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==Constructor overloading==
[[Constructor (object-oriented programming)|Constructors]], used to create instances of an object, may also be overloaded in some [[Object-oriented programming|object-oriented]] [[programming language]]s. Because in many languages the constructor's name is predetermined by the name of the class, it would seem that there can be only one constructor. Whenever multiple constructors are needed, they are to be implemented as overloaded functions. In [[C++]], [[default constructor]]s take no parameters, instantiating the object [[Instance variable|members]] with their appropriate default values, "which is normally zero for numeral fields and empty string for string fields".<ref>{{cite book |last1=Chan |first1=Jamie |title=Learn C# in One Day and Learn It Well |date=2017 |isbn=978-1518800276 |page=82 |edition=Revised}}</ref> For example, a default constructor for a restaurant bill object written in C++ might set the tip to 15%:
<syntaxhighlight lang=Cpp>
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