#include <stdio.h>
#include <math.h>
 
// Function declaration
int isArmstrong(int num);
 
int main() {
    int number;
 
    // Input number
    printf("Enter a number: ");
    scanf("%d", &number);
 
    // Function call and result display
    if (isArmstrong(number))
        printf("%d is an Armstrong number.\n", number);
    else
        printf("%d is not an Armstrong number.\n", number);
 
    return 0;
}
 
// Function definition
int isArmstrong(int num) {
    int original = num;
    int sum = 0, remainder, digits = 0, temp;
 
    // Count number of digits
    temp = num;
    while (temp != 0) {
        digits++;
        temp /= 10;
    }
 
    // Calculate sum of powers of digits
    temp = num;
    while (temp != 0) {
        remainder = temp % 10;
        sum += pow(remainder, digits);
        temp /= 10;
    }
 
    // Compare the sum with the original number
    if (sum == original)
        return 1;  // Armstrong
    else
        return 0;  // Not Armstrong
}