disk sheduling algorithm

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Hiii friends....can anyone help me in making java and c++ programs of disk sheduling algorithms. Actually we are studying this algorithms in Operating systems subject. As a project work we have to make programs for FIFO, shortest job first, round robin and few other algorithms like SCAN, LOOK and circular SCAN....i have done half of the job i need help only for round robin and look.....if anybody knows about programming language please help.......or atleast please give me links for this programs.... Thanks