Lecture #6

An Introduction to Programming: Coding Decision Trees

Another Decision Tree (almost same)

Picking a Textbook.
(0) do you wish a mathematical approach?	yes	(1) a programming focus instead of theory?	yes	(3) Oh! Pascal by D. Cooper
			no	(4) Algorithmics by D. Harel
	no	(2) narrow focus instead of overview of CS?	yes	(5) Karel the Robot by R. Pattis
			no	(6) Great Ideas in CS by A. Biermann

Review Code Noting myLocation Variable
BookPick.java
BookPick.html
Using Primitive Data Types: Integers
- Other primitive types include: boolean, char, float
Example Using Integers.
Count.java, Count.html
Example Doing Multiple Tallies
Tallies.java, Tallies.html
Used Integers and Plus Operator
- All five integer operators:
  +, -, *, /, %
  
  Operator Precedence

The String Class

Declaration:
String message;
String Constant
"Good Morning World!"
String Assignment
message = "It's Friday";
String Has Many Methods for Manipulation
- Most important ones are: length(), indexOf(), substring()
int length()
int indexOf(String st)
String substring(int start, int end)
Getting String Data from the User
- Can use:
  
  message = mg.getText();
  where mg is a TextField and message is a String.
Exchanging the Contents of Two Variables
Example Doing Some String Manipulation
StringPlay.java, StringPlay.html
Add More Functions
- All Capitals ( String toUpperCase())