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1. Grade Calculator2. Vowel or Consonant3. Character Classification (Digit / Alpha / Special)4. Check Eligibility to Vote5. Check Divisible by 5 and 116. Check Armstrong Number7. Check Perfect Square8. Triangle Type Check9. Check Strong Number10. Check Perfect Number11. Check Automorphic Number12. Check Harshad Number13. Check Abundant Number14. Check Friendly Pair15. Compare Floating Numbers16. Menu-Driven Calculator17. Bill Discount System18. Login Authentication19. Validate Password Strength20. Validate Email Format

Check Armstrong Number in Python

Check whether a given integer is an Armstrong (narcissistic) number.

BeginnerConditional ProgramsExample 6 of 20
check-armstrong-number.py
1# Program to check Armstrong number (order 3)
2

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

5digits = str(num)
6power = len(digits)
7

8total = 0
9for d in digits:
10    total += int(d) ** power
11

12if total == num:
13    print(num, "is an Armstrong number")
14else:
15    print(num, "is not an Armstrong number")

Output

Enter an integer: 153
153 is an Armstrong number

What's going on

An Armstrong number is equal to the sum of its digits each raised to the power of the number of digits.

We convert the number to a string to iterate over digits, then compare the sum with the original number.

After this program

If the idea is still fuzzy, read Day 8: Conditional Statements in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 20 conditional programs, or see every topic on Python exercises.

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