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Reading figures into array of arrays and deleting them when certain values are found.  RSS feed

 
Greenhorn
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Hello I just started my first java class in college, well really my first programming class since High school true basic. And now we are on chapter 7 multidimensional array. And we have to do two project and one of them is completely over my head and somewhat confusing to me so I'm asking for your help I'm sure some of you have seen this assessment before while taking intro to java. And I found what I thing to be the complete code of the assessment online but I don't just want to copy and paste it I actually want to know what's happening step by step so that I can understand the code.


The assessment


(Financial tsunami) Banks lend money to each other. In tough economic times, if a bank goes bankrupt, it may not be able to pay back the loan. A bank’s total assets are its current balance plus its loans to other banks. The diagram in Figure 1 shows five banks. The bank’s current balances are 25, 125, 175, 75, and 181 million dollars, respectively. The directed edge from node 1 to node 2 indicates that bank 1 lends 40 million dollars to bank 2.
If a bank’s total assets are under a certain limit, the bank is unsafe. The money it borrowed cannot be returned to the lender, and the lender cannot count the loan in its total assets. Consequently, the lender may also be unsafe, if its total assets are under the limit. Write a program to find all unsafe banks. Your program reads the input as follows. It first reads two integers n and limit, where n indicates the number of banks and limit is the minimum total assets for keeping a bank safe. It then reads n lines that describe the information for n banks with IDs from 0 to n-1.
The first number in the line is the bank’s balance, the second number indicates the number of banks that borrowed money from the bank, and the rest are pairs of two numbers. Each pair describes a borrower. The first number in the pair is the borrower’s ID and the second is the amount borrowed. For example, the input for the five banks in Figure 1 is as follows (note that the limit is 201):
5 201
25 2 1 100.5 4 320.5
125 2 2 40 3 85
175 2 0 125 3 75
75 1 0 125
181 1 2 125

The total asset of bank 3 is (75 + 125), which is under 201, so bank 3 is unsafe. After bank 3 becomes unsafe, the total assets of bank 1 fall below (125 + 40). Thus, bank 1 is also unsafe. The output of the program should be
Unsafe banks are 3 1
(Hint: Use a two-dimensional array borrowers to represent loans. borrowers[i][j] indicates the loan that bank i loans to bank j. Once bank j becomes unsafe, borrows[i][j] should be set to 0.)
Figure 1 – Banks lend money to each other
125
100.5 85 75
25 125
320.5 125 40 75
181 125 175
 
Ranch Hand
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Hello Kinsgley,

Sorry about your teacher but if you need help then please post some code of what you have done so far.
If you have errors then also post those as well.

Read this page for information on how to post on the Ranch.

And Welcome to the Ranch
 
Marshal
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Welcome to the Ranch

You need to divide that task into small pieces. You do realise that using arrays of arrays, which are not multidimensional arrays, is poor, non‑object‑oriented, practice, but you are stuck with it. I suggest you start by working out how to read those numbers into your program. Simply read them and print them out. When you have got that working, you can consider the nest part.
 
Campbell Ritchie
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kingsley young wrote: . . . I found what I thing to be the complete code of the assessment online . . .
You do realise that you will receive a mark of 0 if you copy that, because of plagiarism.
 
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