25.类，对象，成员实例

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第一种写法：
# ~% w; O7 _5 C) X" d& u#include <iostream>
using namespace std;
class Human
{
public:
) y4 C/ t! d4 f0 g6 a void GetHeight(){cout<<Height;}
void GetWeight(){cout<<Weight;}
* U+ r& _' C% \ void SetHeight(int x){Height=x;}
' Q: ]9 b* X* |/ B, N6 b+ a void SetWeight(int y){Weight=y;}
private:
* o3 j% L  j& b7 y9 G int Height;
int Weight;
};

void main(void)
" r! {; y+ b  g. ?{
) S9 K4 T2 g% w  @2 A5 r   Human Lee;
. H6 g* [8 ~/ `  @, A# s, h   Lee.SetHeight(172);
   cout<<"Lee的身高是：";
) T! ?8 {7 T. n0 T3 Z8 R   Lee.GetHeight();
   cout<<endl;
   Lee.SetWeight(120);
  b' h8 r. f$ A& e   cout<<"Lee的体重是：";
' \2 V+ L3 c! V5 a3 c" }' z$ i$ K# `   Lee.GetWeight();
   cout<<endl;
2 ^3 S: o) E4 A* G}
+ A, I. J# a$ H7 N) n/ r9 u! Z$ @第二种写法：
; n1 q1 N* W& |& h; O$ z7 Q! J2 x#include <iostream>
2 n: }4 i; {: D3 A4 f' }using namespace std;
class Human
{
; e4 L4 D! Q2 Z3 kpublic:
void GetHeight();
+ z( A6 @$ c: z9 \    void GetWeight();
8 A2 w- m/ l/ W) j3 [ void SetHeight(int x);
) C' H! I7 J  Z, ~ void SetWeight(int y);
private:
int Height;
- x( _; |* O8 I7 w3 H8 b int Weight;
4 Y; i  u" [: }' ~};
4 p) ]3 g6 r7 O, @/ }void Human::SetHeight(int x)
& l( `2 y8 L& K- H# X: V5 r{
+ Z5 \* E, C( l8 u& D( ^% ]% M- q- w Height=x;
}
/ T3 e6 G4 Z+ m) Pvoid Human::GetHeight()
{
+ {* f6 K0 ^; g. V cout<<Height;
}
void Human::SetWeight(int y)
' Y; H2 {% X# u{
; ^  R3 o1 |; \  p. s Weight=y;
8 w1 J% B$ U& J# _- R6 U8 ~0 m}
) J6 U+ p) ?% f! A( }, ^3 V& Avoid Human::GetWeight()
, Z5 \4 G! j9 I6 v7 y/ g5 e4 P. d{
! S2 x/ a; W. T+ ^& o cout<<Weight;
}
2 A# S' Z3 n" rvoid main(void)
{
   Human Lee;
   Lee.SetHeight(172);
3 ^0 `6 f4 N% r. L$ y, o, o1 j, X   cout<<"Lee的身高是：";
/ H; H; d8 w5 h. L5 \   Lee.GetHeight();
   cout<<endl;
   Lee.SetWeight(120);
7 j+ G9 p( i8 a. T" c; ]   cout<<"Lee的体重是：";
/ h. m  r$ @& u" D( U4 |   Lee.GetWeight();
   cout<<endl;
" B2 \6 _( J$ u6 k3 `) T, ]- ^}
5 b. {1 n: B# s- r& n/ M) ?. ?' S7 C1 S推荐第二种写法
! c6 |# Q' E1 w

- a* l, ?5 d- f1 }6 }