# Count Number of Digits in a Number in Python Using inbuilt Method

(Last Updated On: 11/10/2023)

In this blog, we will learn how to count number of digits in a number in Python using the inbuilt method. We will break down the logic step by step, explaining each concept in simple terms. By the end of this blog, you’ll have a clear understanding of how to count digits in Python and be able to apply this knowledge to your own programs.

Have you ever wondered how to count the number of digits in a given number using Python? Whether you’re a beginner or an experienced programmer, knowing how to count digits is a fundamental skill that can come in handy for various tasks. Fortunately, Python provides us with built-in methods that make this task simple and efficient.

So, let’s dive in and discover the Python program to count the number of digits present In a number using the inbuilt method.

## Python Program to Count the Number of Digits Present In a Number Using Inbuilt Method

```# Count the Number of Digits Present In a Number Using inbuilt methods in python

num = 123456

# first convert the integer value into string by using str(). Then, we find the length of the string using len().
print(len(str(num)))
```

### Code Logic Explanation

Initialising the number

We start by initialising a variable num with a number for which we want to count the digits. In this example, let’s take num = 123456.

Converting the number to a string

To count the number of digits, we need to treat the number as a string. We can do this by using the str() function, which converts the integer value into a string. In our code, we convert num to a string using str(num).

Finding the length of the string

Once we have the number represented as a string, we can find the length of the string using the len() function. The len() function returns the number of characters (digits) in the string.

Printing the result

Finally, we print the length of the string, which corresponds to the number of digits in the original number. We achieve this by using the print() function and passing len(str(num)) as the argument.

#### Output:

The output of the code is the number of digits show within the numbers esteem ‘num’. In this case, the number esteem is ‘123456’, which has six digits. Hence, the result of the code is ‘6’.

``6``

#### We can use the following alternate methods:

Using a Loop:

We can use a loop, such as a while loop or a for loop, to repeatedly divide the number by 10 until it becomes 0, incrementing a counter variable each time. This approach involves more lines of code and requires explicit looping and conditional statements.

Converting to a List:

You can also convert the number to a list of its digits using list comprehension or the map() function, and then find the length of the list. This method involves converting the number to a list and may require additional memory for storing the list.

In this blog, we used the len() function as it is a straightforward and easy approach. It involves fewer lines of code and is easier to understand and implement. The code also becomes more readable and self-explanatory. The string conversion method is more maintainable as it requires minimal changes if you want to adapt the code for counting digits in a different context or modify it for other similar requirements. This method is generally efficient enough for most scenarios, however for extremely large numbers, other approaches might offer better performance.

### Conclusion

In this blog, the code snippet we discussed provides a simple and effective way to count the number of digits in a given number using Python’s built-in methods. By converting the number to a string and finding the length of the string, we can easily determine the number of digits present in the number. This approach is straightforward and can be applied to various scenarios where digit counting is required.

Q: What is the need to count the number of digits in a number?

A: Counting the number of digits can be useful in various scenarios, such as validating the length of a user’s input, performing mathematical operations on individual digits, or solving programming challenges that involve digit manipulation.

Q: Can this method count the number of digits in both positive and negative numbers?

A: Yes, the method can count the number of digits in both positive and negative numbers. The absolute value of the number is considered, and the negative sign is not counted as a digit.

Q: What happens if I provide a floating-point number as input?

A: If you provide a floating-point number as input, the code will convert it to a string and count the total number of characters, including the decimal point and any decimal places. To count only the digits before the decimal point, you may need to modify the code.

Q: Does the code handle invalid inputs, such as non-numeric characters?

A: No, the provided code assumes a valid numeric input. If you try to count the digits in a non-numeric value, it may result in an error. It’s important to handle input validation separately if necessary.

Q: Can we use this code to count the number of digits in a string?

A: No, this specific code snippet is designed to count the number of digits in a numerical value. If you want to count the characters in a string, you can directly use the len() function without converting it to a string.