Presents a program written in USCD Pascal that simulates a system routine. Illustrates standard and user defined boolean and string functions and string procedures. Details the processing operations. (CW)

Proposes to modify the procedure proposed by Abelson and diSessa to produce a polygonal path with vertices that lie exactly on an ellipse. Provides a detailed proof. Implements a limiting process to produce the best possible approximation to any ellipse for any given screen resolution. (CW)

New computer software for physics, mathematics, computer science, and statistics courses at North Carolina State University and in some high schools allows students to solve problems on the computer, recording every answer submitted to provide faculty with a record of student performance, and providing immediate feedback to students. Computerized…