Answer / Rebat Singh

An Armstrong number is a number that is equal to the sum of its own digits raised to the power of three. Here's an example C program that checks if a given number is an Armstrong number:

```c
#include <stdio.h>

int calcSum(int n);

int main() {
int num, sum, temp;

printf("Enter a number: ");
scanf("%d", &num);

temp = num;
sum = calcSum(num);

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

return 0;
}

int calcSum(int n) {
int sum = 0, rem;

while (n != 0) {
rem = n % 10;
sum += rem * rem * rem;
n /= 10;
}

return sum;
}
```
In this code, the calcSum function calculates the sum of the digits of a given number raised to the power of three. The main function then compares the original number with the calculated sum to determine if it's an Armstrong number.

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