If you did not do assignment 1, you are likely to be instructor dropped from the class...
 

If you haven't already, sign up for the class mailing list.  I have already given instructions for account setup and information about project 1, in addition to having answered questions.  And only list members can view the archives.

 
You should have read Chapter 1 and part of chapter 2 by today!

We are doing Chapter 2 today...

Project 1 is posted, and due next Friday, by midnight:

http://www.cs.unm.edu/~storm/C++/cs151_summer2001/Assignment1.html

Flow of Control

More on Statements

• keyword { <one or more statements> }
• <an executable statement>
• #pre-processorDirective

Flow of Control

More on Statements

• keyword { <one or more statements> }
• keyword == if, else, while, for, do, etc...
• why the braces?

Flow of Control

More on Statements

• keyword { <one or more statements> }
• the braces actually ARE a statement...
• they group statements

Flow of Control

More on Statements

• <an executable statement>
• always ends in ';'
• can be any valid C++ statement

Flow of Control

More on Statements

• Pre-Processor Directives
• Interpreted before compilation
• always begin with '#'
• EVERYTHING from the directive to a new-line ('\n')

Flow of Control

• Expressions
• statements that evaluate to a boolean, or psuedo-boolean
• go in the parens next to the if...
• if (expression) {}

Flow of Control

• Expressions
• ==, >, <, >=, <=, !=
• Just as statements can be joined together by putting them in braces ({ }), expressions can be joined together by using && (and) and || (or)

Flow of Control

• Expressions
• &&, ||
• Need the two symbols... & and | are two entirely different operators.

Variables Revisited

• Getting the contents of a variable...
• all of the operators operate on the contents of a variable
• different types of contents of variables

Variables Revisited

• Types of variables contents
• variables contain different things based on types...
• int type or floating point types, just the number...
• string types == "something"
• char types == 'a'
• boolean types == true or false

Flow of Control

• The switch statement (case statements)
• switch (an ordinal variable) {

case value1: statement; break;
case value2: statement; break;
...
default:    statement; break;

Flow of Control

• The switch statement (case statements)
• an ordinal variable
• A variable that has an implicit order, such as an int, or char.
• Further something that has discrete values, not a double or float
• must be something that logically has cases

Flow of Control

• The switch statement (case statements)
• why statement; break;
• statement is executed, and if you don't specify break, it will simply go on and see if any of the other cases match...
• if/else if/else if/else

Flow of Control

• The switch statement (case statements)
• default keyword
• same as the else statement