🐍Python Program #21: Check Armstrong Number | Python Programming
🐍Python Program #21: Check Armstrong Number | Python Programming
💡 What is an Armstrong number? It's a number that equals the sum of its digits
raised to the power of the number of digits. For example, 153 → 1³+5³+3³ = 153 ✔
In this beginner-friendly tutorial, we’ll learn:
✅ The logic behind Armstrong numbers
✅ How to use loops, modulus and power operators
✅ Step-by-step Armstrong number program in Python
Perfect for practice, exams, and coding interviews!
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Logic:
1. An Armstrong number is a number that is equal to the sum of its own digits raised to the power of the number of digits.
Example: 153
→ Digits: 1, 5, 3 → 1³ + 5³ + 3³ = 1 + 125 + 27 = 153 ✔
2. Ask the user to enter a number.
3. Convert the number into string (to count digits easily).
4. Count how many digits are there → n = len(str(num)).
5. Extract digits one by one:
→ Use modulus % 10 to get last digit.
→ Raise it to the power n, add to sum.
6. Remove last digit using // 10 and repeat until num == 0.
7. Compare the sum with the original number.
→ If equal → Armstrong number
→ Else → Not Armstrong
Code:
num = 153
original = num
n = len(str(num))
result = 0
while num != 0:
digit = num % 10
result += digit ** n
num //= 10
if result == original:
print(f"{original} is an Armstrong number")
else:
print(f"{original} is NOT an Armstrong number")
👉 Perfect for Python beginners and school/college projects!
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