Fundies Writing and Saving Code Lecture Notes - Edubirdie

University:
Boston University
Course:
MET CS 201 | Introduction to Programming
Academic year:

2021
Views:

430

Pages:

2
Author:

Annalise Mayer

Definintions Area (Upper) ● Writing and Saving Code ● Loading in Old Code Interactions Area (Lower) ● Results from Running Program Found Here ● Running Quick Commands to See Output string-append (combines two or more strings) string-length (counts the number of characters in the string or string-append) substring – isolates certain parts of string (substring "jonah" 1 2) = "o" Images (require 2htdp/image) ● Library of code already written that we can reference ● Overlay adds images together (one on top of the other at the center) ● Above places one image above another ● place-image lets us place one image in an arbitrary location on top of another ● Define – allows us to associate name with a certain value, function, image (0,0) is top left corner – Increasing X = to the right, Y value moves you downward Functions ● Signature – comment that describes vocabulary and syntax ● Purpose Statement – Describes the semantics Animate – In universe library (require 2htdp/universe) ● (define (name variable variable…) expression) ○ Defines a function named name. The expression is the body of the function. When the function is called, the values of the arguments are inserted into the body in place of the variables. The function returns the value of that new expression. ○ The function name’s cannot be the same as that of another function or variable. Boolean ● True = #true or #t ● False = #false or #f ● Predicate is a function that returns a Boolean value (whether or not it accepts one as as argument). ●

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