给自己看的贴

#include "iostream"
using namespace std;
template <class T>
T MaxElement(T a[],int size)
{
T tmpMax=a[0];
for(int i=1;i<size;++i)
if(tmpMax<a[i])
tmpMax=a[i];
return tmpMax;
}
class CFraction
{
int numerator;
int denominator;
public:
CFraction(int n,int d):numerator(n),denominator(d){};
bool operator<(const CFraction &f)const
{
if(denominator * f.denominator>0)
return numerator *f.denominator<denominator*f.numerator;
else
return numerator *f.denominator>denominator*f.numerator;
}
bool operator==(const CFraction & f)const
{
return numerator *f.denominator==denominator*f.numerator;
}
friend ostream &operator<<(ostream &o,const CFraction &f);
};
ostream &operator<<(ostream &o,const CFraction &f)
{
o<<f.numerator<<"/"<<f.denominator;
return o;
}
int main()
{
int a[5]={1,5,2,3,4
};
CFraction f[4]={CFraction(8,6),CFraction(-8,4),CFraction(3,2),CFraction(5,6)
};
cout<<MaxElement(a,5)<<endl;
cout<<MaxElement(f,4)<<endl;
return 0;
}

#include "iostream"
using namespace std;
template<class T>
T Max(T a,T b)
{
cout<<"Template Max 1"<<endl;
return 0;
}
template<class T,class T2>
T Max(T a,T2 b)
{
cout<<"Template Max 2"<<endl;
return 0;
}
double Max(double a,double b)
{
cout<<"F Max"<<endl;
return 0;
}
int main()
{
int i=4,j=5;
Max(1.2,3.4);
Max(i,j);
Max(1.2,3);
return 0;
}

this指针2：
#include "iostream"
using namespace std;
class Complex
{
public:
double real,imag;
Complex(double r,double i):real(r),imag(i){}
Complex AddOne()
{
this->real++;
return *this;
}
};
int main()
{
Complex c1(1,1),c2(0,0);
c2=c1.AddOne();
cout<<c2.real<<","<<c2.imag<<endl;
return 0;
}

#include "string"
#include "cstdlib"
#include "iostream"
using namespace std;
class Complex
{
double real,imag;
public:
Complex(double r=0,double i=0):real(r),imag(i){};
friend ostream & operator<<(ostream & os,const Complex &c);
friend istream & operator>>(istream & is, Complex &c);
};
ostream & operator<<(ostream & os,const Complex &c)
{
os<<c.real<<"+"<<c.imag<<"i";
return os;
}
istream & operator>>(istream & is, Complex &c)
{
string s;
is>>s;
int pos=s.find("+",0);
string sTmp=s.substr(0,pos);
c.real=atof(sTmp.c_str());
sTmp=s.substr(pos+1,s.length()-pos-2);
c.imag=atof(sTmp.c_str());
return is;
}
int main()
{
Complex c;
int n;
cin>>c>>n;
cout<<c<<","<<n;
return 0;
}

14.3.1
#include "iostream"
using namespace std;
class CBase
{
int nPrivate;
public:
int nPublic;
protected:
int nProtected;
};
class CDerived:public CBase
{
void AccessBase()
{
nPublic=1;
nPublic=1;
nProtected=1;
CBase f;
f.nProtected=1;
}
};
int main()
{
CBase b;
CDerived d;
int n=b.nProtected;
n=d.nPrivate;
int m=d.nPublic;
return 0;
}

给你个更好点的网站贴这些东西
codepad.org

14.4.1:
#include "iostream"
using namespace std;
class CBug
{
int legNum,color;
public:
CBug(int ln,int c1):legNum(ln),color(c1)
{
cout<<"sdsaaaaaa"<<endl;
}
~CBug()
{
cout<<"sdgsgBBBBBB"<<endl;
}
void PintInfo()
{
cout<<legNum<<","<<color<<endl;
}
};
class CFlyingBug:public CBug
{
int wingNum;
public:
CFlyingBug(int ln,int c1,int wn):CBug(ln,c1),wingNum(wn)
{
cout<<"safsdgCCCCCCCC"<<endl;
}
~CFlyingBug()
{
cout<<"sdsdDDDDDDDDDD"<<endl;
}
};
int main()
{
CFlyingBug fb(2,3,4);
fb.PintInfo();
return 0;
}

14.5.1:
#include "iostream"
using namespace std;
class A
{
public:
int n;
A(int i):n(i)
{
cout<<"A"<<n<<"constructed"<<endl;
}
~A()
{
cout<<"A"<<n<<"destructed"<<endl;
}
};
class B:public A
{
public:
B(int i):A(i)
{
cout<<"B constructed"<<endl;
}
~B()
{
cout<<"B destructed"<<endl;
}
};
class C:public B
{
public:
C():B(2)
{
cout<<"C constructed"<<endl;
}
~C()
{
cout<<"C destructed"<<endl;
}
};
int main()
{
C obj;
return 0;
}

