3 Digit Armstrong Number in Python | In this post, we will discuss how to check Armstrong numbers in python with the explanation. Armstrong number is a number that when raised to the power of a number of its own digits is equal to the sum of that number.
Example of Armstrong number:-
(i) Let’s assume a number as 5, the number of digits is 1 so 5 to the power of 1 is 5 there 5 is an Armstrong number.
(ii) 371 – there are 3 digits so, each digit will be raised to 3
3*3*3 + 7*7*7 + 1*1*1 = 371. Therefore 371 is an Armstrong number.
Python Program to Check 3 Digit Armstrong Number
Armstrong number program in python for 3 digits is the condition where we find only 3 digit Armstrong numbers. Now, let’s see the algorithm for the Armstrong number in python. An algorithm is a pseudo code to solve the problem, that is it is a step-by-step procedure.
Step 1: Take a number.
Step 2: declare a variable to store the sum and initialize it to 0
Step 3: find the count of digits in the given number
Step 4: for each digit in a number multiply it to the count of digits and add it to the sum variable.
Step 5: Check whether the given number and sum is equal or not
Step 6: if both are equal then print “The number is an Armstrong number” Else print “The number is not an Armstrong number”.
# Python program to check 3 digit armstrong number
# take inputs
number = 370
# find armstrong number
temp = number
sum = 0
while temp != 0:
digits = temp % 10
sum += digits * digits * digits
temp = temp // 10
# check armstrong number or not
if sum == number:
print(number, "is a three-digit Armstrong number.")
else:
print(number, "is not a three-digit Armstrong number.")
Output:-
370 is a three-digit Armstrong number.
Any Armstrong number other than 3 digits Armstrong number will be printed as “not an Armstrong number” that is, the above code evaluates only 3 digits of Armstrong number.
In the previous program, inputs are hardcoded in the program but in this program, inputs will be provided by the user.
# Python program to check 3 digit armstrong number
# take inputs
number = int(input("Enter number: "))
# find armstrong number
temp = number
sum = 0
while temp != 0:
digits = temp % 10
sum += digits * digits * digits
temp = temp // 10
# check armstrong number or not
if sum == number:
print(number, "is a three-digit Armstrong number.")
else:
print(number, "is not a three-digit Armstrong number.")
Output for the input values test-case-1:-
Enter number: 153
153 is a three-digit Armstrong number.
Output for the input values test-case-2:-
Enter number: 5
5 is not a three-digit Armstrong number.
3 Digit Armstrong Number in Python
We can also take the help of a function to check the 3 digit Armstrong number in python. A function is a block of code that performs a specific task.
We also call it the plus perfect number, a pluperfect digital invariant. In the code, we have defined two functions digits_count() and sum() which takes a single parameter number, the first function that is digits_count(n) is defined to count the number of digits in a given number. In the function, we use the while loop to check the number of digits. Next, in the second function sum() we take n as a parameter and call digits_count() to check the number of digits in the number, then in the while loop if the number is greater than 0 we,
Step1: we find mod 10 of the number and store it in digits.
Step2: Then the number is divided by 10 and raise the individual number to the power of the number of its digits, add and store it in s
Step3: We return the s.
Step4: This process is iterated until the number is 0.
# Python program to check 3 digit armstrong number
def digits_count(n):
i = 0
while n > 0:
n //= 10
i += 1
return i
def sum(n):
i = digits_count(n)
s = 0
while n > 0:
digit = n%10
n //= 10
s += digit * digit * digit
return s
# take inputs
num = int(input("Enter number: "))
# calling function
s = sum(num)
# check armstrong number or not
if s == num:
print(num, "is a three-digit Armstrong number.")
else:
print(num, "is not a three-digit Armstrong number.")
Output for the input values test-case-1:-
Enter number: 9
9 is not a three-digit Armstrong number.
Output for the input values test-case-2:-
Enter number: 370
370 is a three-digit Armstrong number.
Output for the input values test-case-3:-
Enter number: 1634
1634 is not a three-digit Armstrong number.
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