10-18-2005
Might be an interview question ...
The program might do anything from print "Hello world" to core dump (or GPF or whatever).
You won't really know until you compile it or run it and even then the result may be different depending on all sorts of factors e.g. compiler used and Operating System. And worse, it may not run in the same way twice either.
Why? Because a[2] is not declared. The syntax is valid so the C compiler will produce an executable that will reference the memory location &a+2, but that access is not legitimate. You could be changing another, unrelated variable or accessing the code section of the process, or the stack or the heap. You may even be accessing an memory area outside of your program's allotted segment.
On a small program you may not experience any problems at all, but as the program becomes larger and more complex the likelihood in encountering problems increases. Your program may not out and out crash, but may become dysfunctional for no reason that can be explained. Or unpredicatable, sometimes referred to as 'unstable'.
C is a powerful language precisely because it allows these freedoms with memory access, but bad memory management in your program is the primary risk with C too!
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gvrng(1) gvrng(1)
NAME
gvrng - An interactive, introductory programming language.
SYNTAX
gvrng [world file | program file]
DESCRIPTION
Guido van Robot is a project developed by advanced high school students for use by their peers as a learning tool and precursor to the fur-
ther study of programming with Python. It is a minimalistic programming language providing just enough syntax to help students learn the
concepts of sequencing, conditional branching, looping and procedural abstraction. It's biggest strength is that it permits this learning
in an environment that combines the thrill of problem-solving with instant visual feedback. In short, it is an interactive, introductory
programming language that is excellent for learning the basic concepts of programming, applicable in any high-level language. Best of all,
it's a whole lot of fun, too!
At this point, you are probably asking yourself, "What is GvRng, specifically?" The gist of it is that it is a robot represented by a tri-
angle on the screen that moves around in a world made up of streets and avenues, walls and "beepers", which Guido can collect or set. His
actions are completely guided by a program written by the user.
FILES
/usr/bin/gvrng
/usr/lib/gvrng
/usr/share/doc/gvrng
AUTHORS
Stas Zytkiewicz - stasz@linux.isbeter.nl
Waseem Daher - wdaher@mit.edu
Steve Howell - showell@zipcon.net
SEE ALSO
http://gvrng.sourceforge.net
Stas Zytkiewicz 1.0 09/13/2004 gvrng(1)