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Re:紧急的问题，请高手们解释(理解英語題目) [Re:kof821117]

kof821117

发贴: 31
积分: 0

于 2006-01-18 10:07

Assignment 4: A more sensible multiple copy function
(NB this was edited on Nov 11 to add a further method and on Nov 21 to add pseudocode)

make5Copy is a very inflexible way of making multiple copies. In this exercise
the makeCopy method is to be modified to make it more useful,
and a method makeCopies added that uses makeCopy to make multiple copies
an addPaper method is added as well

N B. The accessor methods getCopies() and getSheetsPaper() already written in cp02 are used to check that the Copying methods are being registered and that the number of sheets is reduced by them.

Make a new copy of the project and edit the Copier class as follows, remembering to use exactly the same name for the methods.

edit your makeCopy() to return a boolean, not an int pseudocode might be
public boolean makeCopy(String text)
should return a boolean (true or false) value.
This should be true if the copy was possible, and false if not.
It should not be possible to make a copy if there is no paper left!
declare a local boolean
assume false

if (there is paper left)
make copy
make boolean true

return boolean

create a new method to make multiple copies:
public int makeCopies(String text, int number)
This should try to make as many copies of the string as are passed to it as number
(so makeCopies("test",7) should produce 7 copies).
It should use makeCopy() to actually produce the copy.
If makeCopy() returns the boolean false,
makeCopies() should itself return an int, the number of copies still to be done.
declare a local boolean
assume true

while (there are copies to be made && boolean is true)
boolean = return value of makeCopy

if boolean is true
decrement number to be made

end while

return number of copies to be made

create a new method to increase the paper available
public int addPaper ( int n )
This should add n sheets of paper to those available provided n>0
It should return the number of sheets then available.
if n>0
numberofSheets += n ;

Testing code
The code used to test the Copier Class also uses methods previously written in Assignment 2: Note that the Copier class should still initialise the number of sheets to 10.

Copier c = new Copier();
c.testCopier();
if (c.makeCopy("makeCopy Works")) {
System.out.println("and registers copies made");
} else {
System.out.println("but doesn't register copies made correctly");
}
if (c.makeCopies("makeCopies Works", 5) == 0) {
System.out.println("and registers copies made");
} else {
System.out.println("but doesn't register copies made correctly");
}
// line below changed (for consistency only) on 22 November; output changed to match.
System.out.println("adding 1 sheet of paper: now there are " + c.addPaper(1) );
if (c.makeCopies("makeCopies Works", 8) == 3) {
System.out.println("and registers copies made, ");
System.out.println("and that there are 3 left to make");
} else {
System.out.println("but doesn't register copies made correctly");
}
System.out.println("Copies made = " + c.getCopies());
System.out.println("Sheets left = " + c.getSheetsPaper());

This should produce the output:

Copier Working
makeCopy Works
and registers copies made
makeCopies Works
makeCopies Works
makeCopies Works
makeCopies Works
makeCopies Works
and registers copies made
adding 1 sheet of paper: now there are 5
makeCopies Works
makeCopies Works
makeCopies Works
makeCopies Works
makeCopies Works
and registers copies made,
and that there are 3 left to make
Copies made = 11
Sheets left = 0

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话题树型展开

人气	标题	作者	字数	发贴时间
14294	紧急的问题，请高手们解释(理解英語題目)	kof821117	2027	2006-01-17 20:44
12050	Re:紧急的问题，请高手们解释(理解英語題目)	why	173	2006-01-18 00:04
12511	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	403	2006-01-18 02:31
11944	Re:紧急的问题，请高手们解释(理解英語題目)	why	535	2006-01-18 04:07
12548	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	2206	2006-01-18 04:31
12116	Re:紧急的问题，请高手们解释(理解英語題目)	why	680	2006-01-18 04:52
12644	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	250	2006-01-18 09:57
11952	Re:紧急的问题，请高手们解释(理解英語題目)	why	640	2006-01-18 10:11
12534	Re:紧急的问题，新的一个问题又来了，～～	kof821117	309	2006-01-18 10:03
12493	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	3610	2006-01-18 10:07
12086	Re:紧急的问题，请高手们解释(理解英語題目)	why	2950	2006-01-25 12:14
12645	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	801	2006-01-18 00:26
12047	Re:紧急的问题，请高手们解释(理解英語題目)	why	121	2006-01-18 00:32
12573	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	983	2006-01-18 00:43
12567	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	640	2006-01-18 00:45
12799	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	606	2006-01-18 00:51
11932	Re:紧急的问题，请高手们解释(理解英語題目)	why	2705	2006-01-18 01:01
12561	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	75	2006-01-18 01:06
11994	Re:紧急的问题，请高手们解释(理解英語題目)	why	259	2006-01-18 01:19
12644	Re:紧急的问题，请高手们解释(理解英語題目)	kof821117	58	2006-01-18 01:35

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