Quiz 1

Problem Q1.1.

[8 pts] Sketch the final appearance of the window when the computer completes the program fragment below.

Turtle mystery = new Turtle(100, 50);
int toDraw = 4;
while(toDraw > 0) {
    mystery.forward(25);
    mystery.right(60 - 60 * toDraw * (toDraw % 2));
    toDraw = toDraw - 1;
}
mystery.hide();

Problem Q1.2.

[6 pts] What Java condition belongs as the while condition (where the comment is below) so that the loop will continue until sum is no longer between −1 and 1?

Random seq;
seq = new Random();
double sum;
sum = 0.0;
while(/* condition to write */) {
    sum = sum + seq.nextDouble() - seq.nextDouble();
}

Problem Q1.3.

[6 pts] In the above program fragment, draw an oval around each variable initialization and a rectangle around each variable declaration.

Problem Q1.4.

[10 pts] List all values taken on by the variables q, r, and s as a computer executes the below Java fragment.

int q = 0;
int r = 1;
int s = 2;
while(q < 10) {
    q = r;
    r = 2 * r;
    s = s + r;
}