David Goldberg, a pioneer of genetic algorithm, published the Pascal code for genetic algorithm in chapter 3 of his book. The pascal code is a small part of his code to optimize the gas pipeline for gas industries. The code he wrote, has been famous with the name Simple Genetic Algorithm (SGA), which
has been extensively used for getting started with genetic programming. I have converted the SGA originally written Pascal to another high level programming language, like C, C++ or java. There are a lot of version of conversions of this classic code in many languages, the most famous is from Dr. Goldberg's own laboratory @ http://www.illigal.uiuc.edu/web/source-code.

Download My version of SGA