C++ Basics (1)

What is a variable in C++?

• A keyword that holds a constant value

• A memory location that stores a value and can change during program execution

• A function that performs a task

• A literal that cannot be modified

Which of the following is a valid way to declare a constant in C++?

• int const PI = 3.14;

• constant int PI = 3.14;

• const int PI = 3.14;

• double PI = 3.14;

Which of the following is an integer data type in C++?

• float

• char

• int

• bool

What is the output of the following code? bool x = true; cout in a C++ program?

• To include standard input/output functions

• To define constants

• To declare variables

• To create a new library

What is the value of x after the following code? int x = 5; x += 3;

• 5

• 8

• 3

• 10

What is the correct way to read input from the console in C++?

• cin >> variable;

• get(input);

• input(variable);

• scanf("%d", &variable);

Which of the following symbols is used for comments that span multiple lines in C++?

• //

• /* */

• #

• {}

What is the default value of an uninitialized variable in C++?

• 0

• 1

• Undefined (it may contain garbage values)

• null

Which of the following correctly declares an array in C++?

• int myArray[5];

• array myArray(5);

• int[5] myArray;

• array int myArray[5];

What will happen if you try to modify a constant variable in C++?

• The program will compile and run normally

• It will throw a runtime error

• It will throw a compile-time error

• The program will ignore the modification