More Conditionals and Loops - Java Software Solutions: Foundations of Program Design - page 285

SELF-REVIEW QUESTIONS (see answers in Appendix N)
SR 6.12 When would we use a for loop instead of a while loop?
SR 6.13 What output is produced by the following code fragment?
int value = 0;
for ( int num = 10; num <= 40; num += 10)
{
value = value + num;
}
System.out.println (value);
SR 6.14 What output is produced by the following code fragment?
int value = 0;
for ( int num = 10; num < 40; num += 10)
{
value = value + num;
}
System.out.println (value);
SR 6.15 What output is produced by the following code fragment?
int value = 6;
for ( int num = 1; num <= value; num ++)
{
for ( int i = 1; i <= (value — num); i++)
System.out.print (" ");
for ( int i = 1; i <= ((2 * num) — 1); i++)
System.out.print ("*");
System.out.println ();
}
SR 6.16 Assume die is a Die object (as defined in Section 4.2). Write a code frag-
ment that will roll die 100 times and output the average value rolled.
6.5 Drawing with Loops and Conditionals
Conditionals and loops greatly enhance our ability to generate interesting graphics.
The Bullseye program shown in Listing 6.5 draws a target. The drawing actu-
ally occurs in the BullseyePanel class, shown in Listing 6.6. The paintComponent
of the BullseyePanel class uses an if statement to alternate the colors between
black and white.
Note that each ring is actually drawn as a filled circle (an oval of equal width
and length). Because we draw the circles on top of each other, the inner circles