Algorithms and Flow Charts

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Presentation transcript:

Algorithms and Flow Charts

Algorithms A procedure or formula for solving a problem. Drawing a square in Netlogo

Representation of Algorithms Desirable Features Language independent Unambiguous Easy to understand A standard---understood and known by many Solution Flow charts

Drawing a square As a flow chart:

Using variables More general?

Repetition

Repetition in Netlogo On the previous slide while ;; repeats forever loop repeat ;; repeats forever pd loop [ fd 0.5 rt 1 ] ;; the turtle draws a circle pd repeat 36 [ fd 1 rt 10 ]

Decision

Decision if else statement if statement [ ifelse (xcor > 0) [ set color blue ] [ set color red ] ] [ if (xcor > 0) [ set color blue ] ]

Procedures

Input and Output

Symbol Summary These seven symbols are used the most:

The Bug Game Implemented in Netlogo; here is the file Objective: pick up all the food and return home in the fewest moves

The Bug Game Write the procedure go using the following instructions (each instruction is actually a procedure call): turn-right turn-left move-forward dist (dist must be specified) pickup-food see-food (sets variables) see-start (sets variables) at-food (sets variables) at-start (sets variables)