25.类，对象，成员实例

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第一种写法：
#include <iostream>
+ b5 e: d4 a8 m1 U4 qusing namespace std;
class Human
{
public:
void GetHeight(){cout<<Height;}
void GetWeight(){cout<<Weight;}
void SetHeight(int x){Height=x;}
, g2 q" j! L. X& b+ [" p! | void SetWeight(int y){Weight=y;}
2 ~+ t1 O; t) ?private:
# r- C( x' W2 L+ }% K" [0 x0 ]+ P: o4 x) b, W int Height;
int Weight;
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void main(void)
{
   Human Lee;
   Lee.SetHeight(172);
' C; j. s1 F7 I, q+ J) w8 O7 X   cout<<"Lee的身高是：";
   Lee.GetHeight();
   cout<<endl;
0 H8 r: ?+ Z8 T3 c' |   Lee.SetWeight(120);
   cout<<"Lee的体重是：";
2 G' p8 g# C1 [3 O, C* g* r' n% {   Lee.GetWeight();
) F/ \/ W$ e' I" L4 y& y   cout<<endl;
}
& m, N4 ?0 [( O# C. q+ X第二种写法：
  p$ W1 N' F- r, v8 c& z#include <iostream>
using namespace std;
: I6 ~- C/ y7 |; L% X4 z: F6 qclass Human
{
public:
void GetHeight();
    void GetWeight();
void SetHeight(int x);
void SetWeight(int y);
  @; l2 Y% o: L) O9 p) Xprivate:
! p: j# Y1 W" t3 g/ Z2 C int Height;
int Weight;
% z+ z+ ^3 b; V2 l4 }};
void Human::SetHeight(int x)
. N/ s  E2 z+ U8 Q+ G1 K{
/ D/ }1 [* T' V' n4 W# `0 Y7 V Height=x;
2 G  \+ F# n/ B- i. ]9 y}
void Human::GetHeight()
$ i/ L/ \5 K& ~+ T" `. @3 J: Y{
$ n: p% r/ T/ I$ k" O8 H cout<<Height;
8 o- ^0 ?  s, _}
& ?6 R- Z2 a, h9 Jvoid Human::SetWeight(int y)
# y, a2 c; t/ Z' ]5 r# b: I{
Weight=y;
" x/ a, c& A  K6 _}
8 K2 b9 V* y  Q2 Avoid Human::GetWeight()
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3 u* c: Y. v7 x8 e) u) @4 {% h7 B1 k cout<<Weight;
, K8 ]! m2 w# D0 n( }}
1 n9 c2 J$ z, F- vvoid main(void)
{
   Human Lee;
$ x# V( l$ b/ l+ }2 u( p   Lee.SetHeight(172);
+ n+ C2 y9 t9 o5 m& ^   cout<<"Lee的身高是：";
   Lee.GetHeight();
9 F% [) D$ K; A% q3 G; v1 `  b   cout<<endl;
   Lee.SetWeight(120);
/ u% [( Y' O( J5 R   cout<<"Lee的体重是：";
, ]$ y/ z$ F- e' ]7 D7 \   Lee.GetWeight();
   cout<<endl;
. ~+ {8 _/ }$ o( A}
! e1 d- y5 O2 `- S& k* N2 [) M* k推荐第二种写法
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