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Questions and Answers
What is a constructor in C++?
What is a constructor in C++?
A constructor is a special method that is automatically called when an object of a class is created, used to initialize the data members of the new object.
The constructor has a different name than the class it initializes.
The constructor has a different name than the class it initializes.
False (B)
A constructor is generally used to initialize the data members of a new _____ .
A constructor is generally used to initialize the data members of a new _____ .
object
What is the syntax for defining a constructor in C++?
What is the syntax for defining a constructor in C++?
Which statement about C++ constructors is true?
Which statement about C++ constructors is true?
What would happen if no constructor is defined for a class in C++?
What would happen if no constructor is defined for a class in C++?
Which of the following correctly initializes data members in a constructor?
Which of the following correctly initializes data members in a constructor?
What is the main purpose of a constructor in C++?
What is the main purpose of a constructor in C++?
In the provided constructor example, what values are assigned to hr and min?
In the provided constructor example, what values are assigned to hr and min?
Study Notes
C++ Constructor
- A constructor is a special method in C++ automatically executed upon object creation.
- Its primary function is to initialize data members of a new object.
- The constructor shares the same name as the class or structure.
- Syntax for defining a constructor:
class class_name{// data members;// member functions;public:class_name() //constructor{//body of constructor}//member functions;};
Example of a Constructor
- Example class definition:
class Time{int hr;int min;public:Time() // Constructor{hr=0;min=0;}};
- In this example, the constructor initializes
hrandminto zero.
Creating a Constructor
- To create a constructor, use the class name followed by parentheses.
- Example:
class MyClass{public:MyClass(){cout << ...}};
C++ Constructor
- A constructor is a special method in C++ automatically executed upon object creation.
- Its primary function is to initialize data members of a new object.
- The constructor shares the same name as the class or structure.
- Syntax for defining a constructor:
class class_name{// data members;// member functions;public:class_name() //constructor{//body of constructor}//member functions;};
Example of a Constructor
- Example class definition:
class Time{int hr;int min;public:Time() // Constructor{hr=0;min=0;}};
- In this example, the constructor initializes
hrandminto zero.
Creating a Constructor
- To create a constructor, use the class name followed by parentheses.
- Example:
class MyClass{public:MyClass(){cout << ...}};
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Description
This quiz focuses on the concepts of constructors and destructors in C++. It covers the importance of constructors in initializing data members when an object is created. Test your knowledge on the syntax and functionality of these essential components of C++ programming.
