Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

126 Chapter 3 Selections
y-axis
(9, 9)
y-axis
(4, 5)
(2, 2)
(6, 4)
(0, 0)
x-axis
(0, 0)
x-axis
(a)
(b)
FIGURE 3.9
rectangle.
(a) Points inside and outside of the circle. (b) Points inside and outside of the
(Hint: A point is in the circle if its distance to (0, 0) is less than or equal to 10. The
formula for computing the distance is 2(x 2 - x 1 ) 2 + (y 2 - y 1 ) 2 . Test your program
to cover all cases.) Two sample runs are shown below.
Enter a point with two coordinates:
Point (4.0, 5.0) is in the circle
4 5
Enter a point with two coordinates: 9 9
Point (9.0, 9.0) is not in the circle
**3.23 (Geometry: point in a rectangle?) Write a program that prompts the user to enter a
point (x, y) and checks whether the point is within the rectangle centered at (0,
0) with width 10 and height 5. For example, (2, 2) is inside the rectangle and (6,
4) is outside the rectangle, as shown in Figure 3.9b. (Hint: A point is in the rectangle
if its horizontal distance to (0, 0) is less than or equal to 10 / 2 and its vertical
distance to (0, 0) is less than or equal to 5.0 / 2. Test your program to cover
all cases.) Here are two sample runs.
Enter a point with two coordinates: 2 2
Point (2.0, 2.0) is in the rectangle
Enter a point with two coordinates: 6 4
Point (6.0, 4.0) is not in the rectangle
**3.24 (Game: pick a card) Write a program that simulates picking a card from a deck of
52 cards. Your program should display the rank (Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10,
Jack, Queen, King) and suit (Clubs, Diamonds, Hearts, Spades) of the card
Here is a sample run of the program:
The card you picked is Jack of Hearts
*3.25 (Geometry: intersecting point) Two points on line 1 are given as (x1, y1) and (x2,
y2) and on line 2 as (x3, y3) and (x4, y4), as shown in Figure 3.10a–b.