c ++ cout autocase字符串？

#include<iostream>

int main() {
    std::cout << "Hello, World!"<< std::endl;
    return 0;
}

#include<iostream>
#include<string>
#include <cctype>

std::string autocase(const std::string& str) {
    std::string result;
    bool new_word = true;
    for (char c : str) {
        if (new_word) {
            result += std::toupper(c);
            new_word = false;
        } else {
            result += std::tolower(c);
        }
        if (c == ' ') {
            new_word = true;
        }
    }
    return result;
}

int main() {
    std::string str = "hello world";
    std::string autocased_str = autocase(str);
    std::cout<< autocased_str<< std::endl;
    return 0;
}

Hello World