C++ Module 6: Arrays

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Questions and Answers

What is the primary purpose of an array in programming?

To store a single value of a specific data type

To store multiple values of the same data type (correct)

To store multiple values of different data types

To perform arithmetic operations

How do you declare an array in C++?

By using parentheses and specifying the number of elements

By using a semicolon and specifying the number of elements

By using square brackets and specifying the number of elements (correct)

By using curly braces and specifying the number of elements

What is the purpose of an array literal in C++?

To perform arithmetic operations on an array

To initialize an array with values (correct)

To declare an array

To access an array element

How do you access an array element in C++?

By using the array name with square brackets and the index number Signup and view all the answers

What is the index number of the first element in an array?

0 Signup and view all the answers

What is the purpose of the 'cout' statement in the example code?

To access and display an array element Signup and view all the answers

What is the data type of the array 'cars' in the example code?

String Signup and view all the answers

What is the number of elements in the array 'myNum' in the example code?

3 Signup and view all the answers

What is the characteristic of an array variable?

It has a common name identifier and can hold many values of the same data type Signup and view all the answers

What is the purpose of specifying the number of elements in an array declaration?

To determine the size of the array Signup and view all the answers

What is the advantage of using an array literal?

It provides a convenient way to initialize the array with values Signup and view all the answers

What happens when you access an array element by referring to its index number?

You get the value of the element at that index Signup and view all the answers

What is the difference between declaring an array and declaring a single variable?

Array declaration can hold multiple values, while single variable declaration can hold only one value Signup and view all the answers

What is the purpose of the 'square brackets' in an array declaration?

To specify the number of elements in the array Signup and view all the answers

How do you create an array of three integers in C++?

int myNum[3] = {10, 20, 30}; Signup and view all the answers

What is the purpose of the curly braces in an array literal?

To enclose the values of the array Signup and view all the answers

What is the advantage of using arrays in C++ programs?

It allows for storing multiple values of the same data type in a single variable Signup and view all the answers

What is the purpose of the array index number?

To access a specific element in the array Signup and view all the answers

Study Notes

Array Overview

An array is a special type of variable that can contain one or more values of the same data type.
An array has a common name identifier or variable name and can hold many values at the same time, provided they have the same data type.

Learning Outcomes

Describe the nature and purpose of an array.
Use arrays in simple C++ programs.
Declare, instantiate, and initialize arrays.
Define methods that have an array as a parameter.

Declaring an Array

To declare an array, define the variable type, specify the name of the array, and enclose the number of elements in square brackets.
Example: string cars[4]; declares an array of four strings.

Initializing an Array

Use an array literal to insert values into an array, by placing the values in a comma-separated list inside curly braces.
Example: string cars[4] = {"Volvo", "BMW", "Ford", "Mazda"]; initializes an array of four strings.
Example: int myNum[3] = {10, 20, 30}; initializes an array of three integers.

Accessing Array Elements

Access an array element by referring to the index number.
The first element of an array has an index of 0.
Example: cars[0] accesses the value of the first element in the cars array.

Array Overview

An array is a special type of variable that can contain one or more values of the same data type.
An array has a common name identifier or variable name and can hold many values at the same time, provided they have the same data type.

Learning Outcomes

Describe the nature and purpose of an array.
Use arrays in simple C++ programs.
Declare, instantiate, and initialize arrays.
Define methods that have an array as a parameter.

Declaring an Array

To declare an array, define the variable type, specify the name of the array, and enclose the number of elements in square brackets.
Example: string cars[4]; declares an array of four strings.

Initializing an Array

Use an array literal to insert values into an array, by placing the values in a comma-separated list inside curly braces.
Example: string cars[4] = {"Volvo", "BMW", "Ford", "Mazda"]; initializes an array of four strings.
Example: int myNum[3] = {10, 20, 30}; initializes an array of three integers.

Accessing Array Elements

Access an array element by referring to the index number.
The first element of an array has an index of 0.
Example: cars[0] accesses the value of the first element in the cars array.

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Description

Learn about arrays in C++ programming, a data structure that holds multiple values of the same data type. Understand the purpose and nature of arrays.