25.类，对象，成员实例

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第一种写法：
8 H+ v, V) f) i#include <iostream>
& n3 i  p3 a# [5 d9 Fusing namespace std;
class Human
{
public:
void GetHeight(){cout<<Height;}
/ ?0 }5 S0 D. R( C7 F; H6 c void GetWeight(){cout<<Weight;}
void SetHeight(int x){Height=x;}
: B3 o9 `! U8 s, R* v void SetWeight(int y){Weight=y;}
& m  k( `/ N8 V2 ^' qprivate:
/ W3 n* G/ y5 q7 T' e& ?6 d int Height;
int Weight;
5 E3 u+ g# C# N* B. K};
7 |9 ]% k) x& ^- t8 F
6 {/ ~$ g4 D5 r0 {void main(void)
% y* k# Z! b( X- c1 [1 n{
   Human Lee;
; S% S* C6 A, ~& g; x   Lee.SetHeight(172);
   cout<<"Lee的身高是：";
' N9 B+ w" ~, g1 u   Lee.GetHeight();
   cout<<endl;
   Lee.SetWeight(120);
   cout<<"Lee的体重是：";
! I  G8 N4 V% V' C1 |. E   Lee.GetWeight();
   cout<<endl;
}
第二种写法：
+ Z2 X: X+ U$ m, p% E% R* n5 ~#include <iostream>
using namespace std;
class Human
& c! i8 Y" i' i0 ]- m, \{
7 g; a" ?5 ~( Y3 spublic:
& u5 S+ I6 |) r% q& O0 r* J void GetHeight();
    void GetWeight();
void SetHeight(int x);
1 u5 V9 v& R4 Y( ?; t0 l void SetWeight(int y);
private:
int Height;
' K) k5 I# T% C+ i int Weight;
, C; Q0 g& G# L, i: g# k; Q};
2 L9 l. G' \0 L( a3 P7 e0 Tvoid Human::SetHeight(int x)
{
7 G/ ?$ E2 E, I5 e  `  P Height=x;
) h' E( \7 A9 Q! K" U1 `9 I}
1 M/ v# }; H; Z" B  w1 |- qvoid Human::GetHeight()
' D1 {9 e- B" s{
  s' {& ]0 y  S/ ]: S3 E5 u  t9 O3 l cout<<Height;
}
. x( Y5 e# N2 zvoid Human::SetWeight(int y)
: V3 b. G$ h4 ^1 ]5 c" e0 K! s4 W{
9 b0 D& |# y4 L- ~$ V+ ~) c1 G Weight=y;
}
) I1 @' a" E$ t4 g9 Fvoid Human::GetWeight()
{
cout<<Weight;
4 F  Z% E0 P/ u}
9 B/ V# k0 ~- u' S9 n4 Wvoid main(void)
{
4 d1 U/ u) N# u' ?( N   Human Lee;
. x! L4 e5 r4 n, [   Lee.SetHeight(172);
   cout<<"Lee的身高是：";
9 _3 `2 l+ Z9 y% N1 d  j   Lee.GetHeight();
   cout<<endl;
( W% ^" Y, ^( Z0 k# t  w$ q0 n   Lee.SetWeight(120);
   cout<<"Lee的体重是：";
1 V7 m5 Z$ R+ k3 B' k2 \   Lee.GetWeight();
   cout<<endl;
}
推荐第二种写法
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! K" h( Y, ]2 Q& e/ `# A; S