This document discusses constructor overloading in C++. It explains that constructor overloading allows a class to have multiple constructors as long as their signatures are different. This allows both initialized and uninitialized objects to be created. It provides examples of initialized objects, which call the constructor and initialize member variables, versus uninitialized objects, which do not initialize member variables. The document also discusses how to explicitly and implicitly call constructors when initializing objects.

1. Constructor
Overloading
Yogendra Pal

2. At the end of this tutorial you will be able to
• Overload a constructor.
• Differentiate between initialized and uninitialized object.
• Identify overloaded functions from a given c++ program.
• Identify which function will execute on a call to overloaded function.
• Call a constructor explicitly and implicitly.
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3. Constructor Overloading
• Creating more than one constructors for a c++ class.
• Signature of each constructor should be different.
• Allow to create both initialized and uninitialized objects.
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4. Create an initialized object
Uninitialized Object
• Time t;
• Time t = Time();
• Member variables are not
initialized.
Initialized Object
• Time t(04,02,1985);
• Time t = Time(04, 02, 1985);
• Member variables are
initialized.
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5. How to use Constructors?
• Two ways to initialize an object by using a constructor:
• An Explicit call to constructor: Time t1 = Time(12, 24, 10);
• An Implicit call to constructor: Time t1(12, 24, 10);
• Constructor is called whenever you create an object of a class.
• The constructor creates object.
• There is no object until the constructor finishes it’s work.
• You can’t call a constructor with an object.
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6. Ask Questions
to learn better
Yogendra Pal
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