Lab 7¶
Title: Relational and Logical Operators; Selection Using If and Switch
Expectations¶
We are expecting you to commit your work often with useful commit messages. This is helpful for you so that there are regular commits that demonstrate your progress. In case you forget to push your final commits before the deadline, at least you will get partial marks.
This means that you should commit and push your changes to the repository at least FIVE times as you work this lab (more is recommended). Repositories that have very few commits will be flagged for careful scrutiny and review, and you will definitely lose marks for this!
Q1: [7 marks] Vowel Checker¶
Write a Java program that takes a letter as input, and then checks whether the letter is a vowel (i.e., one of a, e, i, o, u) or a consonant. If the letter is not a valid alphabet character, print an error message stating so.
Q2: [7 marks] License Plate Checker¶
Assume vehicle plate numbers use the following standard:
XB-23 (any two letters followed by any two digits).
Write a Java program that reads a plate number provided by the user, and then validates the plate number by ensuring it:
Has exactly five characters
Starts with two uppercase letters, followed by a dash, and finally two digits.
Finally, print a message stating whether the plate number is valid or not.
Q3: [8 marks] Better Perimeter Checker¶
Write a Java program that validates the perimeter of a triangle.
The program should receive (from the user) the length of each of the three sides of a triangle as a double value.
Then, the values should be validated using the following criterion:
The length of all sides have a positive value
The sum of any two (out of three) sides should be greater than the remaining side.
Q4: [8 marks]¶
Write a Java program that plays the popular Rock-Paper-Scissors game against the computer.
The rules of the game are:
Scissor can cut paper,
Rock can knock scissors,
Paper can wrap a rock
The program should randomly generate a number 0, 1, or 2 representing rock, paper, and scissors.
The program prompts the user to enter a number 0, 1, or 2 and displays a message indicating whether the user or the computer wins, loses, or forces a tie.
Q5: [10 marks]¶
Write a Java program that reads a user’s salary (double) and marital status (single character: S for single or M for married) then displays the taxes according to the rules in the table below.
For example, a married person whose salary is $40,000 should pay $12,000 in taxes (i.e. 30% of $40,000).
Display an error message if the user enters an input that doesn’t start with M or S. When reading the marital status, extract the first character from the user’s input.
For example, all of these inputs count as married: “M”, “m”, “married”, “Married”, “M_any_characters “;
For example, all these inputs count as single: “S”, “s”, “single”, “Single”, ” S_any_characters “.
