ITSS 3312 Object-Oriented Programming

Programming in Java

Homework 1

IMPORTANT NOTES:

In Eclipse IDE, Students should create a new project named: HOMEWORK_1

Problem 1:

Write a Java program that can calculate and print out the area of a square. The user enters data of the side and its measurement unit (in for inch, ft for feet, cm for centimeter, and m for meter) from the console. The program should check to be sure that the side is not negative and the measurement unit must be one among the listed-above units.

Important Notes:

Assumed that the user makes mistakes at most once for the side value and once for the measurement unit while entering the data, i.e. he/she enters the correct value the next time right after being warned. In Eclipse IDE, inside the newly created project HOMEWORK_1, students should create a new program, i.e. a class, named: Program_1 under a new package named PROBLEM_1 for his/her work on this problem. To submit, students copy all the code of the program into a Notepad file (and keep all the original Eclipse format) NOT Microsoft Words, NOT Wordpad, name the file as hw1_program1 (the file should have the suffix .txt),

Problem 2: can also use if else statements

Write a program that can convert an integer between 0 and 15 into hex number (including 0 and 15). The user enters an integer from the console and the program displays the corresponding hex number. If the user enters an integer out of range, the program displays a warning message about the invalid input.

Table. Conversion between Decimal and Hexadecimal

Decimal

Hexadecimal

0

0

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

A

11

B

12

C

13

D

14

E

15

F

Important Notes:

Assumed that the user makes mistakes at most once while entering the data, i.e. he/she enters the correct value the next time right after being warned. In Eclipse IDE, inside the newly created project HOMEWORK_2, students should create a new program, i.e. a class, named: Program_2 under a new package named PROBLEM_2 for his/her work on this problem. To submit, students copy all the code of the program into a Notepad file (and keep all the original Eclipse format) NOT Microsoft Words, NOT Wordpad, name the file as hw1_program2 (the file should have the suffix .txt)

Problem 3:

The consumer loan department of a bank asks a software analyst to write a Java program that can calculate the following amounts of a loan:

the monthly payment of a mortgage the total payment (after all the monthly payments have been made) the total interest (after all the monthly payments have been made)

After reading (from the console) necessary data the loan amount, the loan period (in months), and the annual interest rate, the program processes the data and prints out (to the console) the following pieces of information in only one line:

The loan amount The loan period (how many months) The annual interest rate ^^^ put these 3 numbers in the same line (use d or f but no s) use when u do this (this info could be for the next step below, *check w/ professor*

Then the program prints out the monthly payment in the next line, and prints out the following pieces of information in another line:

The total payment The total interest

The inputs must be verified to be sure that they are not negative. All the floating-point numbers of the outputs have 2 digits after the floating point.

Important Notes:

Annual interest rate is entered as percentage, i.e. 4.25 is entered for 4.25%

Formula to compute the monthly payment:

Formula to compute the monthly interest rate (in this formula, interest rate has it real value, not %. To get real value, divide the input of interest rate by 100)

Monthly interest rate = annual interest rate / 12

Formula to compute the total payment

Total payment = monthly payment * number of months

Formula to compute the total interest

Total interest = total payment - original loan amount

Important Notes:

In Eclipse IDE, inside the newly created project HOMEWORK_1, students should create a new program, i.e. a class, named: Program_3 under a new package named PROBLEM_3 for his/her work on this problem. To submit, students copy all the code of the program into a Notepad file (and keep all the original Eclipse format) NOT Microsoft Words, name the file as hw1_Program3 (the file should have the suffix .txt)

Problem 4:

The consumer loan department of a bank asks a software analyst to write a Java program that can calculate

the monthly payment of a mortgage the principal paid in each monthly payment the interest paid in each monthly payment,

After reading (from the console) necessary data the loan amount, the loan period (in months), and the annual interest rate, the program processes the data and then prints out (to the console) the following pieces of information as follows:

The loan amount in the 1st line The loan period (how many months) in the 2nd line The annual interest rate in the 3rd line

(Leave the next line blank)

Next, the program prints out the following text as shown:

Payment #:Monthly PaymentPrincipalInterestBalance

And finally the program prints out the following details of a monthly payment (one line for each payment)

Payment # Monthly payment amount Principal paid in the monthly payment Interest paid in the monthly payment Balance of the loan after the monthly payment

The inputs must be verified to be sure that they are not negative. All the floating-point numbers of the outputs have 2 digits after the floating point.

Sample of the outputs:

Loan amount: 10000.00

Number of months: 6

Annual interest rate: 2.00

Payment # Monthly Payment Principal Interest Balance

1 1676.40 1659.74 16.67 8340.26

2 1676.40 1662.50 13.90 6677.76

3 1676.40 1665.27 11.13 5012.49

4 1676.40 1668.05 8.35 3344.44

5 1676.40 1670.83 5.57 1673.61

6 1676.40 1673.61 2.79 0.00

Important Notes:

Formula to compute the monthly payment:

Other formulas:

Monthly interest rate = annual interest rate / 12 Interest (in monthly payment) = monthly interest rate * current balance principal (in monthly payment) = monthly payment - interest balance (after monthly payment has been paid) = current balance - principal

Important Notes:

In Eclipse IDE, inside the newly created project HOMEWORK_1, students should create a new program, i.e. a class, named: Program_4 under a new package named PROBLEM_4 for his/her work on this problem. To submit, students copy all the code of the program into a Notepad file (and keep all the original Eclipse format) NOT Microsoft Words, name the file as hw1_Program4 (the file should have the suffix .txt)