Î÷°²Ê¯ÓÍ´óѧ´ó¶þ£¨ÉÏ£©C++ÃæÏò¶ÔÏó³ÌÐòÉè¼Æ¿Î¼þ¸÷ÕÂϰÌâ ÏÂÔØ±¾ÎÄ

Date_Time( ):Date(),Time(){};

Date_Time(int y,int mo,int d,int h,int mi,int s): };

void main( ) {

Date_Time dt_a, dt_b(2002,10,1,6,0,0); dt_a.PrintDate_Time(); dt_b.SetTime(23,59,59); dt_b.PrintDate_Time(); dt_a.SetDate(2002,12,31); dt_a.PrintDate_Time(); }

Date(y,mo,d), Time(h,mi,s){}

void PrintDate_Time(){PrintDate();PrintTime();}

£¨5£©

#include class Date { public:

Date(int y=2001,int m=1,int d=1){Year=y; Month=m; Day=d;} void PrintDate(){ cout<

int Year,Month,Day; };

class Time { public:

Time(int h=5,int m=30,int s=0){Houre=h; Minutes=m; Seconds=s;} void PrintTime()

{ cout<

int Houre, Minutes, Seconds; };

class Date_Time: public Date, public Time { public:

Date_Time( ){};

Date_Time(int y,int mo,int d,int h=0,int mi=0,int s=0):

33

Date(y,mo,d), Time(h,mi,s){}

void PrintDate_Time(){PrintDate();PrintTime();}

};

void main( ) {

Date_Time a, b(2002,10,1,6,20,0), c(2003,3,8,6,7); a.PrintDate_Time(); b.PrintDate_Time(); c.PrintDate_Time(); }

6£©

#include class Base { public:

Base (int i,int j){ x0=i; y0=j;} void Move(int x,int y){ x0+=x; y0+=y;}

void Show(){ cout<<\private: int x0,y0; };

class Derived: private Base { public:

Derived(int i,int j,int m,int n):Base(i,j){ x=m; y=n;} void Show (){cout<<\ void Move1(){Move(2,3);} void Show1(){Base::Show();} private: int x,y; };

void main( ) {

Base b(1,2); b.Show();

34

£¨

Derived d(3,4,10,15); d.Move1(); d.Show(); d.Show1(); }

7£©

#include class Point {

public:

void InitP(float x0=0, float y0=0) {X=x0;Y=y0;} void Move(float xf, float yf) {X+=xf;Y+=yf;} float GetX() {return X;} float GetY() {return Y;} private: float X,Y; };

class Rectangle: public Point {

public:

void InitR(float x, float y, float w, float h) { InitP(x,y);W=w;H=h;

}

void ZoomR(float k){W*=k,H*=k;} float GetH() {return H;} float GetW() {return W;} private: float W,H; };

void main() {

Rectangle rect;

rect.InitR(10,20,30,40);

cout<

<

35

£¨

cout<

cout<

9.18 Éè¼ÆÒ»¸öµãÀ࣬Ëü½ö°üº¬Á½¸öÊôÐÔ£ººá×ø±êºÍ×Ý×ø±ê¡£Í¨¹ý¼Ì³ÐµãÀàÔÙÉè¼ÆÒ»¸öÔ²À࣬Ëü³ýÁËÓÐÒ»¸öÔ²ÐÄ£¬»¹Óа뾶£¬»¹Ó¦¸ÃÄܹ»¼ÆËãÔ²µÄÖܳ¤ºÍÃæ»ýµÈ¡£±àдһ¸ö²âÊÔ³ÌÐòÀ´²âÊÔËùÉè¼ÆµÄÀàÄÜ·ñʵÏÖÔ¤¶¨µÄ¹¦ÄÜ¡£

