CSE142 程序设计

CSE142
handout #3
CSE142—Computer Programming I
Programming Assignment #2
due: Tuesday, 1/19/21, 11 pm
This assignment will give you practice with for loops, static methods, print/println statements and a class
constant. This assignment is worth 16 points instead of the normal 20 points.
Part A: ASCII Art (2 points):
The first part of your assignment is to write a program that produces any text art (sometimes called “ASCII art”)
picture you like. Write a Java class called AsciiArt in a file called AsciiArt.java.. Your program can produce
any text picture you like, with the following restrictions and details:
• The picture should be your own creation, not an ASCII image you found on the Internet or elsewhere.
• The number of lines of output should be between 3 and 200 with no more than 100 characters per line.
• The picture should not include hateful, offensive, or otherwise inappropriate images.
• The code should use at least one for loop or static method, but should not contain infinite loops.
• The picture must not be identical to your solution for Part B or consist entirely of reused Part B code.
• Your code should not use material beyond chapter 3 of the book.
If your Part A program compiles and runs successfully and meets the above constraints, it will receive the full 2
points. Part A will not be graded on style ("internal correctness").
Part B: Rocket Ship (14 points):
In the second part of the assignment, you are going to generate output that looks like the following:
You are to exactly reproduce this output. The various subfigures in the middle of this output have a height of 3.
These subfigures have the property that their height determines their width, so there is only one size variable.
You are to use a class constant to make it possible to change a single number in one place in the program to
have it produce a corresponding figure of a different size.
This assignment is meant to give you practice with the constructs from chapters 1 and 2. This will require you
to create nested for loops with print and println statements that use the class constant. You are not to use
constructs from chapter 3 of the textbook (we will practice those in the next assignment).
You should continue to use static methods to structure your solution. As with homework 1, the main style
requirements are that you introduce static methods that capture the structure of the output and that avoid
redundancy. In particular, if there are lines of output that are repeated, the code to create them should appear
just once. You are not required to eliminate redundancy within lines of output. For example, you will notice
that in parts of the figure, the left side of the output is similar to the right side of the output, but you do not have
to try to eliminate this redundancy. You are required to properly indent your code and no line of code should be
more than100 characters long. You should localize variables whenever possible.
You should once again include a comment at the beginning of your class file with basic information about
yourself and a description of what the program does. You should also include a comment on each individual
method describing what it does. Name your file DrawRocket.java and turn in your program electronically
through the “homework” link on the class web page.
On any given execution your program will produce just one version of this figure, but it should be possible to
change the value of the program constant to have your program produce a figure of a different size. For
example, with subfigures of height 5, the output should look like this: