An Armstrong number (also known as a narcissistic number, pluperfect digital invariant, or pluperfect number) is a number that is the sum of its own digits each raised to the power of the number of digits. For example, 153 is an Armstrong number because:
\[1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153\]
Here's a Python program to check whether a given number is an Armstrong number or not:
```python
def is_armstrong(number):
# Convert the number to a string to find the number of digits
num_str = str(number)
num_digits = len(num_str)
# Initialize the total sum
total_sum = 0
# Calculate the sum of digits raised to the power of the number of digits
for digit_str in num_str:
digit = int(digit_str)
total_sum += digit ** num_digits
# Check if the sum is equal to the original number
return total_sum == number
# Example: Checking for Armstrong number
input_number = int(input("Enter a number: "))
if is_armstrong(input_number):
print(f"{input_number} is an Armstrong number.")
else:
print(f"{input_number} is not an Armstrong number.")
```
### Explanation:
1. The `is_armstrong` function takes an integer `number` as an argument and returns `True` if it's an Armstrong number, and `False` otherwise.
2. We convert the number to a string to find the number of digits using `len(num_str)`.
3. The function initializes `total_sum` to 0, which will store the sum of digits raised to the power of the number of digits.
4. We iterate through each digit in the number, convert it to an integer, and add it to the `total_sum` raised to the power of the number of digits.
5. Finally, we check if `total_sum` is equal to the original number. If they are equal, the number is an Armstrong number.
6. In the example, the user is prompted to enter a number using `input()`, and the `is_armstrong` function is called with the input number. The program then prints whether the number is an Armstrong number or not.
### Sample Output:
```
Enter a number: 153
153 is an Armstrong number.
```
### Conclusion:
This Python program checks whether a given number is an Armstrong number using a simple algorithm. Understanding the concept of Armstrong numbers and implementing such checks can be useful in various mathematical and programming scenarios. Feel free to experiment with different inputs to test the program's functionality. Happy coding!
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