `(n > 100 && n % 100 > 0) {``            ``out1 += ``"and "``;``        ``}`` ` `        ``// handles digits at ones and tens``        ``// places (if any)``        ``out1 += numToWords((``int``)(n % 100), ``""``);`` ` `        ``return` `out1;``    ``}`` ` `    ``// Driver code``    ``static` `void` `Main()``    ``{``        ``// long handles upto 9 digit no``        ``// change to unsigned long long int to``        ``// handle more digit number``        ``long` `n = 438237764;`` ` `        ``// convert given number in words``        ``Console.WriteLine(convertToWords(n));``    ``}``}`` ` `// This code is contributed by mits`

## PHP

 ` 19)``        ``{``            ``\$str` `.= ``\$ten``[(int)(``\$n` `/ 10)];``            ``\$str` `.= ``\$one``[``\$n` `% 10];``        ``}``    ``else``        ``\$str` `.= ``\$one``[``\$n``];`` ` `    ``// if n is non-zero``    ``if` `(``\$n` `!= 0 )``        ``\$str` `.= ``\$s``;`` ` `    ``return` `\$str``;``}`` ` `// Function to print a given number in words``function` `convertToWords(``\$n``)``{``    ``// stores word representation of ``    ``// given number n``    ``\$out` `= ``""``;`` ` `    ``// handles digits at ten millions and ``    ``// hundred millions places (if any)``    ``\$out` `.= numToWords((int)(``\$n` `/ 10000000), ``"crore "``);`` ` `    ``// handles digits at hundred thousands ``    ``// and one millions places (if any)``    ``\$out` `.= numToWords(((int)(``\$n` `/ 100000) % 100), ``"lakh "``);`` ` `    ``// handles digits at thousands and tens``    ``// thousands places (if any)``    ``\$out` `.= numToWords(((int)(``\$n` `/ 1000) % 100), ``"thousand "``);`` ` `    ``// handles digit at hundreds places (if any)``    ``\$out` `.= numToWords(((int)(``\$n` `/ 100) % 10), ``"hundred "``);`` ` `    ``if` `(``\$n` `> 100 && ``\$n` `% 100)``        ``\$out` `.= ``"and "``;`` ` `    ``// handles digits at ones and tens``    ``// places (if any)``    ``\$out` `.= numToWords((``\$n` `% 100), ``""``);`` ` `    ``return` `\$out``;``}`` ` `// Driver code`` ` `// long handles upto 9 digit no``// change to unsigned long long int to``// handle more digit number``\$n` `= 438237764;`` ` `// convert given number in words``echo` `convertToWords(``\$n``) . ``"\n"``;`` ` `// This code is contributed by Akanksha Rai``?>`

Output:
```forty three crore eighty two lakh thirty seven
thousand seven hundred and sixty four
```

Complexity Analysis:

• Time complexity: O(1).
The loop runs for a constant amount of time.
• Auxiliary space: O(1).
As no extra space is required.

This article is contributed by Aditya Goel. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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