Check For Pangram String

1#include <stdio.h>
2#include <string.h>
3#include <ctype.h>
4#include <stdbool.h>
5
6bool isPangram(char str[]) {
7    bool alphabet[26] = {false};
8    
9    for (int i = 0; str[i]; i++) {
10        if (isalpha(str[i])) {
11            alphabet[tolower(str[i]) - 'a'] = true;
12        }
13    }
14    
15    // Check if all letters present
16    for (int i = 0; i < 26; i++) {
17        if (!alphabet[i]) {
18            return false;
19        }
20    }
21    return true;
22}
23
24int main() {
25    char str1[] = "The quick brown fox jumps over the lazy dog";
26    char str2[] = "Hello World";
27    
28    printf("\"%s\"\n", str1);
29    printf("Is pangram: %s\n\n", isPangram(str1) ? "Yes" : "No");
30    
31    printf("\"%s\"\n", str2);
32    printf("Is pangram: %s\n", isPangram(str2) ? "Yes" : "No");
33    
34    return 0;
35}