如何在c ++中将字符串转换为char*？

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello World";
    const char* charPtr = str.c_str();
    std::cout << charPtr << std::endl;
    return 0;
}

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello World";
    const char* charPtr = str.data();
    std::cout << charPtr << std::endl;
    return 0;
}

#include <iostream>
#include <cstring>

int main() {
    std::string str = "Hello World";
    char charArr[20];
    strcpy(charArr, str.c_str());
    std::cout << charArr << std::endl;
    return 0;
}