Programming assignment #4: grada | Computer Science homework help
2
of
2
This program processes user input using a
Scanner
. You should handle the following two special cases of input:
•
A student can
receive extra credit on an
individual assignment
, but
the total points for homework are capped at the
maximum
possible
. For example,
a student
who
earns
4
1
/
4
0,
3
9
/
4
0, and
4
7
/
4
0 on three assignments
, and
25
/
3
0
on
section
attendance
will
receive
150
homework points (the max) even though they earned
15
2
.
Sections points ar
e capped at
3
0.
•
Cap exam scores at 100.
If the raw or shifted exam score exceeds 100, a score of 100 is used.
Otherwise, you may assume the user enters
valid input
. When prompted for a value, the user will enter an integ
er in the
proper range. The user will enter a number of homework assignments
≥
1, and the sum of the three weights will be exactly
100. The weight of each category will be a non
–
negative number. Exam shifts will be
≥
0.
Development Strategy and Hints:
•
T
ackle parts of the program (midterm, homework, final exam) one at a time, rather than writing the entire program at
once. Write a bit of code, get it to compile, and test what you have so far. If you try to write large amounts of code
without attempting
to compile it, you may encounter a large list of compiler errors and/or bugs.
•
To compute homework scores, you will need to cumulatively sum not only the total points the student has earned, but
also the total points possible on all homework assignments. S
ee textbook section 4.2 about cumulative sums.
•
The homework part reads two values on one line from the
Scanner
. See the lecture slides for an example of this.
•
Many students get “cannot find symbol” compiler errors. Common mistakes include forgetting to p
ass / return a
needed value, forgetting to store a returned value into a variable, and referring to a variable by the wrong name.
•
All weighted scores and grades are printed with no more than 1 digit after the decimal point. Achieve this with a
custom meth
od or
System.out.printf
. The following code prints variable
x
rounded to the nearest tenth:
double x = 1.2345;
System.out.printf(“x is around
%.1f
in size.
n”, x); // 1.2
•
If you are getting scores of 0 regardless of what data the user types, you may have
a problem with integer division.
See Chapter 2 about types
int
and
double
, type
–
casting, and how to avoid integer division problems. If you have a
value of type
double
but need to convert it into an
int
, use a type
–
cast such as the following:
double d =
5.678;
int i = (int) d; // 5
•
Use
Math.max
and
Math.min
to constrain numbers to within a particular bound.
Style Guidelines:
For this assignment, you are limited to Java features from Ch. 1
–
4. A major part of this assignment is demonstrating that you
un
derstand parameters and return values. Use static methods, parameters, and returns for structure and to eliminate
redundancy. For full credit, use
at least 4 non
–
trivial methods
other than
main
. For reference, our solution is roughly 110
lines long (66
“substantive”), with 6 methods other than
main
, though you do not need to match this.
Like on previous assignments, you should not have
println
statements in your
main
method. Also,
main
should be a concise
summary of the overall program; main should make
calls to several of your other methods that implement the majority of the
program’s behavior. Your methods will need to make appropriate use of parameters and return values. Each method should
perform a coherent task and should not do too large a share
of the overall work. Avoid lengthy “chaining” of method calls,
where each method calls the next, no values are returned, and control does not come back to
main
. (See textbook Chapter 4’s
case study for a discussion of well
–
designed versus poorly designed
methods.)
This document describes several numbers that are important to the overall program. For full credit,
you should make at least
one of such numbers into a class constant
so that the constant could be changed and your program would adapt.
When hand
ling numeric data, you are expected to choose appropriately between types
int
and
double
. You will lose points
if you use type
double
for variables in cases where type
int
would be more appropriate.
Some of your code will use conditional execution with
if
and
if/else
statements. Part of your grade will come from using
these statements properly. Review book sections 4.1
–
4.3 about nested
if/else
statements and factoring them.
Give meaningful names to methods and variables, and use proper indentation and
whitespace. Follow Java’s naming standards
as specified in Chapter 1. Localize variables when possible; declare them in the smallest scope needed. Include meaningful
comment headers at the top of your program and at the start of each method. Limit line
lengths to 100 chars.
