Python program to check the input integer number is an Armstrong number using the for loop and while loop

In this article, you will learn how to check the input integer number is an Armstrong number using the for loop and while loop in python programming.

Examples

Armstrong Number

A positive integer is called an Armstrong number (of order n) if

You should have knowledge of the following topics in python programming to understand these programs:

• Python input() function
• Python str() function
• Python int() function
• Python for loop statement
• Python while loop statement
• Python If-else condition statement
• Python print() function

1. Source Code using the for loop

# Python program to check the input integer number is an Armstrong number using the for loop

print("Enter the positive integer number:", end=" ")
x, r = str (input ()), 0

for i in x:
    r += int (i) ** len (x)

# if x is equal to r, the number is an Armstrong number
if int (r) == int (x):
    print(x, " is an Armstrong number.")
else:
    print(x, " is not an Armstrong number!")

Run Program

Output

2. Source Code using the while loop

# Python program to check the input integer number is an Armstrong number using the while loop

print("Enter the positive integer number:", end=" ")
x, r, i = str (input ()), 0, 0

while i < len (x):
    r += int (x[i]) ** len (x)
    i += 1

# if x is equal to r, the number is an Armstrong number
if int (r) == int (x):
    print(x, " is an Armstrong number.")
else:
    print(x, " is not an Armstrong number!")

Run Program

Output

Explanation

In these given programs, we have taken input 153 a positive integer number to check it is an Armstrong or not using the for loop and while loop statement.

We applied the Armstrong number formula in these loops to check the sum of its digits' multiplication with its length is equal to the given input value.