ex5_21.cpp

//
//  ex5_21.cpp
//  Exercise 5.21
//
//  Created by pezy on 11/9/14.
//  Copyright (c) 2014 pezy. All rights reserved.
//
//  @Brief   Revise the program from the exercise in 5.5.1(p. 191)
//           so that it looks only for duplicated words that start with an
//           uppercase letter.
//  @See     Exercise 5.20
//  @frank67 Rewrite using the 'continue' statement. See #250

#include <iostream>
using std::cin;
using std::cout;
using std::endl;

#include <string>
using std::string;

int main()
{
    string curr, prev;
    bool no_twice = false;

    while (cin >> curr) {
        if (!isupper(curr[0]))
            continue;
        if (prev == curr) {
            cout << curr << " occurs twice in succession." << endl;
            no_twice = true;
            break;
        }
        else
            prev = curr;
    }

    if (!no_twice) cout << "no word was repeated." << endl;
}