Programming II - Course 8 Quiz

A constant data member must be initialized within the member initializer list of the constructor. This ensures the value is set right at object creation.

A const pointer can point to a constant value, which is a variable declared as const, or it can be a constant pointer itself, meaning it cannot change the address it points to. In more complex scenarios, both the pointer and the value it points to can be constant.

A class declared as const can still be constructed and destructed. However, its member functions (other than the constructor and destructor) cannot modify the data members of the class.

A concept introduced to increase program performance by allowing calculations to be done at compile time. It can improve the execution speed of your code.

A function declared with constexpr must return a value of a literal type, like void, scalar types (like int, float), references, arrays of literal types, or classes with a trivial destructor and at least one constexpr constructor that is not a move or copy constructor. These restrictions ensure the return value is calculable at compile time.

A constexpr function can only call other constexpr functions. This ensures the entire computation is performed at compile time.

A constexpr function cannot return void. Void functions have no return value, incompatible with the compile-time evaluation of constexpr.

Any variable declared with constexpr must be initialized at the time of declaration. This ensures the constant value is available during compilation and does not require any runtime initialization.

A constexpr function cannot modify external variables during compilation. It acts like a pure function, only calculating the return value based on the input parameters.

A constexpr function can be called like a regular function, but if its arguments meet the requirements for compile-time evaluation, the calculation will be performed at compile time rather than during runtime.

The const keyword in C++ is used to declare variables, methods, pointers, and objects as constant, meaning their values cannot be modified after initialization. It ensures data integrity and prevents accidental changes.

Yes. When a variable is declared with const, it must be initialized at the time of its declaration. You cannot assign a value later. For example, const int x = 10; is valid, but const int x; x = 10; is invalid.

When a method is declared as const, it guarantees that the method will not modify the object on which it is called. This is useful to ensure that objects are not accidentally modified by methods. You can call const methods on both const and non-const objects. For example, void myMethod() const;.

A const parameter indicates that a method cannot modify the value of the parameter passed to it. This is helpful for ensuring that data passed as an argument remains unchanged within a method. For example, void myMethod(const MyObj &x);.

A const return type indicates that the function will return a reference or pointer to a constant object. This ensures that the returned value cannot be modified by the caller.

Constants are useful for defining values that should not change during program execution, enhancing code readability and maintainability. They prevent accidental modifications and improve the overall robustness of the program.

The const keyword provides a way to enforce immutability, preventing accidental changes to variables, method parameters, return values, and object members. It contributes to code robustness and clarity.

You can use the const keyword when declaring variables, methods, method parameters, and return types. While you can't modify the reference itself, you can access the members of a const object if they are not themselves const.

The const keyword helps ensure data integrity by preventing unintentional modifications. It clarifies intent and makes code more readable. Additionally, compilers can optimize code for efficiency when they know the values are constants.

The const keyword can be used to optimize code, as compilers can take advantage of the knowledge that a value is constant. This can lead to better performance and faster execution.