detect_repeated_words.cpp

#include <iostream>
#include <string>

using namespace std;

// detect adjacent repeated words in a sequence of words
int main() {
    string previous = " ";      // previous word; initialized to "not a word"
    string current;             // current word
    while (cin >> current) {    // read a stream of words
        if (previous == current)    // check if the word is the same as last
            cout << "repeated word: " << current << '\n';
        previous = current;
    }
    return 0;
}