25.类，对象，成员实例

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第一种写法：
#include <iostream>
using namespace std;
class Human
{
/ B! w% P- V4 S  l2 b* {6 xpublic:
1 r# X+ F& n# V: ~7 M* j. b5 Y void GetHeight(){cout<<Height;}
" B, i4 n! G! V  l$ J void GetWeight(){cout<<Weight;}
( o4 \1 C  ~0 h- G# _8 h void SetHeight(int x){Height=x;}
void SetWeight(int y){Weight=y;}
private:
int Height;
int Weight;
$ e2 ?7 C$ j4 r5 }4 W};
+ z6 n, }! x4 Q0 o8 D3 h
. z% i* k- S8 t! n3 kvoid main(void)
- R: U& ]% J& d4 A1 G{
; t6 ?& Q9 [6 Y   Human Lee;
9 K' k- ~' Z" }3 Z0 T+ B# F! e: w9 \   Lee.SetHeight(172);
/ s+ C# z# c3 Z( c* N" P   cout<<"Lee的身高是：";
   Lee.GetHeight();
* j" K4 d7 ^) F) y) `   cout<<endl;
. I: ^$ V, M5 J3 s( F* j7 ^   Lee.SetWeight(120);
! \0 X$ F' R) a   cout<<"Lee的体重是：";
   Lee.GetWeight();
( K' D) i; ^+ ~   cout<<endl;
. w+ e& W4 z" H5 |/ g7 ]$ Z0 U( `}
第二种写法：
#include <iostream>
* _7 l; z( z& ~$ N) |using namespace std;
+ w, y9 [- B7 H" B7 p: U  _* eclass Human
{
public:
7 ^: A' S, b! i9 ] void GetHeight();
    void GetWeight();
void SetHeight(int x);
void SetWeight(int y);
5 ^) H/ j% O+ }. i6 bprivate:
9 ^* S$ V" _8 Y2 P0 ` int Height;
6 {% ]" H, c, K' [9 G; g, ^! y$ C int Weight;
};
6 P. A- M& Y4 X8 Q& Lvoid Human::SetHeight(int x)
# `  W0 \5 p) w' d' C{
Height=x;
! {/ s" G3 _1 W; T( ~}
0 s/ f% l% K, Rvoid Human::GetHeight()
{
' ]: ]2 y" `3 ?9 v, _, U cout<<Height;
5 u$ c  j' F1 W; q+ `}
void Human::SetWeight(int y)
{
Weight=y;
8 q3 V/ F" O. I- Y% Y}
* W6 h+ P% S' A2 H: p& Tvoid Human::GetWeight()
{
4 J, A& G) ^! D* {' D/ ~ cout<<Weight;
9 \  x+ C3 b( m5 q  O}
void main(void)
5 r5 j4 o7 j, e0 x{
! o* r! P8 c+ M- J( b   Human Lee;
- v- c+ i! i) N2 H6 j   Lee.SetHeight(172);
+ e, a+ ?  M# p6 A( \8 v   cout<<"Lee的身高是：";
/ _; u; u2 t7 K8 ^7 w/ Z! X   Lee.GetHeight();
5 q) T: @2 L. U5 S. p   cout<<endl;
7 x* |6 N) ~/ e3 ]5 Q9 }- w2 e   Lee.SetWeight(120);
   cout<<"Lee的体重是：";
   Lee.GetWeight();
   cout<<endl;
}
- j& d5 m1 q" g推荐第二种写法