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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     char word[100];
  5.  
  6.     printf("Enter a word: ");
  7.     scanf("%s", word);
  8.  
  9.     if (is_legal_word(word)) {
  10.         printf("'%s' is legal.\n", word);
  11.     } else {
  12.         printf("'%s' is illegal.\n", word);
  13.     }
  14.  
  15.     return 0;
  16. }
  17.  
  18.  
  19. int is_legal_word(const char *word) {
  20.     while (*word != '\0') {
  21.         char ch = tolower(*word);
  22.         if (ch == 'a' || ch == 'e' || ch == 'i' ||
  23.             ch == 'o' || ch == 'u' || ch == 'y') {
  24.             return 1;  // Legal contains at least one vowel
  25.         }
  26.         word++;
  27.     }
  28.     return 0;  // Illegal no vowels found
  29. }
  30.  
Success #stdin #stdout 0s 5324KB
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Enter a word: 'try' is legal.
https://ideone.com/osjknX
language:
C (gcc 8.3)
created:
17 hours ago
visibility:
public

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