24 Lecture - MODIFIED DEFAULT CONSTRUCTOR

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24 Lecture

CS304

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MODIFIED DEFAULT CONSTRUCTOR

A default constructor is a constructor that takes no arguments and is provided by the compiler if no other constructors are defined for a class. A modified default constructor is a default constructor that has been customized to initialize the c


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  1. What is a modified default constructor? a) A constructor that takes no arguments b) A constructor that is defined by the programmer c) A default constructor that has been customized to initialize the class data members to specific values d) None of the above Answer: c When is a default constructor provided by the compiler? a) When no other constructors are defined for the class b) When a constructor is defined by the programmer c) When a class has no data members d) None of the above Answer: a How can a modified default constructor be useful? a) It allows the programmer to provide a default state for the class when it is created b) It allows the user to provide initialization values for the class data members c) It allows the programmer to create multiple instances of the class with different initial values d) None of the above Answer: a Can a modified default constructor take arguments? a) Yes b) No Answer: b What happens if a modified default constructor is not defined for a class? a) The compiler will provide a default constructor that initializes the class data members to default values b) The program will not compile c) The class data members will be left uninitialized d) None of the above Answer: a What is the difference between a default constructor and a modified default constructor? a) A default constructor initializes the class data members to default values, while a modified default constructor initializes them to specific values b) There is no difference, they are the same thing c) A default constructor is provided by the compiler, while a modified default constructor is defined by the programmer d) None of the above Answer: a Can a modified default constructor be overloaded? a) Yes b) No Answer: a What is the syntax for defining a modified default constructor? a) ClassName(); b) ClassName::ClassName(); c) ClassName::ModifiedDefaultConstructor(); d) None of the above Answer: b How many constructors can a class have? a) Only one b) As many as the programmer wants to define c) Only one of each type (default, copy, etc.) d) None of the above Answer: b What is the purpose of a constructor? a) To initialize the class data members b) To allocate memory for the class object c) To define the behavior of the class object d) All of the above Answer: a



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  1. What is a modified default constructor? Answer: A modified default constructor is a default constructor that has been customized to initialize the class data members to specific values. How is a modified default constructor defined? Answer: A modified default constructor is defined using the syntax ClassName::ClassName() { // code to initialize data members } Can a modified default constructor take arguments? Answer: No, a modified default constructor takes no arguments. What is the purpose of a default constructor? Answer: The purpose of a default constructor is to create an object of the class with default values for its data members. What happens if a modified default constructor is not defined for a class? Answer: If a modified default constructor is not defined for a class, the compiler will provide a default constructor that initializes the class data members to default values. Can a modified default constructor be overloaded? Answer: Yes, a modified default constructor can be overloaded to take different arguments or initialize data members in different ways. What is the difference between a default constructor and a modified default constructor? Answer: A default constructor initializes the class data members to default values, while a modified default constructor initializes them to specific values. Can a class have multiple constructors? Answer: Yes, a class can have multiple constructors, including default constructors, copy constructors, and others. What is the syntax for calling a modified default constructor? Answer: To call a modified default constructor, simply create an object of the class using the default constructor syntax: ClassName obj; When is a default constructor provided by the compiler? Answer: A default constructor is provided by the compiler when no other constructors are defined for the class.

A default constructor is a constructor that is provided by the compiler if no other constructors are defined for a class. It initializes the class data members to default values. However, sometimes the programmer may want to initialize the data members to specific values when an object of the class is created. In such cases, a modified default constructor can be defined. A modified default constructor is a default constructor that has been customized to initialize the class data members to specific values. It is defined using the syntax ClassName::ClassName() { // code to initialize data members }. This allows the programmer to provide a default state for the class when it is created without requiring the user to provide initialization values. A modified default constructor can be useful in situations where the programmer wants to provide a default state for the class, but the default values are not appropriate. For example, if a class represents a rectangle, the default values for the length and width data members might be zero. However, it might be more useful to initialize them to one. In this case, a modified default constructor could be defined to initialize the length and width data members to one. It is important to note that a modified default constructor takes no arguments. It is also possible to overload a modified default constructor to take different arguments or initialize data members in different ways. If a modified default constructor is not defined for a class, the compiler will provide a default constructor that initializes the class data members to default values. However, it is a good practice to define a modified default constructor if the default values are not appropriate for the class. In conclusion, a modified default constructor is a powerful tool for customizing the default state of a class. It allows the programmer to provide a default state for the class without requiring the user to provide initialization values. This can make the class easier to use and more robust.

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