16.Ex2 NumVowels.cpp

#include <string>
#include <iostream>

using namespace std;

// Find the number of character 'chToFind' in string "strInput"
int GetNumCharacters(string& strInput, char chToFind)
{
   int nNumCharactersFound = 0;

   size_t nCharOffset = strInput.find(chToFind);
   while (nCharOffset != string::npos)
   {
      ++nNumCharactersFound;

      nCharOffset = strInput.find(chToFind, nCharOffset + 1);
   }

   return nNumCharactersFound;
}

int main()
{

   cout << "Please enter a string:" << endl << "> ";
   string strInput;
   getline(cin, strInput);

   int nNumVowels = GetNumCharacters(strInput, 'a');
   nNumVowels += GetNumCharacters(strInput, 'e');
   nNumVowels += GetNumCharacters(strInput, 'i');
   nNumVowels += GetNumCharacters(strInput, 'o');
   nNumVowels += GetNumCharacters(strInput, 'u');

   // DIY: handle capitals too..

   cout << "The number of vowels in that sentence is:" << nNumVowels;

   return 0;
}