undefined reference to 'std::cout'

Question

Shall this be the example:

#include 
using namespace std;
int main()
{
    cout << \"Hola, moondo.\\n\";
}

It throws

Answer 1

Compile the program with:

g++ -Wall -Wextra -Werror -c main.cpp -o main.o
     ^^^^^^^^^^^^^^^^^^^^ <- For listing all warnings when your code is compiled.

as cout is present in the C++ standard library, which would need explicit linking with -lstdc++ when using gcc; g++ links the standard library by default.

With gcc, (g++ should be preferred over gcc)

gcc main.cpp -lstdc++ -o main.o