Unit 4 Cycle 2 Day 1: Array Initialization
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Unit 4, Data Collections • Cycle 2
Day 1 Advanced Practice • Harder Difficulty
Focus: Array Initialization
Hard
Array Initialization
Advanced Practice Question
Format: Array Initialization
What is the output?
What is the output?
int[] arr = new int[5];
arr[0] = 10;
arr[2] = 20;
System.out.println(arr[1] + arr[2] + arr[4]);
Difficulty: Hard |
Topic: Array Initialization |
Cycle: 2 (Advanced)
Why This Answer?
Uninitialized int array elements default to 0. arr[1]=0, arr[2]=20, arr[4]=0. Sum = 0+20+0 = 20.
Common Mistake
Watch Out!
Thinking uninitialized array elements are undefined or cause errors.
AP Exam Strategy
Arrays auto-initialize: int=0, double=0.0, boolean=false, objects=null.
Master This Topic
This Cycle 2 HARD question tests array initialization. Review Unit 4 concepts to build mastery of data collections.
- Understanding array initialization
- Tracing code execution accurately
- Avoiding common pitfalls
Ready for More Challenges?
Cycle 2 questions prepare you for the hardest AP CSA exam questions.
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