#include "iostream"
using namespace std;
class CEmployee
{
string name;
int age;
char gender;
public:
CEmployee()
{
cout<<"ssAAAAAAAAA"<<endl;
}
void PrintBasicInfo()
{
cout<<"Name:"<<name<<endl;
cout<<"Name111:"<<age<<endl;
cout<<"Name222:"<<gender<<endl;
}
void SetBasicInfo(const string & name_,int age_,int gender_)
{
name=name_;
age=age_;
gender=gender_;
}
};
class CSalesman:public CEmployee
{
protected:
int salesVolume;
};
class CManager:public CEmployee
{
protected:
int totalSubordinates;
};
class CSalesManager:public CSalesman,public CManager
{
public:
void setInfo(int sv,int sn)
{
salesVolume=sv;
totalSubordinates=sn;
}
void PrintInfo()
{
CSalesman::PrintBasicInfo();
cout<<"Sales Volume:"<<salesVolume<<endl;
cout<<"Total Subordinates:"<<totalSubordinates<<endl;
}
};
int main()
{
CSalesManager sm;
sm.CSalesman::SetBasicInfo("Tom",24,'M');
sm.setInfo(100000,20);
sm.PrintInfo();
return 0;
}

15.1.1:
#include "iostream"
using namespace std;
class A
{
public:
virtual void Print(){cout<<"AAAAAAAAA"<<endl;
}
};
class B:public A
{
public:
virtual void Print(){cout<<"BBBBBBBBBBB"<<endl;
}
};
class D:public A
{
public:
virtual void Print(){cout<<"DDDDDDDDDDDDDD"<<endl;
}
};
class E:public B
{
public:
virtual void Print(){cout<<"EEEEEEEEEE"<<endl;
}
};
int main()
{
A a;B b;D d;E e;
A *pa=&a;
B *pb=&b;
pa->Print();
pa=pb;
pa->Print();
pa=&d;
pa->Print();
pa=&e;
pa->Print();
return 0;
}

15.1.2:
#include "iostream"
using namespace std;
class A
{
public:
virtual void Print(){cout<<"AAAAAAAAA"<<endl;
}
};
class B:public A
{
public:
virtual void Print(){cout<<"BBBBBBBBBBB"<<endl;
}
};
void PrintInfo(A &r)
{
r.Print();
}
int main()
{
A a;B b;
PrintInfo(a);
PrintInfo(b);
return 0;
}

15.2.1:
#include "cmath"
#include "iostream"
using namespace std;
class CShape
{
public:
virtual double Area(){
return 0;
}
virtual void PrintInfo(){
}
};
class CRectangle:public CShape
{
public:
int w,h;
virtual double Area();
virtual void PrintInfo();
};
class CCircle:public CShape
{
public:
int r;
virtual double Area();
virtual void PrintInfo();
};
class CTriangle:public CShape
{
public:
int a,b,c;
virtual double Area();
virtual void PrintInfo();
};
double CRectangle::Area()
{
return w*h;
}
void CRectangle::PrintInfo()
{
cout<<"RE:"<<Area()<<endl;
}
double CCircle::Area()
{
return 3.14*r*r;
}
void CCircle::PrintInfo()
{
cout<<"CI:"<<Area()<<endl;
}
double CTriangle::Area()
{
double p=(a+b+c)/2.0;
return sqrt(p*(p-a)*(p-b)*(p-c));
}
void CTriangle::PrintInfo()
{
cout<<"TR:"<<Area()<<endl;
}
CShape *pShapes[100];
int Mycompare(const void *s1,const void *s2)
{
CShape **p1=(CShape **)s1;
CShape **p2=(CShape **)s2;
double a1=(*p1)->Area();
double a2=(*p2)->Area();
if(a1<a2)
return -1;
else if(a2<a1)
return 1;
else
return 0;
}
int main()
{
int i,n;
CRectangle *pr;CCircle *pc;CTriangle *pt;
cin>>n;
for(i=0;i<n;i++)
{
char c;
cin>>c;
switch(c)
{
case'R':
pr=new CRectangle();
cin>>pr->w>>pr->h;
pShapes[i]=pr;
break;
case'C':
pc=new CCircle();
cin>>pc->r;
pShapes[i]=pc;
break;
case'T':
pt=new CTriangle();
cin>>pt->a>>pt->b>>pt->c;
pShapes[i]=pt;
break;
}
}
qsort(pShapes,n,sizeof(CShape *),Mycompare);
for(i=0;i<n;i++)
{
pShapes[i]->PrintInfo();
delete pShapes[i];
}
return 0;
}