Spring Semester 2002 
1. 
Write a program (called One ) that prints all real solutions to the quadratic equation
a x^{2} + b x + c = 0Read in a, b, c and use the quadratic formula. If the discriminant b^{2}  4acis negative, display a message stating that there are no real solutions. 
Here's how your program should behave:
frilled.cs.indiana.edu%java One Please enter the value of a then press Enter : 1.0 Please enter the value of b then press Enter : 2.0 Please enter the value of c then press Enter : 1.0 2.0 2.0 frilled.cs.indiana.edu%java One Please enter the value of a then press Enter : 1 Please enter the value of b then press Enter : 0 Please enter the value of c then press Enter : 1 There are no solutions. frilled.cs.indiana.edu%java One Please enter the value of a then press Enter : 1 Please enter the value of b then press Enter : 2 Please enter the value of c then press Enter : 3 There are no solutions. frilled.cs.indiana.edu%java One Please enter the value of a then press Enter : 1 Please enter the value of b then press Enter : 3 Please enter the value of c then press Enter : 1 1.881966011250105 4.118033988749895 frilled.cs.indiana.edu%java One Please enter the value of a then press Enter : 0 Please enter the value of b then press Enter : 0 Please enter the value of c then press Enter : 3 3.0 is not zero frilled.cs.indiana.edu%java One Please enter the value of a then press Enter : 1 Please enter the value of b then press Enter : 0 Please enter the value of c then press Enter : 0 0.0 0.0 frilled.cs.indiana.edu%java One Please enter the value of a then press Enter : 0 Please enter the value of b then press Enter : 0 Please enter the value of c then press Enter : 0 Identity: zero == zero. frilled.cs.indiana.edu% 
2. 
Write a program (called Two ) that takes user input describing a playing card in the shorthand
notation described below, and then prints the full description of the card.
 
Here's a sample run of such a program:
frilled.cs.indiana.edu%java Two Enter the card notation: AS Ace of spades. frilled.cs.indiana.edu%java Two Enter the card notation: 2H Two of hearts. frilled.cs.indiana.edu%java Two Enter the card notation: CJ Unknown denomination of unknown colour. frilled.cs.indiana.edu%java Two Enter the card notation: JC Jack of clubs. frilled.cs.indiana.edu%java Two Enter the card notation: QK Queen of unknown colour. frilled.cs.indiana.edu%java Two Enter the card notation: QH Queen of hearts. frilled.cs.indiana.edu%java Two Enter the card notation: A D Unknown denomination of unknown colour. frilled.cs.indiana.edu%java Two Enter the card notation: A D Ace of unknown colour. frilled.cs.indiana.edu%java Two Enter the card notation: AD Ace of diamonds. frilled.cs.indiana.edu% 
3. 
Write a program (called Three ) that

Here are (essentially) all possible runs of your program:
frilled.cs.indiana.edu%java Three Please enter the value of a then press Enter : 1 Please enter the value of b then press Enter : 2 Please enter the value of c then press Enter : 3 The largest number is: 3.0 frilled.cs.indiana.edu%java Three Please enter the value of a then press Enter : 1 Please enter the value of b then press Enter : 3 Please enter the value of c then press Enter : 2 The largest number is: 3.0 frilled.cs.indiana.edu%java Three Please enter the value of a then press Enter : 2 Please enter the value of b then press Enter : 1 Please enter the value of c then press Enter : 3 The largest number is: 3.0 frilled.cs.indiana.edu%java Three Please enter the value of a then press Enter : 2 Please enter the value of b then press Enter : 3 Please enter the value of c then press Enter : 1 The largest number is: 3.0 frilled.cs.indiana.edu%java Three Please enter the value of a then press Enter : 3.0 Please enter the value of b then press Enter : 1.0 Please enter the value of c then press Enter : 2.0 The largest number is: 3.0 frilled.cs.indiana.edu%java Three Please enter the value of a then press Enter : 3.0 Please enter the value of b then press Enter : 2.0 Please enter the value of c then press Enter : 1.0 The largest number is: 3.0 frilled.cs.indiana.edu% 
4. 
Write a program (called Four )
that creates a circle with radius 100 and center (110, 120). Ask the
user to specify the x and y coordinates of a point. If the point lies
inside the circle, then show a message "Congratulations!" Otherwise, show a
message "You missed." Feel free to use, and enhance with a method
the Circle class that we developed in the second set of problems.

