[assuming this is windows]
If you read the build log that your compiler IDE outputs when you compile, it should point you towards a .exe file.
On my PC with Visual Studio 2008, it is:
<my documents>/visual studio 2008/projects/<project name>/debug/<project name>.exe.
You may be able to take that and run it on their computer. First thing to try would be to move it to another directory and run it directly from windows explorer.
There are a bunch of things I can think of that may go wrong, but a simple console app should be fine.