C++的技术问题

[cndnc9m]

这是C++的一个程序，在编译的时候会出错，帮我看一下怎么改
#include<iostream.h>
class Number
{
public :
Number() throw();
~Number() throw();
Number(const Number& n) throw();
Number& operator=(const Number&n) throw();
Number& operator++() throw();
Number operator++ (int) throw();
};
Number::Number() throw()
{}
Number::~Number() throw()
{
cout<<”dtor”;
}
Number::Number(const Number& n) throw() //产生Number的两个拷贝
{
cout<<”copy”;
}
Number& Number::operator=(const Number& n) throw()
{
cout<<”assign”; return *this;
}
Number& Number::operator=(const Number& n) throw()
{
cout<<”increament”; return *this;
}
Number Number::operator++ (int) throw()
{
Number old=*this;
++(*this);
return old; //返回局部变量old
}
int main()
{
Number n;
cout<<”++n: “; ++n;cout<<’\n’;
cout<<” n++: “; n++;cout<<’\n’;
}

[JJZHK]

Number::operator=
重复实现，为什么要有两个Number::operator=实现？

[lzr4304061988012]

#include <iostream> 
using namespace std;
class Number 
{ 
public : 
Number() throw(); 
~Number() throw(); 
Number(const Number& n) throw(); 
Number& operator=(const Number&n) throw(); 
Number& operator++() throw(); 
Number operator++ (int)  throw(); 
}; 
Number::Number() throw() 
{} 
Number::~Number() throw() 
{ 
cout <<"dtor"; 
} 
Number::Number(const Number& n) throw()  //产生Number的两个拷贝 
{ 
cout <<"copy"; 
} 
/*Number& Number::operator=(const Number& n) throw() //这个重复了；
{ 
cout <<"assign"; return *this; 
} */
Number& Number::operator=(const Number& n) throw() 
{ 
cout <<"increament"; return *this; 
} 
Number & Number::operator++ () throw() //这个未定义；
{
	cout<<"++Number"<<endl;
	return *this;
}
Number Number::operator++ (int) throw() 
{ 
Number old=*this; 
++(*this); 
return old; //返回局部变量old 
} 
int main() 
{ 
Number n; 
/*cout <<"++n: "; 
++n;*/
cout <<'\n'; 
cout <<" n++: "; 
n++;
cout <<'\n'; 
} 

[lzr4304061988012]

#include <iostream> 
using namespace std;
class Number 
{ 
public : 
Number() throw(); 
~Number() throw(); 
Number(const Number& n) throw(); 
Number& operator=(const Number&n) throw(); 
Number& operator++() throw(); 
Number operator++ (int)  throw(); 
}; 
Number::Number() throw() 
{} 
Number::~Number() throw() 
{ 
cout <<"dtor"; 
} 
Number::Number(const Number& n) throw()  //产生Number的两个拷贝 
{ 
cout <<"copy"; 
} 
/*Number& Number::operator=(const Number& n) throw() 
{ 
cout <<"assign"; return *this; 
} */
Number& Number::operator=(const Number& n) throw() 
{ 
cout <<"increament"; return *this; 
} 
Number & Number::operator++ () throw() 
{
	cout<<"++Number"<<endl;
	return *this;
}
Number Number::operator++ (int) throw() 
{ 
Number old=*this; 
++(*this); 
return old; //返回局部变量old 
} 
int main() 
{ 
Number n; 
cout <<"++n: "; 
++n;
cout <<'\n'; 
cout <<" n++: "; 
n++;
cout <<'\n'; 
}