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Four Welcome. Circle created. Center is at: (110.0, 120.0) Radius is: 100.0 You will be asked to specify a point. First enter x, then enter y. Please enter x now: 110 Please enter y now: 120 Congratulations. frilled.cs.indiana.edu%java Four Welcome. Circle created. Center is at: (110.0, 120.0) Radius is: 100.0 You will be asked to specify a point. First enter x, then enter y. Please enter x now: 30 Please enter y now: 120 You missed. frilled.cs.indiana.edu%java Four Welcome. Circle created. Center is at: (110.0, 120.0) Radius is: 100.0 You will be asked to specify a point. First enter x, then enter y. Please enter x now: 170.98 Please enter y now: 190.05 Congratulations. frilled.cs.indiana.edu% 
5. 
Write a program (called Five )
that asks the user to specify the radii of two circles. The
first circle has center (100, 200) and the second circle has center (200, 100).
Check to see if the circles intersect. If they intersect, then display a message
"Circles intersect." Otherwise, display "Circles don't intersect."
Hint: Compute the distance between the centers and compare it to the radii.

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Five Welcome. Please specify the radius of the first circle: 10 Great. Now please specify the radius of the second circle: 10 Circles don't intersect. frilled.cs.indiana.edu%java Five Welcome. Please specify the radius of the first circle: 100 Great. Now please specify the radius of the second circle: 100 Circles intersect. frilled.cs.indiana.edu%java Five Welcome. Please specify the radius of the first circle: 70 Great. Now please specify the radius of the second circle: 71.42 Circles don't intersect. frilled.cs.indiana.edu%java Five Welcome. Please specify the radius of the first circle: 70 Great. Now please specify the radius of the second circle: 71.43 Circles intersect. frilled.cs.indiana.edu%java Five Welcome. Please specify the radius of the first circle: 140 Great. Now please specify the radius of the second circle: 1.414299 Circles don't intersect. frilled.cs.indiana.edu%java Five Welcome. Please specify the radius of the first circle: 140 Great. Now please specify the radius of the second circle: 1.4299 Circles intersect. frilled.cs.indiana.edu% 
6. 
Write a program (called Six )
that prints the question Do you want to continue?and reads the user input. If the user input is any of the following:

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Six Do you want to continue? Y OK frilled.cs.indiana.edu%java Six Do you want to continue? Yes OK frilled.cs.indiana.edu%java Six Do you want to continue? OK OK frilled.cs.indiana.edu%java Six Do you want to continue? suRe OK frilled.cs.indiana.edu%java Six Do you want to continue? Sure OK frilled.cs.indiana.edu%java Six Do you want to continue? whY nOt? OK frilled.cs.indiana.edu%java Six Do you want to continue? why not ? Bad input frilled.cs.indiana.edu%java Six Do you want to continue? N Terminating frilled.cs.indiana.edu%java Six Do you want to continue? NO Terminating frilled.cs.indiana.edu%java Six Do you want to continue? nO Terminating frilled.cs.indiana.edu%java Six Do you want to continue? No! Bad input frilled.cs.indiana.edu% 
7. 
Write a program (called Seven )
that translates a letter grade into a number grade. Letter grades are
A , B , C , D , F possibly
followed by + or  . Their numeric values are 4, 3, 2, 1, and 0.
There is no F+ or F . A + increases the numeric
value by 0.3, a  decreases it by 0.3. However an A+ has a
value of 4.0.

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Seven Enter a letter grade: A+ The numeric value is: 4.0 frilled.cs.indiana.edu%java Seven Enter a letter grade: A + Bad input. frilled.cs.indiana.edu%java Seven Enter a letter grade: U Bad input. frilled.cs.indiana.edu%java Seven Enter a letter grade: B The numeric value is: 2.7 frilled.cs.indiana.edu%java Seven Enter a letter grade: C The numeric value is: 2.0 frilled.cs.indiana.edu%java Seven Enter a letter grade: F The numeric value is: 0.0 frilled.cs.indiana.edu%java Seven Enter a letter grade: D The numeric value is: 0.7 frilled.cs.indiana.edu%java Seven Enter a letter grade:  Bad input. frilled.cs.indiana.edu% 
8. 
Write a program (called Eight )
that translates a number between 0 and 4 into the closest letter grade.
For example, the number 2.8 (which might have been the average of several grades) would
be converted to B . Break ties in favor of the better grade; for example
2.85 should be a B .

