# C Program to check the Number is Armstrong Number

C program to check a number is Armstrong number or not; Through this tutorial, we will learn how to check the number is armstrong number in c program using if else and function.

## Algorithm and Programs to check the Number is Armstrong Number or Not in C

Let’s use the following algorithm and program to check if a given number is armstrong number or not in c:

• Algorithm to check for Armstrong number
• C program to check a number is Armstrong number or not
• C Program to check whether a number is Armstrong number or not using function

### Algorithm to check for Armstrong number

1. Take a number as input from user and store it in an integer variable.
2. Find the cubic sum of digits of inputNumber, and store it in sum variable.
3. Compare inputNumber and sum.
4. If both are equal then input number is Armstrong number otherwise not an Armstrong number.

### C program to check a number is Armstrong number or not

```/*
* C Program to check whether a number is armstrong number or not
*/
#include <stdio.h>

int main(){
int number, sum = 0, lastDigit, temp;
printf("Enter a number : ");
scanf("%d", &number);
temp = number;

while(temp != 0){
lastDigit = temp%10;
sum = sum + (lastDigit*lastDigit*lastDigit);
temp = temp/10;
}

if(sum == number){
printf("%d is Armstrong Number \n", number);
} else {
printf("%d is not an Armstrong Number \n", number);
}

return 0;
}
```

The output of above c program; as follows:

```Enter a number : 789
789 is not an Armstrong Number```

### C Program to check whether a number is Armstrong number or not using function

```/*
* C Program to check whether a number is armstrong number or not
*/
#include <stdio.h>

int getCubicSumOfDigits(int number);
int main(){
int number, sum;
printf("Enter a number ");
scanf("%d", &number);

sum = getCubicSumOfDigits(number);

if(sum == number){
printf("%d is Armstrong Number \n", number);
} else {
printf("%d is not an Armstrong Number \n", number);
}
return 0;
}

/*
* Funtion to calculate the sum of cubes of digits of a number
* getCubicSumOfDigits(123) = 1*1*1 + 2*2*2 + 3*3*3;
*/
int getCubicSumOfDigits(int number){
int lastDigit, sum = 0;
while(number != 0){
lastDigit = number%10;
sum = sum + lastDigit*lastDigit*lastDigit;
number = number/10;
}
return sum;
}
```

The output of above c program; as follows:

```Enter a number 153
153 is Armstrong Number ```

## AuthorAdmin

Greetings, I'm Devendra Dode, a full-stack developer, entrepreneur, and the proud owner of Tutsmake.com. My passion lies in crafting informative tutorials and offering valuable tips to assist fellow developers on their coding journey. Within my content, I cover a spectrum of technologies, including PHP, Python, JavaScript, jQuery, Laravel, Livewire, CodeIgniter, Node.js, Express.js, Vue.js, Angular.js, React.js, MySQL, MongoDB, REST APIs, Windows, XAMPP, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL, and Bootstrap. Whether you're starting out or looking for advanced examples, I provide step-by-step guides and practical demonstrations to make your learning experience seamless. Let's explore the diverse realms of coding together.