Array CS Thinking Example 4

Follow the full solution, then compare it with the other examples linked below.

Example 4

medium
Given `scores = [12, 15, 9, 20]`, what are `scores[0]` and `scores[3]`, and what happens if code tries to read `scores[4]`?

Solution

  1. 1
    Step 1: Arrays usually start at index 0, so scores[0] = 12 and scores[3] = 20.
  2. 2
    Step 2: There is no fifth element, so trying to read scores[4] would cause an out-of-bounds error or an invalid/undefined result depending on the language.

Answer

scores[0] = 12, scores[3] = 20, and scores[4] is out of bounds.
Arrays store multiple values using numbered positions. Understanding zero-based indexing and valid index ranges is essential to avoid common programming errors.

About Array

An ordered collection of values stored together under a single name and accessed by their numeric index position. Arrays allow you to store, retrieve, and manipulate multiple related values efficiently using loops and index-based access.

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More Array Examples

Example 1 easy

An array `scores` contains [85, 92, 78, 95, 88]. What is scores[0]? What is scores[3]? How many elem

Example 2 medium

Write pseudocode to find the sum of all elements in an array `nums = [4, 7, 2, 9]`.

Example 3 medium

Given array `names = ['Alice', 'Bob', 'Charlie']`, what is names[1]? What happens if you access name

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