Array Creation and Access

AP Computer Science A· difficulty 2/5

int[] a;
a[0] = 1;

What is wrong?

A
$Arrays cannot be declared without size$
B
$Index 0 is reserved$
C
$Nothing is wrong$
D
$a is declared but not instantiated; you must allocate with new int[size]$
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Explanation

Declaring int[] a only creates a reference variable. You must allocate the array with a = new int[n] before assigning elements.

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