Count Number of Digits in a Number Python

We will discuss how to count the number of digits in a number python. We are counting the number of digits using the native method, math module, len() function, and recursive method.

Example of count number of digits in a number:-
Number = 24601
Number of Digits = 5

How to count digits in python

We will take a number while declaring the variable. Then, count the number of digits in a number using the while loop. It iterated until the test expression num > 0 is evaluated. Get each digit of the number and increment the count each time a digit is obtained. The value of num will be 0 and the loop is terminated. Finally, printing the value of the number of digits in a number.

# Python program to count number of digits in a number

# take input
num = int(input('Enter any number: '))

# count number of digits
count = 0
while (num>0):
    num = num//10
    count = count+1
    
# printing number of digits
print('Number of digits:', count)

Output for the different input values:-

Enter any number: 54689
Number of digits: 5

Enter any number: 4654979784946
Number of digits: 13

Enter any number: 00684
Number of digits: 3

Length of integer in Python

In this program, we are using len() and str() function to count the number of digits in a number. The str() is to convert the number into a string and the len() is to find the length of the string.

# Python program to count number of digits in a number

# take input
num = int(input('Enter any number: '))

# count number of digits
count = len(str(num))
    
# printing number of digits
print('Number of digits:', count)

Output:-

Enter any number: 24428050
Number of digits: 8

Python Program to Count Number of Digits in a Number

First, we will be importing the math module. Python’s math module provides log10(logarithm of base 10) to count the number of digits of positive numbers.

# Python program to count number of digits in a number

# importing math module
import math

# take input
num = int(input('Enter any number: '))

# count number of digits
count = math.floor(math.log10(num)+1)
    
# printing number of digits
print('Number of digits:', count)

Output:-

Enter any number: 04641105101
Number of digits: 10

Number of Digits in a Number in Python using Recursion

We can also use the recursion technique to count the number of digits in a number. A technique of defining the method/function that contains a call to itself is called recursion. The recursive function/method allows us to divide the complex problem into identical single simple cases that can handle easily.

# Python program to count number of digits in a number

# Function for count number of digits
count = 0
def count_Digits(num):
    global count
    if(num > 0):
        count = count + 1
        count_Digits(num // 10)
    return count

# take input
num = int(input('Enter any number: '))
    
# printing number of digits
print('Number of digits:', count_Digits(num))

Output:-

Enter any number: 124647
Number of digits: 6

Also See:- Sum of Digits of a Number in Python

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