1. CSC115 Introduction to Computer Programming
Zhen Jiang
Dept. of Computer Science
West Chester University
West Chester, PA 19383

2. Table of Contents Structure Interesting features Loop Function
Graphics
Other tools

3. Loop
Basic Idea (sequence diagram)

4. Loop Do Loop do while condition statements1 loop statements2
Do while Loop
do while condition
statements1
loop
statements2

5. No
Yes
condition
Statements1
Statements2

6. Counter Control Loop Repetition body Condition
Increment and initialization

7. Exercises
Example 1, page 165

8. How to get a result of a loop program by hand
Counter control loop: see a counter (initialization, increment, condition)
Repeat the body that many times
For each statement, check the change of variable value.

9. How to develop your own loop program
Counter control loop: know what is the body process and how many times it repeats.
Following the format of counter control loop, write down these in such an order: condition, increment, initialization.
Find the change of body for each time it repeats, compare it with the change of counter, determine the relationship of them, form the statements of body.

10. Event Control Loop
Repetition body
Event condition
Initialization

11. Exercises
Exercises 25 (with 25 students), 23, 25, page 176

12. How to get a result of an event control loop program by hand
check condition
If needs another round, repeat the body and check the change of variable value for each statement. Otherwise, stop. …
check condition and stop because the event occurs

13. How to develop your own loop program (Simple version)
Event control loop: not counter control loop
EOF

14. How to develop your own loop program
Event control loop: not counter control loop
Write down the condition to describe when the event occurs.
Write down the process body.
Write down the initialization and check the change in the process body to ensure the event will occur finally and make the condition false.

15. Do Until Loop Do
statements1
Until condition
statements2

16. Statements1 No
condition
Yes
Statements2

17. For loops

18. Exercises Exercises 18, 21, 22, page 185 Exercises 33, page 187