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Which of the following is a valid declaration for a multi-dimensional array of `double` with 3 rows and 4 columns, where all elements are initialized to `0.0` by default?

  1. double[3][4] d;

  2. double d[3][4];

  3. double[][] d = new double[3][4];

  4. double[][] d = new double[4][3];

  5. double d[][] = { {0.0} * 3 * 4 };

Show answer & explanation

Correct answer

double[][] d = new double[3][4];

Explanation

`double[][] d = new double[3][4];` is the correct syntax for a 2D array. The other options either use wrong bracket placement or incorrect dimensions (e.g., `[4][3]` gives 4 rows, 3 columns).

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