Conversion de std string a const char *

#include <string>
#include <iostream>

int main(){
  const std::string test = "plop";
  std::cout << plop.c_str() << std::endl;
  return 0;
}

std::string test = "salut";
const char* resalut = test.data();
std::cout << resalut << std::endl;

#include <sstream>
#include <iostream>

int main(){
    int x = 5;
    const char *str = "plop";
    double y = 69.28;
    std::ostringstream oss;
    oss << x << ' ' << str << '\t' << y;
    const char *res = oss.str().c_str();
    std::cout << res << std::endl;
    return 0;
}

std::string test = "salut";
const char* resalut = test.data();
std::cout << test << std::endl;