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Question 1

What are tokens in C++?

Answer 1

Tokens are the smallest individual units in a program.

Question 2

What are the types of tokens available in C++?

Answer 2

• Keywords
• Identifiers
• Constants
• Strings
• Operators

Question 3

Define keywords in C++.

Answer 3

Keywords are reserved words with predefined meanings that cannot be used for other purposes.

Question 4

What does the ‘auto’ keyword do in C++?

Answer 4

Automatically identifies the data type of a variable based on its initializer.

Question 5

What is the purpose of the ‘default’ keyword in C++?

Answer 5

Specifies default behavior related to constructors, function arguments, or switch cases.

Question 6

What does the ‘break’ keyword accomplish in C++?

Answer 6

Exits a loop or switch case statement.

Question 7

What is the function of the ‘case’ keyword in C++?

Answer 7

Marks a particular case in a switch statement.

Question 8

What does the ‘char’ keyword represent in C++?

Answer 8

Represents a character type (1 byte).

Question 9

What does the ‘const’ keyword indicate in C++?

Answer 9

Defines a variable that cannot be changed after initialization.

Question 10

What is the role of the ‘continue’ keyword in C++?

Answer 10

Skips the current iteration of a loop and proceeds to the next one.

Question 11

What does the ‘double’ keyword represent in C++?

Answer 11

Represents a double-precision floating-point number.

Question 12

What is the purpose of the ‘else’ keyword in C++?

Answer 12

Specifies an alternative to the if statement.

Question 13

What does the ‘enum’ keyword do in C++?

Answer 13

Defines an enumerated data type.

Question 14

What does the ‘float’ keyword represent in C++?

Answer 14

Represents a single-precision floating-point number.

Question 15

What is the function of the ‘for’ keyword in C++?

Answer 15

Creates a loop that iterates over a defined range.

Question 16

What does the ‘if’ keyword create in C++?

Answer 16

Creates a conditional statement that evaluates whether a condition is true or false.

Question 17

What does the ‘int’ keyword represent in C++?

Answer 17

Represents an integer type, typically 2 or 4 bytes.

Question 18

What does the ‘long’ keyword represent in C++?

Answer 18

Represents a long integer type, typically 4 or 8 bytes.

Question 19

What is the role of the ‘namespace’ keyword in C++?

Answer 19

Creates a namespace that can contain variables and functions.

Question 20

What does the ‘new’ keyword do in C++?

Answer 20

Dynamically allocates memory during program execution.

Question 21

What is the purpose of the ‘return’ keyword in C++?

Answer 21

Exits a function and optionally returns a value.

Question 22

What does the ‘short’ keyword represent in C++?

Answer 22

Represents a short integer type, typically 2 bytes.

Question 23

What does the ‘signed’ keyword specify in C++?

Answer 23

Indicates that a variable can hold negative and positive values.

Question 24

What does the ‘static’ keyword indicate in C++?

Answer 24

Specifies that a variable or function belongs to the class and is not an instance.

Question 25

What does the 'struct' keyword define in C++?

Answer 25

Defines a composite data type, similar to a class.

Question 26

What is the function of the 'switch' keyword in C++?

Answer 26

Creates a switch statement that evaluates an expression against a range of possible values.

Question 27

What does the 'typedef' keyword do in C++?

Answer 27

Creates aliases for data types.

Question 28

What does the 'unsigned' keyword specify in C++?

Answer 28

Indicates that a variable can hold only positive values.

Question 29

What does the 'sizeof' keyword return in C++?

Answer 29

Returns the size in bytes of a data type or variable.

Question 30

What are identifiers in C++?

Answer 30

Unique names given to variables, classes, functions, or other entities by the programmer.

Question 31

What are the rules for naming an identifier in C++?

Answer 31

* Can consist of letters, digits, and underscores * Must begin with a letter or underscore * Cannot use reserved keywords * Must be unique in its namespace * Case-sensitive

Question 32

List the built-in types in C++.

Answer 32

* int * char * float * double * long double * void

Question 33

What are the user-defined types in C++?

Answer 33

* struct * class * union * enum

Question 34

What are derived data types in C++?

Answer 34

* Arrays * Pointers * References * Functions

Question 35

What is the purpose of the 'void' type in C++?

Answer 35

* Specifies the return type of a function when it is not returning any value * Indicates an empty argument list to a function.

Question 36

What does the 'signed' modifier indicate?

Answer 36

The data type can hold both positive and negative values.

Question 37

What does the 'unsigned' modifier indicate?

Answer 37

The data type can only hold non-negative values.

Question 38

What does the 'short' modifier do?

Answer 38

Reduces the size of the data type (usually 2 bytes).

Question 39

What does the 'long' modifier do?

Answer 39

Increases the size of the data type (varies by implementation).

Question 40

What does the signed modifier indicate in C++ data types?

Answer 40

The data type can hold both positive and negative values.

Question 41

What does the unsigned modifier indicate in C++ data types?

Answer 41

The data type can only hold non-negative values.

Question 42

What is the effect of the short modifier on data types?

Answer 42

Reduces the size of the data type (usually 2 bytes).

Question 43

What does the long modifier do to data types in C++?

Answer 43

Increases the size of the data type (varies by implementation).

Question 44

How many bytes does a char data type use in C++?

Answer 44

1 byte.

Question 45

What is the range of an unsigned char in C++?

Answer 45

0 to 255.

Question 46

What is the range of a signed char in C++?

Answer 46

-128 to 127.

Question 47

How many bytes does an int data type use in C++?

Answer 47

2 bytes.

Question 48

What is the range of an unsigned int in C++?

Answer 48

0 to 65535.

Question 49

What is the range of a signed int in C++?

Answer 49

-32768 to 32767.

Question 50

How many bytes does a long int data type use in C++?

Answer 50

4 bytes.

Question 51

What is the range of an unsigned long int in C++?

Answer 51

0 to 4294967295.

Question 52

How many bytes does a float data type use in C++?

Answer 52

4 bytes.

Question 53

What is the range of a double data type in C++?

Answer 53

1.7E-308 to 1.7E+308.

Question 54

How many bytes does a long double data type use in C++?

Answer 54

10 bytes.

Question 55

What is a symbolic constant in C++?

Answer 55

A way to give a meaningful name to a constant value.

Question 56

What keyword is used to define a constant variable in C++?

Answer 56

const.

Question 57

What is an advantage of using the const keyword?

Answer 57

Directly associates the constant with a variable type.

Question 58

What does the constexpr keyword indicate?

Answer 58

The value of the constant is evaluated at compile time.

Question 59

What is an advantage of using constexpr over const?

Answer 59

Ensures that the value is constant and available at compile time.

Question 60

Fill in the blank: Symbolic constants are typically used to represent values that do not change throughout the execution of a program, such as _______.

Answer 60

[mathematical constants, configuration values, fixed parameters]