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what is a compiler?
I've heard a lot about computer programs called compilers, but I'm not exactly clear on what they do.
Compiler - Wikipedia, the free encyclopedia
A compiler is a computer program (or set of programs) that transforms source code written in a programming language (the source language) into another computer language (the target language, often having a binary form known as object code). The most common reason for wanting to transform source code is to create an executable program.