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1. Print Numbers 1–1002. Print Even Numbers in Range3. Print Odd Numbers in Range4. Sum of Digits5. Reverse Digits of a Number6. Calculate Factorial (Loop)7. Fibonacci Series8. Palindrome Number Check9. Count Digits in a Number10. GCD of Two Numbers (Loop)11. LCM of Two Numbers (Loop)12. Print Prime Numbers in Range13. Count Prime Numbers in Range14. Check Composite Number15. Power of 2 Checker16. Print Number Pattern17. Print Star Pattern18. Armstrong Numbers in Range19. Strong Numbers in Range20. Sum of Series 1/1 + 1/2 + … + 1/N21. Print Multiplication Series22. Print Pyramid Pattern23. Print Inverted Pyramid Pattern24. Print Floyd's Triangle25. Print Pascal's Triangle

Count Digits in a Number in Python

Count how many digits an integer has using a loop.

BeginnerLoop ProgramsExample 9 of 25
count-digits-in-a-number.py
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1# Program to count digits in a number
2

3num = int(input("Enter an integer: "))
4

5temp = abs(num)
6

7if temp == 0:
8    count = 1
9else:
10    count = 0
11    while temp > 0:
12        count += 1
13        temp //= 10
14

15print("Number of digits in", num, "is", count)

Output

Enter an integer: 12345
Number of digits in 12345 is 5

What's going on

We repeatedly divide by 10 until the number becomes 0, counting how many times we can do this.

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