🔀📚Intermediate

Check Armstrong Number

Verify Armstrong property

An Armstrong number (narcissistic number) is a number equal to the sum of its digits each raised to the power of the number of digits.
Example: 153 = 1³ + 5³ + 3³ = 1 + 125 + 27 = 153

Program Code

armstrong.c

1#include <stdio.h>
2#include <math.h>
3
4int main() {
5    int num, original, remainder, digits = 0;
6    double sum = 0;
7    
8    printf("Enter a number: ");
9    scanf("%d", &num);
10    
11    original = num;
12    
13    // Count digits
14    int temp = num;
15    while (temp != 0) {
16        digits++;
17        temp /= 10;
18    }
19    
20    // Calculate sum of digits^n
21    temp = num;
22    while (temp != 0) {
23        remainder = temp % 10;
24        sum += pow(remainder, digits);
25        temp /= 10;
26    }
27    
28    if ((int)sum == original) {
29        printf("%d is an Armstrong number\n", num);
30    } else {
31        printf("%d is not an Armstrong number\n", num);
32    }
33    
34    return 0;
35}