The compiler is commonly called c++ the C compiler is traditionally called cc. The output is compiled to an executable called a.out

[andrew@sqlzoo2 andrew]$ c++ Hello.cpp
[andrew@sqlzoo2 andrew]$ ./a.out
Hello World!

The C# compiler is likely to be within the c:\WINDOWS\Microsoft.NET\Framework folder The result is an executable file Hello.exe

C:\>\WINDOWS\Microsoft.NET\Framework\v2.0.50215\csc.exe Hello.csc
Microsoft (R) Visual C# 2005 Compiler version 8.00.50215.44
for Microsoft (R) Windows (R) 2005 Framework version 2.0.50215
Copyright (C) Microsoft Corporation 2001-2005. All rights reserved.


C:\>Hello
Hello world

C:\>

The java compiler is javac, it takes a .java file and creates a .class file. The .class file is executed by the java command.

[andrew@sqlzoo2 andrew]$ /opt/jdk1.5.0_03/bin/javac Hello.java
[andrew@sqlzoo2 andrew]$ /opt/jdk1.5.0_03/bin/java Hello
Hello world

The compile stage is pretty much hidden away by the system in perl.

[andrew@sqlzoo2 andrew]$ /usr/bin/perl Hello.pl
Hello world