CurriculumConstructors
Constructors
A <strong>Constructor</strong> is a special member function that runs automatically when an object is created. Its job is to initialize member variables to valid values. Same name as the class, no return type.
01Default Constructor
If you define no constructor, C++ provides an empty default. Write your own to set initial values.
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02Parameterized Constructor
Pass arguments to initialize with specific values right at creation time. Much cleaner than setting each member after creation.
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03Initializer List (The Right Way)
The
: member(value) syntax initializes members BEFORE the constructor body runs. For const members it is the ONLY option.main.cpp
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04Constructor Overloading
Multiple constructors with different parameter lists. C++ picks the right one based on how you create the object.
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05Delegating Constructors
One constructor calls another of the same class to avoid duplicating initialization code.
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06'explicit' Keyword
Prevents silent implicit conversions. Without it C++ silently converts a number into your class object, causing confusing bugs.
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AI Tutor
Without a constructor, object data is uninitialized garbage. A constructor guarantees the object starts in a valid, predictable state.