9.19 Éè¼ÆÒ»¸ö¶¯ÎïÀ࣬Ëü°üº¬Ò»Ð©¶¯ÎïµÄÊôÐÔ£¬ÀýÈçÃû³Æ¡¢´óС¡¢ÖØÁ¿µÈ£¬¶¯Îï¿ÉÒÔÅÜ»ò×ß¡£È»ºóÉè¼ÆÒ»¸öÄñÀ࣬³ýÁ˶¯ÎïµÄ»ù±¾ÊôÐÔÍ⣬Ëü»¹ÓÐ×Ô¼ºµÄÓðë¡¢³á°òµÈ£¬Äñ³ýÁËÅÜ»ò×ßÍ⣬Ëü»¹¿ÉÒÔ·ÉÏ衣ΪÁ˼̳ж¯ÎïÀàµÄÌØÐÔ£¬ÄñÀàÓ¦¸Ã¼Ì³Ð¶¯ÎïÀà¡£±àдһ¸ö²âÊÔ³ÌÐòÀ´²âÊÔËùÉè¼ÆµÄÄñÀàÄÜ·ñʵÏÖÔ¤¶¨µÄ¹¦ÄÜ¡£ 9.20 ÏÈÉè¼ÆÒ»¸ö³¤·½ÐÎÀ࣬ÔÙͨ¹ý¼Ì³Ð³¤·½ÐÎÀàÉè¼ÆÒ»¸öÕý·½ÐÎÀ࣬Õý·½ÐÎÀàÖÐͨ¹ý¸²¸Ç¸¸ÀàµÄ³ÉÔ±º¯ÊýµÃµ½Ò»Ð©ÐµĹ¦ÄÜ¡£ 9.21 ÏÈÉè¼ÆÒ»¸ö»ù±¾ÕË»§À࣬ÔÙͨ¹ý¼Ì³Ð»ù±¾ÕË»§ÀàÉè¼ÆÒ»¸ö´¢ÐîÕÊ»§À࣬´¢ÐîÕÊ»§ÀàÖÐÔö¼ÓÒ»¸ö¾²Ì¬³ÉÔ±±äÁ¿£¨ÄêÀûÂÊ£©£¬²¢Ôö¼ÓÈçϳÉÔ±º¯Êý£º £¨1£©¼ÆËãÔÂÀûÏ¢£º´æ¿î½ð¶î*ÄêÀûÂÊ/12 £¨2£©¸ü¸ÄÀûÂÊ£¨¾²Ì¬·½·¨£©£ºÖØÐÂÉèÖÃÄêÀûÂÊ

×îºó£¬±àдһ¸ö²âÊÔ³ÌÐòÀ´²âÊÔËùÉè¼ÆµÄ´¢ÐîÕÊ»§ÀàÄÜ·ñʵÏÖÔ¤¶¨µÄ¹¦ÄÜ¡£ 9.22 ÏÈÉè¼ÆÒ»¸ö»ù±¾ÕË»§À࣬ÔÙͨ¹ý¼Ì³Ð»ù±¾ÕË»§ÀàÉè¼ÆÒ»¸ö´¢ÐîÕÊ»§À࣬´¢ÐîÕÊ»§ÀàÖÐÔö¼ÓÃÜÂë¡¢µØÖ·¡¢×îСÓà¶îºÍÀûÂʵȳÉÔ±±äÁ¿£¬²¢Ôö¼ÓÒ»Ð©ÒøÐÐÕÊ»§¾­³£Óõ½µÄ³ÉÔ±º¯Êý£¬ÒªÇó£º

£¨1£©ÀàÖеijÉÔ±º¯Êý¾ßÓÐÊäÈë¡¢Êä³ö´¢»§ÉÏÊöÐÅÏ¢µÄ¹¦ÄÜ¡£ £¨2£©½«Õ˺ÅÉè¼Æ³É²»¿É¸ü¸Ä¡£ £¨3£©ÐÞ¸ÄÃÜÂëʱҪÌṩԭÃÜÂë¡£

9.23 ÔÚÔĶÁ5.6.1½ÚÄÚÈݵĻù´¡ÉÏ£¬½øÒ»²½·ÖÎöͼÊé¹ÝµÄͼÊéºÍÔÓÖ¾¹ÜÀíºÍ½èÔÄ·½Ê½£¬Éè¼ÆÒ»¸ö»ù±¾·ûºÏͼÊé¹Ýʵ¼Ê¹¤×÷·½Ê½µÄͼÊéºÍÔÓÖ¾½èÔÄϵͳ¡£

36