Daca nu e prea tarziu : folosind google am gasit ceva la
http://72.14.235.104/search?q=cache:wKLqOxeX4JkJ:www.cs.uregina.ca/~dbd/cs831/notes/ml/dtrees/c4.5/tutorial.html+C4.5+algorithm+%22source+code%22&hl=ro&ct=clnk&cd=1
Gheorghe Ciubuc,SQL Server Influencer, MCP(SQL 2000), MCTS (SQL Server 2005) , OCA(Oracle 9i), Sybase(Brainbench)