* 4.7 assignment(chpter 4) -- edited flag viewer for display button event to handle all the radio buttons and check marks

Signed-off-by: fallenangelX <noneya@hotmail.com>
* finished 5.1 assignment (chpter 5)
* also removed an unused variable

Signed-off-by: fallenangelX <noneya@hotmail.com>
* chpter 3 to 5 review questions

Signed-off-by: fallenangelX <noneya@hotmail.com>