CMSC 202 Computer Science II, Spring 2007, Section 010x

Lecture 6: Objects & Classes

Thursday 02/15, 2007

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Assigned Reading:  7.1, 7.2

Slides As Shown:

• Announcements, etc: [slide view] [print view]

• const members & methods: [slide view] [print view]

Topics Covered:

• Announcement: Section 0105 can "make up" lab.

• Answered questions about Project 1

• Recap constructors:
  • Reviewed basic use: slides.
  • Showed a quick-and-dirty program for tracing constructor calls: constructors.cpp.
  • BTW, Mr. Ellington pointed out after class that invoking the alternate constructor from the default constructor: abc(17) ; doesn't do what we thought. This creates a temporary object of type abc, initializes its data member to 17 and throws away the temporary object. It doesn't initialize the data member of the "current" object.

• const members & methods. See slides linked above.

• The built-in int type has problems with initialization and with overflow. We began a discussion of the design for a class called ReallyLongInt (dubbed by the class). Discussion will be continued next class.