University of Central Florida (UCF) EGN3211 Engineering Analysis and Computation Final Practice Exam

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When initializing a 2D array with int arr[2][3];, how many elements will it contain?

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When you declare a two-dimensional array in C, such as `int arr[2][3];`, it consists of rows and columns defined by the dimensions in the brackets. In this case, you have specified there will be 2 rows and 3 columns.

To calculate the total number of elements in this 2D array, you multiply the number of rows by the number of columns. Therefore, with 2 rows and 3 columns, the calculation is as follows:

2 (rows) * 3 (columns) = 6 elements.

Thus, the 2D array `arr` will indeed contain 6 elements, confirming that option A is the correct choice. This understanding is crucial in programming because knowing how many elements are actually allocated in memory can influence how you access and manipulate the array data structure effectively.

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