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Eight Enter numeric score then press Enter : 3.85 A frilled.cs.indiana.edu%java Eight Enter numeric score then press Enter : 3.84 A frilled.cs.indiana.edu%java Eight Enter numeric score then press Enter : 3.5 A frilled.cs.indiana.edu%java Eight Enter numeric score then press Enter : 3.49 B+ frilled.cs.indiana.edu%java Eight Enter numeric score then press Enter : 3.1 B frilled.cs.indiana.edu%java Eight Enter numeric score then press Enter : 10 A+ frilled.cs.indiana.edu%java Eight Enter numeric score then press Enter : 2 frilled.cs.indiana.edu%java Eight Enter numeric score then press Enter : 0.5 frilled.cs.indiana.edu% 
9. 
Write a program (called Nine )
that reads in three strings and sorts them lexicographically.

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Nine Enter three strings: Alpha Beta Gamma Alpha Beta Gamma frilled.cs.indiana.edu%java Nine Enter three strings: Alpha Gamma Beta Alpha Beta Gamma frilled.cs.indiana.edu%java Nine Enter three strings: Username User Use Use User Username frilled.cs.indiana.edu%java Nine Enter three strings: Alpha Alpha Alpha Alpha Alpha Alpha frilled.cs.indiana.edu%java Nine Enter three strings: Gamma gamma gama Gamma gama gamma frilled.cs.indiana.edu%java Nine Enter three strings: 10 1 2 1 10 2 frilled.cs.indiana.edu% 
10. 
A year with 366 days is called a leap year. A year is a leap year if it is divisible by 4 (for example, the year
1980), except it is not a leap year if it is divisible by 100 (for example, the year 1900); however, it is a leap
year if it is divisible by 400 (for example, the year 2000). There were no exceptions before the introduction of
the Gregorian calendar on October 15, 1582 (for example, the year 1500 was a leap year). Write a program
(called Ten )
that asks
the user for a year and computes whether that year is a leap year or not.

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Ten Please enter the year then press Enter : 1500 Leap year: 1500 frilled.cs.indiana.edu%java Ten Please enter the year then press Enter : 1900 1900 not a leap year! frilled.cs.indiana.edu%java Ten Please enter the year then press Enter : 1996 Leap year: 1996 frilled.cs.indiana.edu%java Ten Please enter the year then press Enter : 1997 1997 not a leap year! frilled.cs.indiana.edu%java Ten Please enter the year then press Enter : 2000 Leap year: 2000 frilled.cs.indiana.edu% 
11. 
Write a program (called Eleven ) that asks the user to enter a month
For February, print

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Eleven Enter a month : 1 31 days frilled.cs.indiana.edu%java Eleven Enter a month : 2 28 or 29 days frilled.cs.indiana.edu%java Eleven Enter a month : 3 31 days frilled.cs.indiana.edu%java Eleven Enter a month : 4 30 days frilled.cs.indiana.edu%java Eleven Enter a month : 5 31 days frilled.cs.indiana.edu%java Eleven Enter a month : 12 31 days frilled.cs.indiana.edu%java Eleven Enter a month : 13 Bad input frilled.cs.indiana.edu%java Eleven Enter a month : 0 Bad input frilled.cs.indiana.edu%java Eleven Enter a month : 1.2 Exception in thread "main" java.lang.NumberFormatException: 1.2 at java.lang.Integer.parseInt(Integer.java:418) at java.lang.Integer.parseInt(Integer.java:458) at ConsoleReader.readInt(Eleven.java:58) at Eleven.main(Eleven.java:7) frilled.cs.indiana.edu% 
12. 
Write a program (called Twelve ) that reads in two floatingpoint numbers and tests BOTH

