cout doesn't display anything in terminal

Question

I'm just trying to get my c++ code to output properly in terminal on my mac, but it doesn't show anything. I'm using xcode as a text editor, saving the file as Code.cpp, and then typing g++ Code.cpp into terminal. Before it was showing errors when my code had bugs, but now that it runs correctly it doesn't show any output. Any thoughts? Here's my code:

#include <iostream>
using namespace std;

    int main() {
        cout << "Hello World" << endl;
        return 0;

    }

Here's what I put into terminal, and it just skips down to the next line without the "Hello World" output.

jspencer$ g++ Code.cpp
jspencer$

Thanks in advance for the help!!

Answer 1

g++ is a compiler. It turns your source code into an executable program, but doesn't run it. You must run the program yourself. The default name of the program generated by g++ is a.out (for historical reasons), so you would run it as

$ ./a.out

If you want to choose a different name for your program, you use the -o option:

$ g++ Code.cpp -o myProgram
$ ./myProgram

But here's how I would write your program:

#include <iostream>
int main() {
    std::cout << "Hello World\n";
    return 0;
}

See here and here for some reasons.