CSC326 Lecture 8 - CSC326 Object Oriented Programming i...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CSC326 Object Oriented Programming i CSC326 Object Oriented Programming CSC326 Object Oriented Programming ii REVISION HISTORY NUMBER DATE DESCRIPTION NAME 1.0 2011-09 JZ CSC326 Object Oriented Programming iii Contents 1 Agenda 1 2 Classes and Objects 1 3 Classes and Functions 3 4 Classes and Methods 4 5 Operator Overloading 5 6 Inheritance 6 7 Recap 7 CSC326 Object Oriented Programming 1 / 7 1 Agenda • Classes and Objects • Classes and Attributes • Classes and Methods • Operator Overloading • Inheritance 2 Classes and Objects • We have seen built-in types • User defined types: class • Example: point in 2-D space class Point( object ) : """reprsents a point in 2-D space""" • header: indicates a new class with name "Point" • header: indicates the class is a kind of "object", a built-in type • body: a docstring explaining what the class is for >>> print Point < class ’__main__.Point’ > • Class is a factory of objects – Call Point() to create instance as if it were a function – returns a "reference" to a Point object >>> blank = Point() >>> print blank <__main__.Point instance at 0xb7e9d2ac> • Note Point instance and Point class is NOT the same thing >>> print type(blank) < class ’__main__.Point’ > • Attributes – Each object has named elementes, called attributes (or fields) In – python, attribuites are introduced by use (with dot notation), not by declaration (C++) CSC326 Object Oriented Programming 2 / 7 >>> blank.x = 3.0 >>> blank.y = 4.0 >>> print blank.x 3.0 >>> distance = math.sqrt( blank.x ** 2 + blank.y ** 2) >>> print distance 5.0 • Rectangle class Rectangle( object ) : """ represent a rectangle. attributes: width, height, corner """ box = Rectangle() box.width = 100.0 box.height = 200.0 corner = Point() box.corner.x = 0.0 box.corner.y = 0.0 def find_center( box ) : p = Point() p.x = box.corner.x + box.width/2.0 p.y = box.corner.y + box.height/2.0 return p • Objects are mutable def grow_rectangle( rect, dwidth, dheight ) : rect.width = dwidth rect.height = dheight...
View Full Document

This note was uploaded on 02/20/2012 for the course CSC 326 taught by Professor Jzhu during the Fall '11 term at University of Toronto- Toronto.

Page1 / 10

CSC326 Lecture 8 - CSC326 Object Oriented Programming i...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online