🚀 Day 35/150 – Count Digits in a Number in Python

Counting digits means finding how many digits are present in a number.

Examples:
12345 → 5 digits
900 → 3 digits
0 → 1 digit

Let’s explore different ways to count digits in Python 👇

🔹 Method 1 – Using while Loop

count = 0 while n > 0: n //= 10 count += 1  

print("Digits:", count)

 digit at a time using integer division.

🔹 Method 2 – Taking User Input

n = int(input("Enter a number: "))
count = 0

temp = abs(n)

while temp > 0:
    temp //= 10
    count += 1

print("Digits:", count)









✅ Works with negative numbers too.

🔹 Method 3 – Using String Method

n = 12345

count = len(str(abs(n)))

print("Digits:", count)

✅ Easiest and most beginner-friendly method.

🔹 Method 4 – Using Recursion

def count_digits(n): n = abs(n) if n < 10: return 1 return 1 + count_digits(n // 10) print(count_digits(12345))

✅ Great for learning recursive logic.

 🎯 Output
    Digits: 5

🔑 Key Takeaways 
Use // 10 to remove the last digit step by step.

len(str(n)) is the easiest way to count digits.

Use abs(n) to handle negative numbers.

Special case: 0 has 1 digit.