Java MagicSquare, How To Check If A Multi-array Is Actually Magic ...

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5 Replies - 51 Views - Last Post: Today, 10:29 AM Rate Topic:

#1 Mamots ?

Reputation: 0

• Posts: 3
• Joined: Today, 09:53 AM

Posted Today, 09:58 AM

I'm on a book exercise Java-Illuminated-Learning-Approach, it asks me to test whether a given array is a magic square or not, my problem is that I don't know how to do the diagonal code, I re-read the book and it has nothing about it, I already implied that idea that it must be a box, and the columns and rows sum must be the same, Here's my code so far:

     public static boolean magicSquare(int[][] a) {         int sum=0;         int lastSum=0;         for (int i=0; i< a.length; i++) {             if (a.length!=a[i].length) {                 return false;             }         }         for (int i=0; i < a[0].length; i++) {             sum=0;             for (int j=0; j < a.length; j++) {                 sum+=a[i][j];             }             if (i==0) {                 lastSum=sum;             } else if (lastSum!=sum) {                 return false;             }         }         for (int i=0; i < a[0].length; i++) {             sum=0;             for (int j=0; j < a.length; j++) {                 sum+=a[j][i];             }             if (i==0) {                 lastSum=sum;             } else if (lastSum!=sum) {                 return false;             }         }          return true;     }  

And here's my array:
int[][] array = { {2,7,6},{9,5,1},{4,3,8} };
that I pass.

Thanks

Is This A Good Question/Topic? 0

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Replies To: Java MagicSquare, How to check if a multi-array is actually Magic

#2 GregBrannon ?

Reputation: 1991

• Posts: 4,846
• Joined: 10-September 10

Re: Java MagicSquare, How to check if a multi-array is actually Magic

Posted Today, 10:11 AM

What do you mean, you "don't know how to do the diagonal code?"

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#3 Mamots ?

Reputation: 0

• Posts: 3
• Joined: Today, 09:53 AM

Re: Java MagicSquare, How to check if a multi-array is actually Magic

Posted Today, 10:13 AM

GregBrannon, on 28 May 2013 - 10:11 AM, said:

What do you mean, you "don't know how to do the diagonal code?"

I need to find the sum of the diagonal numbers, for ex;

1 2 3
4 5 6
7 8 9

the answer is 1 + 5 + 9 = 15

I know the logic but I can't implement it in anyway

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#4 modi123_1 ?

Reputation: 6498

• Posts: 23,625
• Joined: 12-June 08

Re: Java MagicSquare, How to check if a multi-array is actually Magic

Posted Today, 10:20 AM

Think about it logically. If your first index in the multi-d array is the row, and the second is the column you can easily push through an array by starting at 0,0... then next would be 1,1... then next would be 2,2.. etc.

 		0	1	2 		--	--	-- 0	|	1	2	3 1	|	4	5	6 2	|	7	8	9 

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#5 GregBrannon ?

Reputation: 1991

• Posts: 4,846
• Joined: 10-September 10

Re: Java MagicSquare, How to check if a multi-array is actually Magic

Posted Today, 10:20 AM

In an array[i, j], the diagonal you've highlighted is all terms where i = j. You can create a pretty simple loop to find those elements and sum them. How many loops does it take?

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#6 Mamots ?

Reputation: 0

• Posts: 3
• Joined: Today, 09:53 AM

Re: Java MagicSquare, How to check if a multi-array is actually Magic

Posted Today, 10:29 AM

I was able to solve it by my self, I won't provide the code but you need two for loops one for going southeast and one for going southwest.. Thanks folks

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