main file:
#include <iostream>
#include "testArray.cpp"
 
using namespace std;
 
int
main()
{
 
 testArray test;
 char ch;
 
 cout << "Enter a sentence:" << endl;
 
 ch = cin.get();
 
 while(ch != '\n')
 {
 test.store_char(ch);
 ch = cin.get();
 }
 
 cout << "Number of vowels: " << test.vowels() << endl;
 
 cout << "Number of digits: " << test.digits() << endl;
 
 //cout << "Number of spaces: " << test.spaces() << endl;
 
 cout << "Expression backwards: " << test.backwards() << endl;
 
 system("pause");
}
 
testArray.cpp:
#include <iostream>
#include "Array.cpp"
using namespace std;
 
class testArray:public Array
{
 protected:
          int numVowels;
          int numDigits;
          int numOther;
          //int numSpaces;
          char wordEntered;
          char numEntered;
          //char spaceEntered;
 public:
        int vowels();
        int digits();
        int spaces();
        int other();
        char backwards();  
};
 
int
testArray::vowels()
{
  numVowels = 0;
 
  for(int i = 0; i < return_size(); i++)
  {
       wordEntered = tolower(return_char(i)); 
       switch(wordEntered)
       {
        case 'a':
        case 'e':
        case 'i':
        case 'o':
        case 'u':
            numVowels++;
            break;
        default:
                numOther++;
       }
  }
       return numVowels;
 
}
 
int
testArray::digits()
{
 numDigits = 0;
 for(int i = 0; i < return_size(); i++)
 {
  numEntered = return_char(i);
  if(isdigit(numEntered))
  {   
   numDigits++;
   numOther--;
  }
 } 
 return numDigits;           
}
 
/*int
testArray::spaces()
{
 numSpaces = 0;
 for(int i = 0; i < return_size(); i++)
 {
  spaceEntered = return_char(i);
  if(spaceEntered == ' ')
   {
    numSpaces++;
    numOther--;
   }
 }*/
 
//return numSpaces;
//}
 
int 
testArray::other()
{
 return numOther;                 
}
 
char
testArray::backwards()
{
 for(int i = return_size(); i > 0; i--)
 cout << return_char(i) << endl;            
}
 
Array.cpp:
#include <iostream>
 
using namespace std;
 
class Array
{
 protected:
          char word[50];
          int size;
          int i;
          char theWord;
 public:
        Array();
        void store_char(char);
        char return_char(int);   
        int return_size(void);
};
 
Array::Array()
{
 int i;
 for(i = 0; i < 50; i++)
 word[i] = 0;             
}
 
void
Array::store_char(char userEnter)
{
 size++;
 word[i] = userEnter;
 i++;         
}     
 
char
Array::return_char(int num)
{
         theWord = word[num];
         return theWord;
}
 
int
Array::return_size()
{
 return size;
}