A Number is Armstrong Number or Not in Python
In this Python example, we will cover the program to check whether a given number is an Armstrong number or not. Let’s begin.
1. What is An Armstrong Number?
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.– WikiPedia
A given positive number is said to be an Armstrong number, if :
abcd... = an + bn + cn + dn + ...
Example: Input : 1634 Output : Yes 1*1*1*1 + 6*6*6*6 + 3*3*3*3 + 4*4*4*4 = 1634 Input : 120 Output : No 1*1*1 + 2*2*2 + 0*0*0 = 9
Some of the topics which will be helpful for understanding the program implementation better are:
2. Python Program to check Armstrong Number
In the program, we have created 3 different functions.
- The first is the function to check the Armstrong number named as
- The second is to get the order of the number named as
- The third one is to get the power of res value with order
# Python program to check Armstrong Number def get_power(a, b): if b== 0: return 1 if b % 2 == 0: return get_power(a, b // 2) * get_power(a, b // 2) return a * get_power(a, b // 2) * get_power(a, b // 2) def get_order(num): n = 0 while (num != 0): n = n + 1 num = num // 10 return n def check_Armstrong(num): n = get_order(num) temp = num sumvalue = 0 while (temp != 0): res = temp % 10 sumvalue = sumvalue + get_power(res, n) temp = temp // 10 if sumvalue == num: return "Yes, the given number is Armstrong Number" else: return "No, the given number is not Armstrong Number" num = int(input("Enter the number to check for Armstrong: ")) print(check_Armstrong(num)) if num > 0: check_Armstrong(num) else: print("Wrong input")
Output Enter the number to check for Armstrong: 153 Yes, the given number is Armstrong Number
Here, the program can check for any positive value of any order. The program is not limited to the three-digit numbers, rather it can check the number of any order.
In this article, we discussed the best way to check if a given number is an Armstrong number or not using the functions and loop.
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