1. Seating “chart”
Front - Screen 3 2 4
4 rows 1 5 6
Back DOOR

2. Follow up from lab See Magic8Ball.java “solution”
Issues that you ran into.

3. Code examples Loopy.java
Loops
Code examples
Loopy.java

4. Why loops? Where have we wanted to use a loop?
What kinds of problems lend themselves to iteration?
What do Java loop structures look like?

5. 4 parts to a loop Initialization – getting it ready
Decision – Do I continue the loop – boolean expression
Body – What do I want to accomplish in a loop
Update – How do I approach the false condition to exit the loop?

6. The while loop Flowchart
statement(s)
true
boolean
expression?
false
while loops are indeterminant
loops, we execute until a condition
is met and not for any
pre – determined number of times.
while (result < 10) {
….. do something }
Another name is precondition loop – You evaluate the condition before
executing the body.

7. The while loop Flowchart
statement(s)
true
boolean
expression?
false
Another name is precondition loop – You evaluate the condition before
executing the body.

8. The while loop Flowchart
statement(s)
true
boolean
expression?
false
Another name is precondition loop – You evaluate the condition before
executing the body.

9. The while loop Flowchart
statement(s)
true
boolean
expression?
false
Another name is precondition loop – You evaluate the condition before
executing the body.

10. The do-while Loop Flowchart
statement(s)
true
boolean
expression?
false do {
… statements
} while (condition);
Another name is post condition loop – You evaluate the condition after
executing the body.

11. The do-while Loop Flowchart
statement(s)
true
boolean
expression?
false
Another name is post condition loop – You evaluate the condition after
executing the body.

12. The do-while Loop Flowchart
statement(s)
true
boolean
expression?
false
Another name is post condition loop – You evaluate the condition after
executing the body.

13. The do-while Loop Flowchart
statement(s)
true
boolean
expression?
false
Another name is post condition loop – You evaluate the condition after
executing the body.

14. The for Loop Flowchart statement(s) true boolean expression? false
update
for (int ii = 0; ii < 10; ii++) {
… statements }
In a for loop, the initialization, boolean expression and update are combined in one structure.
Another name is counted loop – You typically will execute a for loop based
on some counter. A for loop is also a precondition loop.

15. Code example Loopy.java Some terms loop control variable
precondition loop
post condition loop
counted loop