Final Exams Pt 4

Question 1

Describe the function of a while loop and compare it to a for loop

Answer 1

A while loop repeats code until a condition becomes false. In comparison with a for loop, a while loop runs an arbitrary (INCONSISTENT) number of times, while a for loop runs for a fixed number of
times.

Question 2

Write a while loop that will:
Run as long as a value equals 4

Answer 2

while (value == 4)

Question 3

Write a while loop that will:
Stop when a value equals “quit”

Answer 3

while (!value.equals (“quit”))

Question 4

Write a while loop that will:
Run while a value is more than 100 and a value is ‘y’

Answer 4

while (first > 100 && second == ’y’)

Question 5

Describe what user input is

Answer 5

1) interaction between person using program and program.
2) entering data
3) interacting with mouse
4) actions when certain keys are pressed on keyboard.

Question 6

What types of data can be entered into Processing?

Answer 6

The same types that can be declared as variables: int, float, String, char

Question 7

Write a line of code to:
Get an integer from the user and store it in a variable

Answer 7

int num = getInt(“Please enter an integer”);

Question 8

Write a line of code to:
get a float from the user and store it in a variable

Answer 8

float val = getFloat (“Enter any number”);

Question 9

Write a line of code to:
get a word from the user and store it in a variable

Answer 9

String word = getString (“Please enter a word”);

Question 10

Describe how keyboard input is different from user input above

Answer 10

1) action of pressing key.
2) doesn’t send value to be stored, but creates ACTION that calls keyboard method.

Question 11

What procedures are available for keyboard input? Briefly describe each

Answer 11

1) keyPressed() - when key is pressed
2) keyReleased() - when key is released
3) keyTyped() - when printable character is typed.

Question 12

Write code for the following:
(a) Code that draws a SQUARE whenever any key on the keyboard is pressed

Answer 12

void keyPressed(){
square(x, y, 100);
}

Question 13

Write a code for the following:
Code that will increase a variable by 2 when ‘w’ is pressed and decrease a variable by
3 when ‘s’ is pressed

Answer 13

void keyPressed(){
if(keyPressed == ‘w’){
x+=2;
}
if(keyPressed == ‘s’){
x-=3;
}
}