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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
301
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
249
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
311
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
245
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
203
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
193
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
189
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
185
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
271
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
226
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
382
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
347
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
381
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
458
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
468
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
229
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
329
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
299
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
241
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
324
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
150
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
226
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
175
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