//Input a sentence, then return number of vowels in the sentence
#include <iostream>
using namespace std;
 
char ch(char vowel);
char isVowel (char a, char e, char i, char o, char u);
 
int main ()
 
char sentence;
char isVowel;
int number;
{
	cout<<"Enter a sentence"<<endl;
	cin>>sentence;
	cout<<"There are "<<number<<" vowels in this sentence."<<endl;
 
	return 0;
 
}
char isVowel (char a, char e, char i, char o, char u)
{
	if (ch = 0)
		return number;
	else
		return false;
}

#include <cctype>
#include <iostream>
 
bool is_vowel ( int ch )
{
  ch = std::tolower ( static_cast<unsigned char> ( ch ) );
  return ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u';
}
 
int main()
{
  char ch;
  int vowels ( 0 );
 
  std::cout<<"Enter a sentence: ";
  while ( std::cin.get ( ch ) && ch != '\n' ) {
    if ( is_vowel ( ch ) )
      ++vowels;
  }
 
  std::cout<<"The number of vowels was: "<< vowels <<std::endl;
}