【C++】std::string 转换成非const类型 char* 的三种方法记录

#include <iostream>
#include <string>
using namespace std;
int main()
{
   cout << "Hello World" << endl; 
   std::string test = "hello string";
   printf("%s", test.c_str());
   
   char* char_test = (char*)test.c_str();
   printf("\nchar_test: %s", char_test);
   
   char* charPointer = &test[0];
   
   printf("\ncharPointer: %s", charPointer);
   
    char* charCast = const_cast<char*>(test.c_str());
    printf("\ncharCast: %s", charCast);
   
   return 0;
}