# Python Program to Check Armstrong Number

In this python tutorial, you will learn how to Check Armstrong Number using the if and else statement and while loop along with the different operators of the python programming language.

Armstrong number is a number that is equal to the sum of cubes of its digits. An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself.

Eg: 153 = ((1*1*1 )+ (5*5*5) + (3*3*3)) = 153

## How to Check Armstrong Number?

Let’s take a look at the source code , here the values are given as input by the user in the code, the if, else statement and while loop along with the assignment operators carry out the function.

CASE 1:

CASE 2:

```#Python Program to Check Armstrong Number
num = int(input("Enter the first integer: "))

order = len(str(num))

sum = 0

temp = num
while temp > 0:
digit = temp % 10
sum += digit ** order
temp //= 10

if num == sum:
print("\n", num,"is an Armstrong number")
else:
print("\n", num,"is not an Armstrong number")
```

CASE 1:

INPUT:

`153`

OUTPUT:

```Enter the first integer:
153 is an Armstrong number```

CASE 2:

INPUT:

`382`

OUTPUT:

```Enter the first integer:
382 is not an Armstrong number```

1. Here we give the user the option to enter the values and the input values are scanned using the `input` function and are stored in the variable `num` with the statements/strings `("Enter the first integer: ")`, we use the `int` function and declare the  input value as an integer value.
2. In the STDIN section of the code editor the input values are entered.
3. We declare the `order` and assign the condition `len(str(num))`,  where the condition is the length of the value in string format which the variable `order` holds .
4. Next, we declare the that `sum = 0`, followed by which we declare `temp = num`.
5. We open a `while` loop with the condition `temp > 0` followed by a `:`, after which we declare the condition `digit = temp % 10` and the condition `sum += digit ** order` where `temp //= 10 `.
6. In the above lines of code, the `while` loop will iterate until all the functions `digit = temp % 10`, `sum += digit ** order` and `temp //= 10` are complete and the conditions are satisfied. That is we find the modulus % of `temp` where the value of `digit` obtained is used in the next condition, these steps repeat until the condition `temp //= 10` is satisfied and the loop comes to an end.
7. After the `while` loop, we declare an `if`  statement where if the condition `num == sum` is satisfied, its displays the statement `("\n", num,"is an Armstrong number")` using the `print` function.
8. If the condition is not satisfied, it moves to the next step which is the `else`  statement where the `print` function will display the statement `("\n", num,"is an Armstrong number")`.

NOTE:

• The len() function is an inbuilt function in Python programming language that returns the length of the string.
• The While true loop in python runs without any conditions until the break statement executes inside the loop.
• The double division operator (//) is used to compute the quotient and the modulus operator (%) is used to compute the reminder.
• The Python += operator lets you add two values together and assign the resultant value to a variable
• The print statement/string to be displayed in enclosed in double quotes.
•  The integers are zero, positive or negative whole numbers without a fractional part.
• The if and else statements evaluates whether an expression is true or false. If a condition is true, the “if” statement is executed otherwise, the “else” statement is executed.
• The == equality operator is a comparison operator which returns True is the two items are equal and returns False if not equal.
• The colon : at the end of the if and else statement tells Python that the next line of code should only be run if the condition is true.
• The statement for the input function are enclosed in single quotes and parenthesis.
• The \n in the code indicates a new line or the end of a statement line or a string.
• The print statement is followed by a period, to initiate the format function.
• The print statement/string to be displayed in enclosed in double quotes.