1. Introduction to Application Programming
Introduction to Application Programming
IST 256
Application Programming for Information Systems
Xiaozhong Liu

2. Mario player = new Mario(); //hit a special brick
Mario problem
Mario player = new Mario();
//hit a special brick
if (player.status.equals(“small”)) {
show_mushroom(); }
else {
show_flower();

3. Mario problem Mario player = new Mario(); //Mario change
if (get_mushroom()) {
player.status = “big”; }
if (get_flower()){
player.status = “shoot”;
if (get_hurt() && player.status.equals(“big”)) {
player.status = “small”;
if (get_hurt() && player.status.equals(“small”)) {
player.status = “die”;

4. Example 1 If your age > 20, serve you wine; else, serve you soda…
int age;
String drink;
age = ??;
if (age > 20) {
drink = “wine”; }
else {
drink = “soda”;
System.out.println(drink);

5. System.out.println(result);
Sum of: ………
int result = 0;
result = result + 1;
result = result + 2;
result = result + 3; ……
result = result + 100;
System.out.println(result);

6. for (int i = 0; i <= 100; i = i + 1) { result = result + i; }
Sum of: ………
int result;
result = 0;
for (int i = 0; i <= 100; i = i + 1) {
result = result + i; }
System.out.println(result);

7. Example int i = 1 result = result + i; i ++ yes i <= 100? no
Initialization
int i = 1
Loop Body
Increment
result = result + i;
i ++
yes
Condition?
yes
i <= 100? no no

8. result = result + number; } System.out.println(number);
Sum of: ……….. + ???
Result more than 1000
int result = 0;
int number = 0;
while (result < 1000) {
number = number + 1;
result = result + number; }
System.out.println(number);

9. Compare for (int i = 0; i <= 100; i = i + 1) { result = result + i;}
while (result < 1000) {
number = number + 1;
result = result + number; }

10. For or While? Compute 25! (factorial)
2. Save $1000 in the bank, interest rate is 3.5%. How many years total = $1800
3. Send messages to your facebook friends automatically