25.类，对象，成员实例

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第一种写法：
1 s4 ?6 g0 q4 d9 e* C#include <iostream>
: a3 R6 `2 ~7 C$ y- ]using namespace std;
3 B4 W! o2 K' \class Human
{
( h. X8 |6 R1 ]& i- epublic:
: Y$ z$ I( l$ F- X- v void GetHeight(){cout<<Height;}
* S3 @8 `# I( C1 D* g1 g# G void GetWeight(){cout<<Weight;}
' V& M, w9 ^5 W5 \9 C! `! E void SetHeight(int x){Height=x;}
void SetWeight(int y){Weight=y;}
& l2 O4 \4 L; |. [4 Zprivate:
7 N) o1 A5 @, b* X8 ?3 g int Height;
) G  S" _& G0 | int Weight;
. z3 o# A6 W7 m/ S};

void main(void)
; p, g$ C! c4 n7 A+ v9 j1 h1 y. z( m{
   Human Lee;
  [" r) C# L& B( g   Lee.SetHeight(172);
6 @: i. l* i/ o, i; V   cout<<"Lee的身高是：";
   Lee.GetHeight();
   cout<<endl;
2 H' k3 P8 s' p, W   Lee.SetWeight(120);
   cout<<"Lee的体重是：";
! t' ]- m( q! O# ^) j. ?; e8 ~   Lee.GetWeight();
& }+ C* J8 K3 T5 ?: n2 m   cout<<endl;
}
+ \2 N! V# A6 f% L# a% l4 T! h, B第二种写法：
- G+ ~* @! z+ U8 |+ c#include <iostream>
using namespace std;
( ?  d9 C+ x+ w% z$ V" M& D* gclass Human
{
public:
* V6 ^0 Z$ V0 \ void GetHeight();
! O: ?; G$ o" V0 W# n( P2 t    void GetWeight();
void SetHeight(int x);
void SetWeight(int y);
$ [5 h; O2 ?% }2 h9 w% lprivate:
int Height;
int Weight;
$ z; d: T7 a$ t/ |3 W};
void Human::SetHeight(int x)
{
Height=x;
}
* f0 z) z' Y. a, z9 F: i& E0 mvoid Human::GetHeight()
{
  c/ A8 X# ^. V0 E9 T& V0 ^ cout<<Height;
}
5 L7 J! E& y7 j1 g, r( qvoid Human::SetWeight(int y)
{
Weight=y;
1 D- |0 M# ]) k7 R9 _9 ^}
void Human::GetWeight()
{
% }4 S' p9 o. y1 O3 C cout<<Weight;
}
7 b# e- x% s  J& W. N: cvoid main(void)
{
   Human Lee;
   Lee.SetHeight(172);
   cout<<"Lee的身高是：";
   Lee.GetHeight();
   cout<<endl;
   Lee.SetWeight(120);
" q: ]. G& z' T   cout<<"Lee的体重是：";
   Lee.GetWeight();
   cout<<endl;
}
' y4 S' C: R) F3 O/ n! V推荐第二种写法
) k7 W4 [. {* y  V3 V
% s6 l$ |2 E5 n5 X' }* {