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Questions and Answers
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.
False
A constructor is generally used to initialize the data members of a new _____ .
object
What is the syntax for defining a constructor in C++?
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Which statement about C++ constructors is true?
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What would happen if no constructor is defined for a class in C++?
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Which of the following correctly initializes data members in a constructor?
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What is the main purpose of a constructor in C++?
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In the provided constructor example, what values are assigned to hr and min?
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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.
