Python Program to Convert a Number to Words (digit by digit)

Given a number and the task is to convert the given number into words.

For Example:

Let number = 15

The output will be = “one-five”

Implementation Tips:

Make a global list with words for each digit from 0 to 9. The entries in the list will be mapped to the index, as shown in the table below.

global list = [ ‘zero’, ‘one’, ……………’Nine’]

index: 0 1 …………….. 9

Examples:

Example1:

Input:

Given number = 15

Output:

The conversion of given number{ 15 } into words = 
one five

Example2:

Input:

Given number = 678

Output:

The conversion of given number{ 678 } into words = 
six seven eight

Program to Convert a Number to Words (digit by digit) in Python

Using Recursion (Static Input)
Using Recursion (User Input)

Method #1: Using Recursion (Static Input)

Approach:

Give the number as static input and store it in a variable.
Give the global list with words for each digit from 0 to 9 and store it in another variable.
Create a recursive function say convert_numbrtoword() which accepts the given number as an argument and returns the conversion of the given number into words.
Inside the function, check if the given number is equal to 0 using the if conditional statement.
If it is true, then return an empty string.
Else get the spelling for the last digit by giving the index of the global list as given number modulus 10 which gives the last digit of the given number.
Store it in a variable.
Add the above result and call the convert_numbrtoword() function itself by dividing the number by 10 (Recursive Logic).
Store it in another variable.
Return the above result.
Pass the given number as an argument to the above convert_numbrtoword() function and print it.
The Exit of the Program.

Below is the implementation:

# Give the global list with words for each digit from 0 to 9 and
# store it in another variable.
globl_lst = ['zero', 'one', 'two', 'three', 'four',
             'five', 'six', 'seven', 'eight', 'nine']

# Create a function say convert_numbrtoword() which accepts the given number as
# an argument and returns the conversion of the given number into words.


def convert_numbrtoword(gvn_num):

    # Inside the function, check if the given number is equal to 0 using the if
        # conditional statement.
    if(gvn_num == 0):
        # If it is true, then return an empty string.
        return ""

    else:
        # Else get the spelling for the last digit by giving the index of the global
        # list as given number modulus 10 which gives the last digit of the given
        # number.
        # Store it in a variable.
        rslt = globl_lst[gvn_num % 10]

        # Add the above result and call the convert_numbrtoword() function itself by
        # dividing the number by 10 (Recursive Logic).
        # Store it in another variable.
        fnl_rslt = convert_numbrtoword(int(gvn_num/10)) + rslt + " "

    # Return the above result.
    return fnl_rslt


# Give the number as static input and store it in a variable.
gvn_num = 15
print("The conversion of given number{", gvn_num, "} into words = ")
# Pass the given number as an argument to the above convert_numbrtoword()
# function and print it.
print(convert_numbrtoword(gvn_num))

Output:

The conversion of given number{ 15 } into words = 
one five

Method #2: Using Recursion (User Input)

Approach:

Give the number as user input using the int(input()) function.
Store it in a variable.
Give the global list with words for each digit from 0 to 9 and store it in another variable.
Create a recursive function say convert_numbrtoword() which accepts the given number as an argument and returns the conversion of the given number into words.
Inside the function, check if the given number is equal to 0 using the if conditional statement.
If it is true, then return an empty string.
Else get the spelling for the last digit by giving the index of the global list as given number modulus 10 which gives the last digit of the given number.
Store it in a variable.
Add the above result and call the convert_numbrtoword() function itself by dividing the number by 10 (Recursive Logic).
Store it in another variable.
Return the above result.
Pass the given number as an argument to the above convert_numbrtoword() function and print it.
The Exit of the Program.

Below is the implementation:

# Give the global list with words for each digit from 0 to 9 and
# store it in another variable.
globl_lst = ['zero', 'one', 'two', 'three', 'four',
             'five', 'six', 'seven', 'eight', 'nine']

# Create a function say convert_numbrtoword() which accepts the given number as
# an argument and returns the conversion of the given number into words.


def convert_numbrtoword(gvn_num):

    # Inside the function, check if the given number is equal to 0 using the if
        # conditional statement.
    if(gvn_num == 0):
        # If it is true, then return an empty string.
        return ""

    else:
        # Else get the spelling for the last digit by giving the index of the global
        # list as given number modulus 10 which gives the last digit of the given
        # number.
        # Store it in a variable.
        rslt = globl_lst[gvn_num % 10]

        # Add the above result and call the convert_numbrtoword() function itself by
        # dividing the number by 10 (Recursive Logic).
        # Store it in another variable.
        fnl_rslt = convert_numbrtoword(int(gvn_num/10)) + rslt + " "

    # Return the above result.
    return fnl_rslt


# Give the number as user input using the int(input()) function.
# store it in a variable.
gvn_num = int(input("Enter some random number = "))
print("The conversion of given number{", gvn_num, "} into words = ")
# Pass the given number as an argument to the above convert_numbrtoword()
# function and print it.
print(convert_numbrtoword(gvn_num))

Output:

Enter some random number = 678
The conversion of given number{ 678 } into words = 
six seven eight