Programming Exercises
For Chapter 2
THIS PAGE CONTAINS programming exercises based on
material from Chapter 2 of this on-line
Java textbook. Each exercise has a link to a discussion of one possible solution of that
exercise.
Exercise 2.1:
Write a program that will print your initials to standard output in
letters that are nine lines tall. Each big letter should be made up of
a bunch of *'s. For example, if your initials
were "DJE", then the output would look something like:
****** ************* **********
** ** ** **
** ** ** **
** ** ** **
** ** ** ********
** ** ** ** **
** ** ** ** **
** ** ** ** **
***** **** **********
See the solution!
Exercise 2.2:
Write a program that simulates rolling a pair of dice. You can simulate
rolling one die by choosing one of the integers 1, 2, 3, 4, 5, or 6 at
random. The number you pick represents the number on the die after it
is rolled. As pointed out in Section 5,
The expression
(int)(Math.random()*6) + 1
does the computation you need to select a random integer between 1
and 6. You can assign this value to a variable to represent one of
the dice that are being rolled. Do this twice and add the results
together to get the total roll. Your program should report the
number showing on each die as well as the total roll. For example:
The first die comes up 3
The second die comes up 5
Your total roll is 8
(Note: The word "dice" is a plural, as in "two dice."
The singular is "die.")
See the solution!
Exercise 2.3:
Write a program that asks the user's name, and then greets the user by name.
Before outputting the user's name, convert it to upper case letters.
For example, if the user's name is Fred, then the program should respond
"Hello, FRED, nice to meet you!".
See the solution!
Exercise 2.4:
Write a program that helps the user count his change. The program should
ask how many quarters the user has, then how many dimes, then how many
nickels, then how many pennies. Then the program should tell the user
how much money he has, expressed in dollars.
See the solution!
Exercise 2.5:
If you have N eggs, then you have N/12 dozen eggs, with
N%12 eggs left over. (This is essentially the definition of
the / and % operators for integers.) Write a program
that asks the user how many eggs she has and then tells the user how many
dozen eggs she has and how many extra eggs are left over.
A gross of
eggs is equal to 144 eggs. Extend your program so that it will tell the
user how many gross, how many dozen, and how many left over eggs she has.
For example, if the user says that she has 1342 eggs, then your program would
respond with
Your number of eggs is 9 gross, 3 dozen, and 10
since 1342 is equal to 9*144 + 3*12 + 10.
See the solution!
