Display Armstrong Numbers Between Two Intervals

1#include <stdio.h>
2#include <math.h>
3
4int countDigits(int num) {
5    int count = 0;
6    while (num != 0) {
7        num /= 10;
8        count++;
9    }
10    return count;
11}
12
13int isArmstrong(int num) {
14    int original = num;
15    int n = countDigits(num);
16    int sum = 0;
17    
18    while (num != 0) {
19        int digit = num % 10;
20        sum += (int)pow(digit, n);
21        num /= 10;
22    }
23    
24    return sum == original;
25}
26
27int main() {
28    int low, high;
29    
30    printf("Enter lower limit: ");
31    scanf("%d", &low);
32    printf("Enter upper limit: ");
33    scanf("%d", &high);
34    
35    printf("\nArmstrong numbers between %d and %d:\n", low, high);
36    
37    int found = 0;
38    for (int i = low; i <= high; i++) {
39        if (isArmstrong(i)) {
40            printf("%d ", i);
41            found = 1;
42        }
43    }
44    
45    if (!found) {
46        printf("None found");
47    }
48    printf("\n");
49    
50    return 0;
51}