计算一个单词在文件C++中出现的次数

#include <iostream>
#include <fstream>
#include <string>

int countWordOccurrences(const std::string& filename, const std::string& targetWord) {
    std::ifstream file(filename);
    std::string line;
    int count = 0;

    while (std::getline(file, line)) {
        size_t pos = 0;
        std::string word;
        while ((pos = line.find(' ')) != std::string::npos) {
            word = line.substr(0, pos);
            if (word == targetWord) {
                count++;
            }
            line.erase(0, pos + 1);
        }
        if (line == targetWord) {
            count++;
        }
    }

    file.close();
    return count;
}

int main() {
    std::string filename = "example.cpp";
    std::string targetWord = "example";
    int occurrences = countWordOccurrences(filename, targetWord);
    std::cout << "The word \"" << targetWord << "\" occurs " << occurrences << " times in the file." << std::endl;

    return 0;
}