#include <iostream>
#include <string>

int main()
{
    using std::cout;
    using std::cin;
    using std::getline; //I assume you want spaces in your sentences
    using std::string; // can you use std::string? Or only char arrays/chars?
    using std::endl;

    
    string setence , vowels = "";
    int numVowels = 0;

    cout << "Please enter a setence: ";
    getline( cin , setence );

    for( int i = 0; setence[i]; ++i ) //loop while it is not a null character
    {
        switch( toupper(setence[i]) )
        {
            case 'A': case 'E': case 'I': case 'O': case 'U': //some times y?
            ++numVowels;
            vowels += setence[i];
        }
    }

    cout << "Number of vowels: " << numVowels << endl;
    cout << "Vowels used are: " << vowels << endl;
}