#include <ctype.h>
#include <stdio.h>
#include <string.h>
 
int vowel_count(char my_sen[])
{
  int wcount = 0; // number of words with 3+ vowel chars
  int vcount = 0; // current number of vowel chars in the current word
  int i = 0; // index into the string
  int ch;
  while ((ch = my_sen[i++]) != '\0')
  {
    if (isspace(ch) || !isalpha(ch))
    {
      // ch is not an alphabetical char, which can happen either
      // before a word or after a word.
      // If it's after a word, the running vowel count can be >= 3
      // and we need to count this word in.
      wcount += vcount >= 3; // add 1 to wcount if vcount >= 3
      vcount = 0; // reset the running vowel counter
      continue; // skip spaces and non-alphabetical chars
    }
    if (strchr("aeiouAEIOU", ch) != NULL) // if ch is one of these
    {
      ++vcount; // count vowels
    }
  }
  // If my_sen[] ends with an alphabetical char,
  // which belongs to the last word, we haven't yet
  // had a chance to process its vcount. We only
  // do that in the above code when seeing a non-
  // alphabetical char following a word, but the
  // loop body doesn't execute for the final ch='\0'.
  wcount += vcount >= 3; // add 1 to wcount if vcount >= 3
  return wcount;
}
 
int main(void)
{
  char sen[] = "CONSTITUTION: We the People of the United States...";
  printf("# of words with 3+ vowels in \"%s\" is %d", sen, vowel_count(sen));
  return 0;
}
 

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