Lesson 6 C++ Arrays Quiz

What is an array in C++?

• A data structure to store a collection of elements of different types.

• A data structure to store a fixed-size sequential collection of elements of the same type.

• A control flow statement used for iteration.

• A method to access elements in a sequence.

In a C++ for loop, what part is executed before each iteration?

• The loop condition

• The code block

• The increment/decrement expression

• The initialization expression

How do you access elements of an array in C++?

• By referring to the element's name.

• By using a dot operator followed by the index number.

• By referring to the index number inside square brackets.

• By using the "get" function with the element's position.

What does the "Initialization" part of a for loop in C++ do?

• It specifies the loop condition.

• It executes code only once at the beginning of the loop.

• It executes after each iteration of the loop.

• It initializes a loop counter variable.

How is an array declared in C++?

• Specify the name of the array followed by parentheses.

• Define the variable type, specify the name of the array followed by square brackets, and specify the number of elements it should store.

• Define the variable type, specify the name of the array followed by curly braces.

• Use the "new" keyword followed by the number of elements.

Which of the following is NOT a valid way to initialize an array in C++?

• int numbers[] = {1, 2, 3, 4, 5};

• int numbers[5] = {1, 2, 3};

• int numbers[5] = {0};

• int numbers[5] = {};

How do you access the third element (index 2) of an array named "cars" that stores strings?

• cars(2)

• cars[2]

• cars.get(2)

• cars.index(2)

What is the output of the following code snippet?

C++

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

for (int i = 0; i < 4; i++) {

    cout << numbers[i] << " ";

}

• 10 20 30

• 10 20 30 0 (undefined behavior)

• Compilation error

• An infinite loop

Which of the following is NOT a valid way to initialize an array in C++?

• During declaration: int numbers[5] = {1, 2, 3};

• After declaration: numbers[0] = 10;

• Using a loop: for (int i = 0; i < 5; i++) numbers[i] = i;

• Using a function (not possible in C++

Which of the following correctly declares an array named "numbers" that can hold 5 integers?

• int numbers = {1, 2, 3, 4, 5};

• int numbers[5];

• int(5) numbers;

• None of the above