C + +: How member functions of a class are defined

1. The first way to define a member function: Only the prototype of the member function is given in the class declaration, and the definition of the member function
Placed outside of the class.
Return value type class Name:: member function name (parameter table)
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function body
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classpoint{ Public:     voidSetPoint (int,int);//function prototype for setting the member function of a coordinate point setpoint     intGetx ();//function prototype of member function getx with X coordinate points     intGety ();//function prototype of member function gety with Y coordinate point Private:     intx, y; };voidPonit::setpoint (intAintb//define member functions outside the class SetPoint{x=A; Y=b;}intPoint::getx ()//define member functions outside the class Getx{     returnx;}intPoint:: Gety ()//define member functions outside the class Gety{     returny;}/*

2. The second way to define member functions is to define the member functions directly inside the class

classpoint{ Public:     voidSetPoint (intAintb)//The member function setpoint is defined directly inside the class{x=A; Y=b; }      intGetx ()//The member function GETX is defined directly inside the class     {           returnx; }      intGety ()//The member function gety is defined directly inside the class     {           returny; } Private:     intx, y; };

3, the third definition of member functions: The functions setpoint, getx and gety as inline functions, that is,
These functions are implicitly defined as inline member functions.

classpoint{ Public: InlinevoidSetPoint (int,int);//declaring member functions setpoint as inline functionsInlineintGetx ();//declaring member functions getx as inline functionsInlineintGety ();//declaring member functions getx as inline functions Private:     intx, y; };inlinevoidPoint::setpoint (intAintb//define function SetPoint as inline function outside the class{x=A; Y=b;} InlineintPoint::getx ()//define function Getx as inline function outside the class{     returnx;} InlineintPoint::gety ()//define function Gety as inline function outside the class{     returny;} 

C + +: How member functions of a class are defined