C++ Cookbook

1.2. Building a Simple “Hello, World” Application from the Command Line

Problem

You want to build a simple “Hello, World” program, such as that in Example 1-4.

Example 1-4. A simple “Hello, World” program

hello.cpp

#include <iostream>

int main()
{
    std::cout << "Hello, World!\n";
}

Solution

Follow these steps:

1. Set any environment variables required by your toolset.

2. Enter a command telling your compiler to compile and link your program.

Scripts for setting environment variables are listed in Table 1-5; these scripts are located in the same directory as your command-line tools (Table 1-3). If your toolset does not appear in Table 1-5, you can skip the first step. Otherwise, run the appropriate script from the command line, if you are using Windows, or source the script, if you are using Unix.

Table 1-5. Scripts for setting environment variables required by your command-line tools

Toolset	Script
Visual C++	vcvars32.bat
Intel (Windows)	iclvars.bat [2]
Intel (Linux)	iccvars.sh or iccvars.csh
Metrowerks (Mac OS X)	mwvars.sh or mwvars.csh[3]
Metrowerks (Windows)	cwenv.bat
Comeau	Same as the backend toolset
[2] With earlier version of the Intel compiler, this script was named iccvars.bat. [3] In versions of CodeWarrior prior to 10.0, there was a single csh script named mwvars.

Commands for compiling and linking hello.cpp are given in Table 1-6. To work properly, these commands require that your current directory is the directory containing hello.cpp and that the directory containing ...