chapter 4- array

What is an array in C++?

• A single value that stores multiple variables

• A data structure used to store multiple values of different types

• A group of values stored in a single variable, all of the same type

• A group of functions working together

Answer explanation

An array stores multiple values of the same data type (e.g. int, float, char) under one variable name. Each value is accessed by its index.

Which of the following is the correct way to declare a one-dimensional array of 5 integers?

• int number[5];

• int number = [5];

• array int[5];

• int[5] number;

Answer explanation

The correct syntax to declare a one-dimensional array is:
data_type arrayName[size];
Here, int is the data type, number is the name, and [5] is the size.

What is the index of the first element in an array in C++?

• 1

• -1

• 0

• 10

Answer explanation

In C++, array indexing starts at 0. So, the first element is at index 0, second at index 1, and so on

How do you access the third element in an array named marks?

• marks(3);

• marks[2];

• marks[3];

• marks{3};

Answer explanation

Array index starts from 0, so the third element is at index 2.
Syntax: arrayName[index]

What is the output of this code?

int numbers[3] = {10, 20, 30};

cout << numbers[1];

• 10

• 20

• 30

• Error

Answer explanation

In the array {10, 20, 30}, the index of 10 is 0, 20 is 1, and 30 is 2.
So, numbers[1] outputs 20.