Arrays in Programming

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Questions and Answers

What must be true about all elements in an array?

They can only store primitive data types.
They must be initialized before use.
They can be of different data types.
They must be of the same data type. (correct)

What is the consequence of using an out-of-bounds index in an array?

The program will return a default value.
The compiler will throw an error.
The program will crash consistently.
It may lead to unpredictable behavior. (correct)

Which statement correctly describes how arrays are created in C++?

Arrays can be dynamically sized at runtime.
Arrays must have a fixed size determined at compile-time. (correct)
Arrays automatically initialize their elements to zero.
Arrays require manual memory management.

How are elements in an array accessed in C++?

<p>Using square brackets [] with the index value. (B)</p> Signup and view all the answers

Which declaration correctly initializes an array of integers?

<p>int myArray[] = {1, 2, 3}; (D)</p> Signup and view all the answers

Study Notes

Arrays

Arrays are linear data structures
Used to store elements of the same data type
Arrays are created at compile-time with a fixed size
Elements are stored in contiguous memory locations

Array Declaration

int numbers[10]; declares an array named numbers to hold 10 integers
const int MAX = 10; declares a constant MAX with a value of 10
#define MAX 10 defines a pre-processor constant MAX with a value of 10

Array Initialization

By default, local arrays are not initialized
Arrays of types int, char, float etc., elements have undetermined values
Class type arrays (e.g., std::string) will have elements initialized by the class's default constructor

Array Access

Elements are accessed using the [index] notation
Indexes are 0-based, meaning the first element has an index of 0
It is the developer's responsibility to ensure indexes are within bounds
Out-of-bounds access is a runtime error that may lead to crashes

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Description

This quiz covers the fundamental concepts of arrays in programming, including their structure, declaration, initialization, and access methods. Test your understanding of how arrays function as linear data structures and the rules for working with them.