#include<iostream>
#include<cctype>
#include<fstream>
using namespace std;
bool isVowel(char letter)
{
	letter = tolower(letter);
	switch (letter)
	{
	case 'a': case 'e': case 'i': case 'o': case 'u':
		return true;
	}
	return false;
}
int main()
{
	ifstream inFile;
	inFile.open("text.txt");
	if (!inFile)
	{
		cout << "Error opening file";
		return 1;
	}
	int count = 0,totalcount = 0;
	char readIt;
	inFile >> readIt;
	while (!inFile.eof())
	{
		if (toupper(readIt) >= 'A' &&
			toupper(readIt) <= 'Z')
		{
			totalcount++;
			if (isVowel(readIt))
				count++;
		}
		
		inFile >> readIt;
	}
	cout << "percentage of vowels: "<< 
		count * 100.0 / totalcount ;
}