Assignment 1: First Programs!
Due Thursday, September 15th, before midnight
The goals of this assignment are:
Work with string input and output
Work with variables, expressions and operations
Get comfortable with
1. Task Tracker
Write a program,
Tasks.java that computes the time when the user will finish
their tasks. You can assume that all times are integers that represent the time
on a [24-hr "military" clock.
For example, 7 PM is 19:00, or 19, in this representation.
$ javac Tasks.java $ java Tasks Enter the current hour: 23 Enter the task duration: 5 You will finish at 4:00 o'clock. $ java Tasks Enter the current hour: 9 Enter the task duration: 5 You will finish at 14:00 o'clock.
Use modulo % to compute the completion time.
2. Calorie Tracker
Write a program called
Calories.java that computes the amount of calories
a person burns in a week while walking. On average, a person burns 100 calories
for each mile walked. Unlike the previous question, where we read data from the
console, use command-line arguments to get the number of miles walked.
$ javac Calories.java $ java Calories 3.5 You burned 350.0 calories! $ java Calories 0 You burned 0.0 calories!
Hints and requirements
Use a double to store the number of miles
System.out.printfto print the number of calories
Assume that your first command line argument (e.g. args) is a positive double!
|It’s ok if your program throws an exception if no argument is given! When this happens, you will get a runtime error. For example|
$ java Calories Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0 at Calories.main(Calories.java:3)
3. Pet Agency
You are in charge of writing a script for the Bryn Mawr Pet Adoption Agency. In
Adopt.java, write a program that will ask the user for an animal, an
integer, a noun, and and a decimal number. Your program should then use this
information to generate a short description of what the pets need at the adoption agency.
(i.e. a This question is an example of a
Here are two examples (user input in bold):
$ java Adopt.java Animal: owls Integer: 3 Noun: hats Decimal: 1.3 Welcome to the Bryn Mawr Pet Adoption Agency! We have 3 owls in need of hats and 1.3% of your love! $ java Adopt.java Animal: slugs Integer: 3000 Noun: peaches Decimal: 110.3 Welcome to the Bryn Mawr Pet Adoption Agency! We have 3000 slugs in need of peaches and 110.3% of your love!
Use either a
doublevariable to hold the decimal type
System.out.printfto print the decimal value with single precision.
4. What to hand-in
Make sure each program has a header containing your name, date, and purpose of the program
A brief write-up containing your name, assignment number, and a few sentences about how long you spent on the assignment, any customizations you made, and any interesting bugs you solved.
4.1. How to hand-in
Copy your programs to your dropbox, into the folder called