CPS 1 - Spring, 2000 - Ramm 2/4/00 #9

Announce
- Continue to Read Course Pack Chapter 3

2. An Introduction to Programming: Coding Decision Trees

Strings and String Manipulation

Syntax Short List


 <name> ==> any string of alphanumeric symbols that begins with a letter
 <statement> ==> <name> = <expression> ;
 <statement> ==> <name> = new <class>(<arguments>);
 <statement> ==> <name>.<method>(<arguments>) | <method>(<arguments>) ;
 <arguments> == possibly empty list of <expression>s separated by commas
 <expression> ==> <string-expression> | <int-expression> | <oth-expression>
 <string-expression> ==>  <string-expression> + <string-expression>
 <string-expression> ==>  <string>
 <string> ==> " any sequence of characters "
 <string> ==> <name>

Need More: Example involving compound statement:
(assuming result5 is a string variable)
{ s = "Hello!"; k = result5;
}

More Syntax

11. <method> ==> setText | getText | getInt | setInt |
                       add | actionPerformed | init

12. <compound-statement> ==> {
                                list of <statement>s
                             }

13. <statement> ==> if (<bool-expression>)
                       <compound-statement>

14. <statement> ==> if (<bool-expression>)
                       <compound-statement>
                    else
                       <compound-statement>

Leave Syntax Study for Now

3 Numerical Computation and the Study of Functions

New Classes for Numbers
(Have used IntField)

public class IntField extends TextField
{
    public IntField();
    public IntField(int size);
    public void setInt(int number);
    public int getInt();
}
public class DoubleField extends TextField
{
    public DoubleField();
    public DoubleField(int size);
    public void setDouble(double num);
    public Double getDouble();
}

Using DoubleField in Example
Numbers.java, Numbers.html
Iteration by Button Pushing
- Can do this under control of a button
Interest Calculation Example
ButCompound.java, ButCompound.html