Podcast
Questions and Answers
What is necessary to initialize a const data member in a class?
What is necessary to initialize a const data member in a class?
What does a constant pointer to a variable mean?
What does a constant pointer to a variable mean?
Which of the following statements about constexpr is true?
Which of the following statements about constexpr is true?
What is the primary function of the const keyword in programming?
What is the primary function of the const keyword in programming?
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Which statement best describes const objects?
Which statement best describes const objects?
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Which of the following correctly defines a pointer to a constant variable?
Which of the following correctly defines a pointer to a constant variable?
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Which of the following can the const keyword be associated with?
Which of the following can the const keyword be associated with?
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What is one of the restrictions on constexpr functions?
What is one of the restrictions on constexpr functions?
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What happens if a constant variable is not initialized at the time of declaration?
What happens if a constant variable is not initialized at the time of declaration?
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What happens if a const variable is declared without initialization?
What happens if a const variable is declared without initialization?
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What is the effect of declaring a function as const?
What is the effect of declaring a function as const?
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What type of constructors can be part of a class that is used with constexpr?
What type of constructors can be part of a class that is used with constexpr?
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In the method declaration void myMethod(const MyObj& x), what does the const keyword signify?
In the method declaration void myMethod(const MyObj& x), what does the const keyword signify?
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Which declaration correctly defines a constant pointer to a constant variable?
Which declaration correctly defines a constant pointer to a constant variable?
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What is required when a const object is declared?
What is required when a const object is declared?
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What is the primary purpose of using constexpr in C++11?
What is the primary purpose of using constexpr in C++11?
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What is the implication of declaring a return type as constant in a method?
What is the implication of declaring a return type as constant in a method?
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Which of the following is NOT a valid use of the const keyword?
Which of the following is NOT a valid use of the const keyword?
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When attempting to change a const variable's value during execution, what will happen?
When attempting to change a const variable's value during execution, what will happen?
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Which statement about const pointers is correct?
Which statement about const pointers is correct?
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Study Notes
Programming II - Course 8
- The course is titled Programming II, Course 8 - Special Keywords
- The presenter is Bianca lacob
- The institution is Transilvania University of Brasov
- The year is 2024
Special Keywords
-
const
- Defines a constant value that cannot be changed during program execution.
- Once declared, the value of the variable remains fixed.
- Attempts to change a
constvariable will result in an error. - Can be associated with variables, methods, pointers, and class objects
- Variables must be initialized at declaration.
-
constexpr
- Introduced in C++11.
- Improves program performance by performing calculations at compile time.
- Can only call other
constexprfunctions. -
constexprfunctions cannot return void type -
constexprvariables must be initialized at declaration time. - Returns literal types (e.g., void, scalar types, references, arrays of void, scalar types, or references).
- Classes with certain constructors and trivial destructors can be used
-
inline
- Reduces function call overhead in C++.
- Functions are expanded in-line where they are called.
- Compiler requests, not guaranteed.
- Not suitable for large or recursive functions, loops, or switch statements, static variables.
- Increases efficiency for small functions
-
=default
- Explicitly declares the default implementation for a function (constructor, copy constructor, destructor, etc.)
- Improves efficiency compared to manually coded default implementations.
- Used when a parameterized constructor is defined, but a default constructor is needed.
- Applied to special member functions.
-
=delete
- Disables the use of a member function (such as constructor, copy constructor, destructor etc.)
- Ensures that the compiler does not generate a desired function.
- Applied to special member functions.
-
noexcept
- Performs a compile-time check to determine if an expression will throw an exception.
- Used to specify that a function does not throw an exception.
- Added to the end of the function declaration.
-
auto
- Simplifies variable declaration, eliminating explicit type specification.
- Compiler infers the type based on initialization expression.
- Type qualifiers (e.g.,
const) from the initialization are preserved. - Useful for templates and complex data types (like iterators).
- Variables using
automust be initialized at declaration time.
Additional Information
-
decltype
- Used to get a type based on an expression.
- Used along with
typeidto get information about variable types. - The output of
typeid(...).name()is compiler dependent.
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Description
Test your knowledge on special keywords like 'const' and 'constexpr' introduced in C++. This quiz examines your understanding of how these keywords enhance program performance and ensure value stability. Perfect for reinforcing concepts from Programming II, Course 8.
