通过命令行在OS X上编译简单的Hello World程序

Question

I've got a simple hello world example that I'm trying to compile on OS X, named hw.cpp :

#include <iostream>
#include <string>
using namespace std;
int main() {
  cout << "Hello world!" << endl;
  return 0;
}

I'd like to compile it using gcc , but I've had no success. I'd also like to hear the other options, like using Xcode ?

Answer 1

Try

g++ hw.cpp
./a.out

g++ is the C++ compiler frontend to GCC.
gcc is the C compiler frontend to GCC.

Yes, Xcode is definitely an option. It is a GUI IDE that is built on-top of GCC.

Though I prefer a slightly more verbose approach:

#include <iostream>

int main()
{
    std::cout << "Hello world!" << std::endl;
}

Answer 2

g++ hw.cpp -o hw
./hw

Answer 3

user@host> g++ hw.cpp
user@host> ./a.out

Answer 4

Compiling it with gcc requires you to pass a number of command line options. Compile it with g++ instead.

Answer 5

The new version of this should read like so:

xcrun g++ hw.cpp
./a.out

Answer 6

You didn't specify what the error you're seeing is.

Is the problem that gcc is giving you an error, or that you can't run gcc at all?

If it's the latter, the most likely explanation is that you didn't check "UNIX Development Support" when you installed the development tools, so the command-line executables aren't installed in your path. Re-install the development tools, and make sure to click "customize" and check that box.

Answer 7

Use the following for multiple .cpp files

g++ *.cpp
./a.out

Answer 8

此外，您可以使用像CLion（JetBrains）这样的IDE或像Atom这样的文本编辑器，使用gpp-compiler插件，就像一个魅力（F5编译和执行）。