#include <iostream>
// #include <conio.h>

// using namespace std;

int main (int argc, char** argv)
{
std::cout << "Hello, world!\n" ;
return 0;
}

main.o: In function `main':
main.cpp:(.text+0xa): undefined reference to `std::cout'
main.cpp:(.text+0xe): undefined reference to `std::cout'
main.cpp:(.text+0x1a): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
main.o: In function `__static_initialization_and_destruction_0(int, int)':
main.cpp:(.text+0x4e): undefined reference to `std::ios_base::Init::Init()'
main.cpp:(.text+0x52): undefined reference to `std::ios_base::Init::~Init()'
main.cpp:(.text+0x56): undefined reference to `std::ios_base::Init::~Init()'
collect2: выполнение ld завершилось с кодом возврата 1