Valgrind

A suite of tools used for debugging an existing program. Like Gcc, it uses a powerful debugging tool used by programmers to find breakpoints in their code.

http://valgrind.org/docs/manual/manual.html

prefix (polish) notation

Polish Notation, also known as Prefix Notation, is a form of notation that puts the operator at the beginning instead of between two numbers or other operations. Example:

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• Reference 1
• Reference 2
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Polish notation is widely used in SPARC's as a means of editing values in a stack.

ok 5 5 +
ok .c
10
ok / 2
ok .c
5
ok