vowels.c

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void main(void)
 {
   char letter;

   int vowel_count = 0;
  
   for (letter = 'A'; letter <= 'Z'; letter++)
     switch (letter) {
       case 'A':
       case 'E':
       case 'I':
       case 'O':
       case 'U': vowel_count++;
     };
 
   printf("The number of vowels is %d/n", vowel_count);
 }