Accessing Characters In Strings
#include <iostream>
#include <string>
#include <cctype>
using namespace std;
int main()
{
   string text;                  
          
   cout << "Counts words. Enter a text and terminate with a period and return:\n";
   
   getline( cin, text, '.');     // Reads a text up to the first '.'

   int  i,                             // Index

        numberOfWhiteSpace = 0,        // Number of white spaces

        numberOfWords  = 0;            // Number of words

   bool fSpace = true;                 // Flag for white space
   for( i = 0; i < text.length(); ++i)
   {
      if( isspace( text[i]) )          // white space?
      {
         ++numberOfWhiteSpace;  
         fSpace = true;
      }
      else if( fSpace)                 // At the beginning of a word?
      {
         ++numberOfWords;   
         fSpace = false;
      }
   }
   cout << "\nYour text contains (without periods)"
        << "\ncharacters: " << text.length()
        << "\nwords: " << numberOfWords
        << "\nwhite spaces: " << numberOfWhiteSpace
        << endl;
   return 0;
}