Here's a sample run of such a program:
frilled.cs.indiana.edu%java Twelve Comparing floatingpoint numbers. Enter the first number : 1.3456 Enter the second number: 1.3402 1.3456 and 1.3402 are the same up to two decimal places. 1.3456 and 1.3402 are within 0.01 of one another. Thanks for asking. frilled.cs.indiana.edu%java Twelve Comparing floatingpoint numbers. Enter the first number : 2.003 Enter the second number: 1.998 2.003 and 1.998 are NOT the same up to two decimal places. 2.003 and 1.998 are within 0.01 of one another. Thanks for asking. frilled.cs.indiana.edu%java Twelve Comparing floatingpoint numbers. Enter the first number : 1.998 Enter the second number: 1.990 1.998 and 1.99 are the same up to two decimal places. 1.998 and 1.99 are within 0.01 of one another. Thanks for asking. frilled.cs.indiana.edu%java Twelve Comparing floatingpoint numbers. Enter the first number : 1.0000001 Enter the second number: 0.9999999 1.0000001 and 0.9999999 are NOT the same up to two decimal places. 1.0000001 and 0.9999999 are within 0.01 of one another. Thanks for asking. frilled.cs.indiana.edu% 
13. 
Enhance the BankAccount class by
Write a program (called 
Here's a sample run of such a program:
Notice that you are free to allow negative initial balances (resembling a loan) but the two methods that implement deposit and withdraw should behave as stated in the text of the problem (rejecting negative arguments and rejecting operations that result in a negative balance other than the initial creation of the account). If you want you can disallow initial negative balances as well.frilled.cs.indiana.edu%java Thirteen Hello, and welcome to JavaOne Bank. An account will be created for you. What will the initial balance be? Type it now: 20 The current balance in your account is: 20.0 You now want to make a deposit. How much? Type the amount here: 30 The current balance in your account is: 50.0 You now want to make a withdrawal. How much? Type it now: 100 Sorry, you cannot do that. The current balance in your account is: 50.0 Thanks for using class BankAccount. Goodbye! frilled.cs.indiana.edu%java Thirteen Hello, and welcome to JavaOne Bank. An account will be created for you. What will the initial balance be? Type it now: 20 The current balance in your account is: 20.0 You now want to make a deposit. How much? Type the amount here: 10 The current balance in your account is: 10.0 You now want to make a withdrawal. How much? Type it now: 10 Sorry, you cannot do that. The current balance in your account is: 10.0 Thanks for using class BankAccount. Goodbye! frilled.cs.indiana.edu%java Thirteen Hello, and welcome to JavaOne Bank. An account will be created for you. What will the initial balance be? Type it now: 30 The current balance in your account is: 30.0 You now want to make a deposit. How much? Type the amount here: 20 Sorry, you cannot do that. The current balance in your account is: 30.0 You now want to make a withdrawal. How much? Type it now: 40 The current balance in your account is: 10.0 Thanks for using class BankAccount. Goodbye! frilled.cs.indiana.edu% 
14.  Write a program that reads in the name and hourly wage of an employee. Then ask how many hours the employee worked in the past week. Be sure to accept fractional hours. Compute the pay. Any overtime work (over 40 hours per week) is paid at 150 percent of the regular wage. Print a paycheck for the employee. 
Here's a sample run of such a program:
Notice it's up to you what you do when the input is out of range. Also, you don't need to use the classfrilled.cs.indiana.edu%java Fourteen Please enter employee's name then press Enter : Larry Bird Please enter hourly wage then press Enter : 12.50 Please enter hours worked then press Enter: 10 Paycheck for employee Larry Bird Hours worked: 10.0 Hourly wage: 12.5 Total payment: 125.0 frilled.cs.indiana.edu%java Fourteen Please enter employee's name then press Enter : Michael Jordan Please enter hourly wage then press Enter : 10 Please enter hours worked then press Enter: 50 Paycheck for employee Michael Jordan Hours worked: 50.0 Hourly wage: 10.0 Overtime hours: 10.0 Overtime hourly wage: 15.0 Total payment: 550.0 frilled.cs.indiana.edu%java Fourteen Please enter employee's name then press Enter : Dennis Rodman Please enter hourly wage then press Enter : 2 Please enter hours worked then press Enter: 4 Paycheck for employee Dennis Rodman Hours worked: 4.0 Hourly wage: 2.0 Total payment: 8.0 frilled.cs.indiana.edu% Employee developed in the previous chapter, the emphasis is here on decisions.
