Last element of each row not random. This algorithm is the same as the purely random algorithm
except when placing an element at the end of the row do not choose randomly but select the only element
that works based on the magic sum. Looking at the 4 Ã— 4 example above, the algorithm would have chosen
6, 10, and 7 randomly but now the only number that will work for the last spot is 11, so simply place that
number in that spot in the array. The implementation of this is going to be similar to the purely random one,
but you will need some addition code or methods to find the number for that last spot of each row. Donâ€™t
forget that it might not always be possible to find that last value. For example, suppose the first 3 random
values put in the magic square array are 2, 3, and 5. Since the magic sum of a 4 Ã— 4 array is 34 we would
need the value 24, but the largest number available is 16.
You should notice that this algorithm finds solutions much faster than the purely random one. In fact, my
purely random program only found solutions to n = 3 cases in a reasonable amount of time. n = 4 would
frequently take more than 100,000,000 tries. But n = 4 works well with this algorithm, finding solutions
quite quickly. The average number of tries necessary for this algorithm to find a magic square is just a little
Pair heuristic. This only works for cases where n is even and I will describe it for the n = 4 case. Recall
that the magic sum for an n = 4 array is 34. Put elements randomly into the rows in pairs where each pair
sums to 17, Â½ the magic sum value. For example, here is a magic square found using that algorithm.
1 12 Â 5 16 15 Â 9 Â 8 Â 2 14 Â 6 11 Â 3 Â 4 Â 7 10 13
In this case the first random value found was 5. It was randomly placed in the first row. Notice this is
different from how the other two algorithms work. 12 is the value that pairs with 5 to get to 17 so we place
12 randomly in one of the remaining open positions. The next random number found was 1 and it was placed
randomly in one of the remaining positions and then its pair, 16, was placed in the only remaining spot in the
This algorithm performs considerably better than the previous algorithm, requiring on average of only
about Â 600,000 tries to find a solution.
I look forward to your thoughts about other general algorithms that will allow us to find magic squares
for even larger nâ€™s.
Below is an outline of the class and the methods that need to be implemented for that class. Do not make
any changes to the classes, variables, names, etc. Just add code. Questions? Start or continue a Discussion.
This assignment is as much about following instructions as it is about programming. Be sure your
methods do exactly what is expected of them and all rules mentioned below and in Canvas and class
discussions are followed.
What follows are general rules that you must follow for this and, as applicable, all other programs you
write in this class. Failure to follow these rules will cost you points.
1. I will eventually post a final test program. A sample test program is already posted to help get you
started. Donâ€™t wait for my final test program to appear to start debugging your program. You should
begin testing with your own test programs. Also, the final test program I post may not be the same test
program I run on your programs. You cannot assume your program is correct just because it works on the
posted test program.
2. Submit your program through Canvas with the name prog1.java. Be sure that my main (test) program is
in a different file from your class(es) and you should not submit my test program. Also, do not make your
classes “public”. If you deviate from any of these rules you will lose points because doing so makes it
much more difficult for me to manage and test your programs.
3. The top of your prog1.java file (and all java code that you turn in to me in the future) should begin with
comments that show: (i) Your name; (ii) Comp 282 and clear mention of what time your class meets; (iii)
The assignment number; (iv) The date the assignment was handed in (which is not necessarily the same
as the due date); (v) A brief description of what is contained in the file.
4. For all Java code you turn in:
a) Choose clear and suggestive variable names.
b) Be sure lines do not wrap to the first column of the next line or disappear off the end of the page.
c) Use comments generously to describe how your methods work. Comments should appear
inside your methods, too â€“ not just at the top. That said, don’t overdo the comments.
d) There should be no more than one return statement in any method.
e) Do not use break statements to exit loops.
f) Do not use global variables. If you are not sure if you are using them, ask.
g) Programs should be 100% your own work, as stated in the syllabus
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