The 2nd Forms have been working with the turtle graphics aspect of the programming language Logo. They first defined a procedure to draw a square, then used this procedure in another, rotating it around the circle. The size of the square was changed each time by editing the procedure.

First Attempts:
 

H Laing (8.06)

Z Redgrave (8.10)

J Polley (09.02)

More Advanced Work

These were from the final 2nd Form lesson. This time the boys used several procedures (short sections of programming) to produce these patterns. Other procedures were called from them, and variables were used. Success was judged by the production of a finished result by typing just one command on a blank screen. This is one advantage of using a procedure; another is that if it goes wrong is is easier to see what happens, and it can easily be corrected and then propagated to all the programs which use that procedure.

E Ingram (9.03)

J Rogers (8.05)