25.类，对象，成员实例

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第一种写法：
* z; b& M3 ^2 v* `& \$ O/ G# F) x#include <iostream>
using namespace std;
class Human
{
public:
void GetHeight(){cout<<Height;}
void GetWeight(){cout<<Weight;}
% k/ n; @% j" }2 W  e, u void SetHeight(int x){Height=x;}
void SetWeight(int y){Weight=y;}
% e) v8 X% A9 n4 q9 dprivate:
& T( W# w) k  \+ S" d int Height;
- d, r2 v3 J! D int Weight;
1 s$ [) Q7 P: w3 }};
$ _0 X8 R, ^# ^0 r
8 T: B  s/ A/ H6 T0 i# S. Q# ovoid main(void)
7 q2 b: t' V8 d4 {; b{
   Human Lee;
, V- g* n+ J( @0 L% r   Lee.SetHeight(172);
   cout<<"Lee的身高是：";
( J3 q1 Q  S5 X8 b   Lee.GetHeight();
   cout<<endl;
   Lee.SetWeight(120);
   cout<<"Lee的体重是：";
   Lee.GetWeight();
# i, e8 }# p( [1 b   cout<<endl;
}
第二种写法：
; `2 N: X, @, T" Y" V#include <iostream>
using namespace std;
class Human
{
* }% R% Y4 A8 G$ |: Xpublic:
* o' O0 j' D- |4 k4 O1 R0 r5 k void GetHeight();
) ?- O1 V  D% X5 O) p6 B    void GetWeight();
void SetHeight(int x);
) [7 a/ g% P0 @2 ~! s void SetWeight(int y);
private:
int Height;
7 U3 f% F5 s7 P4 W5 m% W int Weight;
};
void Human::SetHeight(int x)
7 C3 r( Q* }! P& y0 d* X. F1 h/ o{
Height=x;
0 y+ Q  p$ P3 e) Q, e}
* s7 ^9 M( D" e0 U8 V) \void Human::GetHeight()
{
cout<<Height;
}
# d* e; \" v5 J; b  ^; c+ Cvoid Human::SetWeight(int y)
{
Weight=y;
8 T4 o; E9 R3 H# o0 Q% ?}
6 a5 q8 q0 T. V3 B* c" J/ rvoid Human::GetWeight()
{
cout<<Weight;
& T' Z" z% k$ E+ S}
9 N. T3 C( H. Lvoid main(void)
0 s6 N1 a* j- T  K+ U4 h) j9 E' }{
0 Q7 G- v) q5 d. P6 Z5 D2 h   Human Lee;
   Lee.SetHeight(172);
0 U. \8 @8 ^- G- V3 Z8 }: t   cout<<"Lee的身高是：";
( f! s4 `+ @* Q8 [   Lee.GetHeight();
; M( n! C/ b0 ]% M/ A- d: `7 d   cout<<endl;
2 b! m: u) o" T# |, X   Lee.SetWeight(120);
( X- ^6 J6 A- F( D0 D+ U/ `   cout<<"Lee的体重是：";
   Lee.GetWeight();
% O) F; a! H2 }" x6 ?  w3 h* D   cout<<endl;
}
% L+ K1 x! C- L推荐第二种写法