SentimentAnalysisExpertSystem.cpp

#include <algorithm>
#include <cctype>
#include <climits>
#include <cmath>
#include <iostream>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;

set<string> positiveWords = {"good", "great", "happy", "excellent", "love"};
set<string> negativeWords = {"bad", "sad", "terrible", "hate", "angry"};

string classifySentiment(string sentence) {
    transform(sentence.begin(), sentence.end(), sentence.begin(), [](unsigned char ch) {
        return static_cast<char>(tolower(ch));
    });

    for (char& ch : sentence) {
        if (!isalnum(static_cast<unsigned char>(ch))) ch = ' ';
    }

    stringstream ss(sentence);
    string token;
    int score = 0;
    while (ss >> token) {
        if (positiveWords.count(token)) ++score;
        if (negativeWords.count(token)) --score;
    }

    if (score > 0) return "positive";
    if (score < 0) return "negative";
    return "neutral";
}

int main() {
    string text = "I love this excellent product";
    cout << "Sentiment: " << classifySentiment(text) << '\n';
    return 0;
}