Magic square java code. Java Magic Square 2d Array 2022-11-16

A magic square is a grid of numbers in which the sum of the numbers in each row, column, and diagonal is the same. It is called a "magic" square because the sum is the same no matter which direction you add up the numbers.

To create a magic square in Java, we can use a two-dimensional array to represent the grid of numbers. We can then use a loop to initialize the values in the array and to check if the square is magic.

Here is an example of how we could create a 3x3 magic square in Java:

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int[][] magicSquare = new int[3][3];

// Initialize the values in the array
for (int i = 0; i < 3; i++) {
  for (int j = 0; j < 3; j++) {
    magicSquare[i][j] = (i * 3) + (j + 1);
  }
}

// Check if the square is magic
boolean isMagic = true;
int magicSum = magicSquare[0][0] + magicSquare[1][1] + magicSquare[2][2];

for (int i = 0; i < 3; i++) {
  int rowSum = 0;
  int colSum = 0;
  for (int j = 0; j < 3; j++) {
    rowSum += magicSquare[i][j];
    colSum += magicSquare[j][i];
  }
  if (rowSum != magicSum || colSum != magicSum) {
    isMagic = false;
    break;
  }
}

if (isMagic) {
  System.out.println("This is a magic square!");
} else {
  System.out.println("This is not a magic square.");
}

In this code, we first initialize the values in the array using a nested loop. The values are set to the position of each element in the array, starting with 1 in the top left corner and increasing by one for each element to the right and down.

Next, we check if the square is magic by comparing the sum of the numbers in each row, column, and diagonal to the sum of the numbers in the first row. If any of these sums are different, we set the isMagic variable to false and break out of the loop.

Finally, we print a message indicating whether or not the square is magic.

This is just one way to create and check for a magic square in Java. There are many other ways to do it, and you can even create magic squares of different sizes by modifying the size of the array and the loop conditions.