Write a c program to check whether a number is Armstrong or not. In this program, we take an input number from a user and check whether an input number is Armstrong or not.

Before we start solving this problem, let's understand what is Armstrong number?

An Armstrong number is an n-digit number that is equal to the sum of the nth powers of its digits.

For example - 153 , 371 is an Armstrong number.

153 : 1

6 : 6

15 : 1

So

1634 : 1

It's an Armstrong number.

We have understood the concept, let's solve this problem.

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In this example, we first take an input number. Then we find the length of a number and then calculate the sum of a number (Which i have explained in examples). If entered number and the sum of a number is equal then it's an Armstrong number.

C program to calculate the sum of digits of a number

Output -

Enter a number : 153

153 is an Armstrong number

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Before we start solving this problem, let's understand what is Armstrong number?

## What is Armstrong number?

An Armstrong number is an n-digit number that is equal to the sum of the nth powers of its digits.

For example - 153 , 371 is an Armstrong number.

**Example 1**- 153 has 3 digits.153 : 1

^{3 }+ 5^{3 };+ 3^{3 }= 153**Example 2 -**Take an example of 6 which has 1 digit.6 : 6

^{1 }= 6 It's an Armstrong number**Example 3**- Take another example let's say 15, it has 2 digits.15 : 1

^{2}+ 5^{2}= 26So

**15 is not an Armstrong number**.**Example 4**- This time let's take bigger number 1634, it has 4 digits.1634 : 1

^{4 }+ 6^{4 }+ 3^{4 }+ 4^{4 }= 1634It's an Armstrong number.

We have understood the concept, let's solve this problem.

Program to count number of digits in a number

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## C Program to Check Whether a Number is Armstrong or Not

In this example, we first take an input number. Then we find the length of a number and then calculate the sum of a number (Which i have explained in examples). If entered number and the sum of a number is equal then it's an Armstrong number.

C program to calculate the sum of digits of a number

#include <stdio.h> #include <math.h> int main() { int num, remainder, temp, sum = 0, n = 0; //Take input number printf("Enter a number"); scanf("%d", &num); temp = num; //Find the length of a number while(temp > 0) { n++; temp = temp/10; } //Again assign temp temp = num; while(temp > 0){ remainder = temp % 10; sum = sum + pow(remainder, n); temp = temp/10; } if (num == sum){ printf("\n %d is an Armstrong number ", num); } else { printf ("\n %d is not an Armstrong number ", num); } return 0; }

Output -

Enter a number : 153

153 is an Armstrong number

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Program to check whether a number is prime or not

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