### Friday, January 1, 2016

# C program to check whether a number is an Armstrong number

```
/* Also known as narcissistic numbers,
* Armstrong numbers are the sum of their own digits
* to the power of the number of digits.
* Example: 407 = 4^3 + 0^3 + 7^3 = 407
*/
#include <stdio.h>
#include <math.h>
int main(void) {
int number_to_check = 153;
int copy_number = number_to_check;
int digits[10];
int i = 0, sum = 0, number_of_digits;
while(number_to_check!=0){
digits[i] = number_to_check % 10;
number_to_check = number_to_check/10;
i++;
}
number_of_digits = i;
for(i = number_of_digits-1; i >= 0; i--){
sum = sum + pow(digits[i], number_of_digits);
}
if(copy_number == sum)
printf("The supplied number is an armstrong number.");
else
printf("The supplied number is NOT an armstrong number.");
return 0;
}
```

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