Welcome to the Java Programming Forums

The professional, friendly Java community. 21,500 members and growing!

The Java Programming Forums are a community of Java programmers from all around the World. Our members have a wide range of skills and they all have one thing in common: A passion to learn and code Java. We invite beginner Java programmers right through to Java professionals to post here and share your knowledge. Become a part of the community, help others, expand your knowledge of Java and enjoy talking with like minded people. Registration is quick and best of all free. We look forward to meeting you.

>> REGISTER NOW TO START POSTING

Members have full access to the forums. Advertisements are removed for registered users.

# Thread: Question about an exercise from D.S. Malik's Book "Java Programming"

1. ## Question about an exercise from D.S. Malik's Book "Java Programming"

I need serious and urgent help on how and what to code for the following two exercises:

Exercise 3 on P. 547

Design and implement the class Day that implements the day of the week in a program. The class Day should store the day, such as Sun for Sunday. The Program should be able to perform the following operations on an object of type Day:

a. Set the day.
b. Print the day.
c. Return the day.
d. Return the next day.
e. Return the previous day.
f. Calculate and return the day by adding certain days to the current day. For example, if the current day is Monday and we add four days, the day to be returned is Friday. Similarly, if today is Tuesday and we add 13 days, the day to be returned is Monday.
g. Add the appropriate constructors.
h. Write the definitions of the methods to implement the operations for the class Day, as defined in ‘a’ through ‘g’.
i. Write a program to test various operations on the class Day.

==================================

Exercise 9 P. 635

Programming exercise 15, in Chapter 7, asks you to find the mean and standard deviation of five numbers. Extend this programming exercise to find the mean and standard deviation of up to 100 numbers. Suppose that the mean (average) of n numbers x1, x2 … xn is x. Then the standard deviation of these numbers is:

S = √(((x_1-x)^2+ (x_2- x)^2+⋯+(x_i- x)^2+⋯+(x_n- x)^2)/n)

Please, help me with these.
Thanks

2. ## Re: Question about an exercise from D.S. Malik's Book "Java Programming"

Serious refuses to be urgent. And urgent rarely proves to be serious.

Just my (maybe jaded) 2c. But if you have an actual question, ask it: the people I've seen post here are knowledgable and generous. But what have you tried? And what happened when you tried that?

3. ## The Following User Says Thank You to pbrockway2 For This Useful Post:

copeg (April 15th, 2013)