A Word and Letter Counter program example

This is a very simple program but people can sometime get lost in writing them. I have not taken into account all the different error scenarios but this program is quite robust.

//Program tested on Microsoft Visual Studio 2008 - Zahid Ghadialy
//In this program we will count the total number of words, letters
//and the frequency of each letter. For simplicity we will end the
//program when enter is pressed.
#include<iostream>

using namespace std;

void wordLetterCounter(int &numWords, int &numLetters, int letterCount[]);

int main()
{
  int numWords = 0, numLetters = 0;
  int letterCount[26]={0}; //each letter count init to 0

  cout<<"\n\nPlease enter some words and finish by pressing enter : ";

  wordLetterCounter(numWords, numLetters, letterCount);

  cout<<"\n\nNumber of Words = "<<numWords<<"     Number of Letters = "<<numLetters<<endl;
  cout<<"\nFrequency of letters as follows:"<<endl;
  for(int i = 0; i < 26; i++)
  {
    cout<<char('a'+i)<<" = "<<letterCount[i]<<endl;
  }

  return 0;
}

void wordLetterCounter(int &numWords, int &numLetters, int letterCount[])
{
  char c;
  char lastLetter=' ';

  //Remember 'A'=65, 'Z'=90 and 'a'=97, 'z'=122 in Ascii
  while(cin.get(c))
  {
    //Converting upper to lower case to make it case insensitive
    if(c >= 'A' && c <= 'Z')
      c+=char(32);

    //Increase Letter Count and number of letters
    if(c >= 'a' && c <= 'z')
    {
      letterCount[c - 'a']++;
      numLetters++;
    }

    //Increase number of words
    if(c == ' ' && lastLetter != ' ')
      numWords++;

    //If new line then break;
    if(c == '\n')
    {
      //Before you exit, the numWords should be increased if there was atleast 1 letter
      if(numLetters)
        numWords++;
      break;
    }
    lastLetter = c;
  }
}

The Output is as follows. Note that there is a '.' and many spaces between Dr. and Spock but the wordcount is correct.