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RSS订阅原创 重载，覆盖，隐藏
<br />#include <iostream.h>class Base{public: virtual void f(float x) { cout<<"Base::f(float)"<<x<<endl; } void g(float x) { cout<<"Base::g(float)"<<x<<endl; } void h(float x) { cout<<"Base::h(float)"<<x<<endl; }};
2011-01-14 10:53:00
244
原创 类的常量
<br />#include <iostream>using namespace std;class A{public: A(int size); const int SIZE; void go() { cout<<SIZE<<endl; }};A::A(int size):SIZE(size){ }void main(){ A a(100); A b(200); a.go(); b.go();}<br /
2011-01-14 09:46:00
192
原创 函数
<br />#include <iostream.h>int &count(int);int a,b;void main(){int x;cout<<"Input numbers,the 0 is end:/n";/*cin>>x;while(x){count(x)++;cin>>x;}*/do{ cin>>x; count(x)++;}while(x);cout<<"the number of right:"<<a<<
2011-01-14 09:18:00
262
原创 纯虚函数使用
<br />#include <iostream><br />using namespace std;<br />class Figure<br />{<br />protected:<br /> double x,y;<br />public:<br /> void set(double i,double j) {x=i;y=j;}<br /> virtual void area()=0;<br />};<br />class Triangle:public Figure<br />{<br />publ
2011-01-10 17:26:00
195
原创 虚析构函数
<br />#include <iostream>using namespace std;class A{public: virtual ~A() {cout<<"call A::~A()"<<endl;}};class B:public A{char *buf;public: B(int i) {buf=new char[i];} virtual ~B() {delete []buf;cout<<"call B::~()"<<endl;
2011-01-10 17:19:00
172
原创 函数的联系
<br />#include <iostream>using namespace std;class B{public: void f() {cout<<"bf";} virtual void vf() {cout<<"vbf";} void ff() {vf(); f();}; virtual void vff() {vf();f();}};class D:public B{public: void f() {cout<<"df";} voi
2011-01-10 17:10:00
158
原创 内存分配
<br />#include <iostream><br />using namespace std;<br />class A<br />{<br /> int x;<br />public:<br /> void setname(int i)<br /> {x=i;<br /> cout<<x<<endl;<br /> }<br />};<br />class B:public A<br />{<br /> char *y;<br />public:<br /> B() {y=new char[];}<
2011-01-10 16:46:00
140
原创 虚函数调用
<br />#include <iostream>using namespace std;class B{public: void f() {g();} virtual void g() {cout<<"B::g";}};class D:public B{public: void g() {cout<<"D::g";}};void main(){D d;d.f();}
2011-01-10 16:38:00
143
原创 虚函数用法
<br />#include <iostream>using namespace std;class B{public: virtual void f(int i) {cout<<"B::f"<<endl;}};class D:public B{public: int f(char c) {cout<<"D::f..."<<c<<endl;}};void main(){D d;B *pB=&d,&rB=d,b;pB->f('1');
2011-01-10 16:23:00
211
原创 不用指针只能调用基类
<br />#include <iostream>using namespace std;class B{public: virtual void f() {cout<<"B::f"<<endl;}};class D:public B{public: void f() {cout<<"D::f"<<endl;}};void main(){B *pB=&d,&rB=d,b;D d;b=d;b.f();pB->f();r
2011-01-10 16:15:00
182
原创 虚函数特性
#include #include using namespace std;class A{public: void f(int i) {coutf(1);pA=&b; pA->f(1);pA=&c; pA->f(1);pA=&d; pA->f(1);}虚特性在定义和继承他的类
2011-01-10 16:03:00
323
原创 虚函数
<br />#include <iostream>#include <string>using namespace std;class Employee{public: Employee(string Name,string id) {name=Name;Id=id;} string getName() {return name;} string getID() {return Id;} float getSalary() {return 0.0;} void pri
2011-01-10 15:44:00
292
原创 基类与派生类对象的关系
<br />#include <iostream>using namespace std;class A{int a;public: void setA(int x) {a=x;} int getA() {return a;}};class B:public A{int b;public: void setB(int x) {b=x;} int getB() {return b;}};void f1(A a,int x) {a.
2011-01-09 17:32:00
316
原创 虚基类由最终派生类初始
<br />#include <iostream.h>class A{int a;public: A(int x) {a=x;cout<<"Virtual Base A..."<<endl; }};class B:virtual public A{public: B(int i):A(i) {cout<<"Virtual Base B..."<<endl; }};class C:virtual public A{
2011-01-09 17:12:00
398
原创 虚拟继承实现
<br />#include <iostream>using namespace std;class A{int a;public: A() {cout<<"Constructing A"<<endl;}};class B{public: B() {cout<<"Constructing B"<<endl;}};class B1:virtual B,virtual public A{public: B1(int i) {cout<<"C
2011-01-09 16:56:00
416
原创 虚拟继承的定义方式
<br />#include <iostream>using namespace std;class A{public: void vf() {cout<<"I come from class A"<<endl;}};class B:virtual public A {};class C:virtual public A {};class D:public B,public C {};void main(){D d;d.vf();}
2011-01-09 16:38:00
190
原创 多继承方式 构造函数析构函数
<br />#include <iostream>using namespace std;class Base1{private: int x;public: Base1(int a=1) { x=a; cout<<"Base1 constructor x="<<x<<endl; } ~Base1() {cout<<"Base1 destructor..."<<endl;}};class Base2{private: int y;
2011-01-09 16:28:00
280
原创 多重继承的成员名二义性
<br />#include <iostream>using namespace std;class A{public: void f() {cout<<"From A"<<endl;}};class B{public: void f() {cout<<"From B"<<endl;}};class MI:public A,public B{public: void g() {cout<<"From MI"<<endl;}};v
2011-01-09 16:08:00
253
原创 多重继承
<br />#include <iostream>using namespace std;class Base1{private: int x;protected: int getx() { return x; }public: void setx(int a=1) {x=a;}};class Base2{private: int y;public: void sety(int a) {y=a;} int gety()
2011-01-09 15:53:00
207
原创 构造函数和析构函数的调用次序
<br />#include <iostream>using namespace std;class B{public: B() {cout<<"Constructing B"<<endl;} ~B() {cout<<"Destructing B"<<endl;}};class C{public: C() {cout<<"Constructing C"<<endl;} ~C() {cout<<"Destructing C"<<endl;}};c
2011-01-08 16:25:00
277
原创 友元(一)
<br />#include <iostream>using namespace std;class B;class A{private: int x,y;public: A(int i,int j) {x=i;y=j;} int sum(B b);};class B{private: int z;public: B(int i=0) {z=i;} friend int A::sum(B b);};int A::sum(B b)
2011-01-08 15:45:00
127
原创 友元函数(二)
[code]#include using namespace std;class A{private: int x,y;public: A(int i,int j) {x=i;y=j;} int getX() {return x;} int getY() {return y;} friend class B;};class B{private: int z;public: int add(A a) {return a.x+a.y+z;} int mul(A a) {return a.x*a.y*z;} B(
2011-01-08 15:36:00
167
原创 友元函数
#include #include using namespace std;class point{private: int x,y; friend int dist1(point p1,point p2);public: point(int a=10,int b=10) {x=a; y=b; } int getx() {return x;} int gety() {return y;}};int dist1(point p1,point p2){double x=(p2.x-p1.x);double y=
2011-01-08 15:28:00
149
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