C++ 运算符重载的问题
以下代码不知问题处于何处 在vc++6.0上可以通过 但是在学校的online judge 上就过不了 出现编译错误#include <iostream>
#include <iomanip>
using namespace std;
class RMB;
RMB operator -(RMB& ,RMB&);
RMB operator --(RMB& );
class RMB
{
public:
RMB(int ,int ,int );
void initial(int ,int ,int);
void display(ostream&);
RMB operator ++(int);
RMB operator +(RMB& );
friend RMB operator --(RMB& );
friend RMB operator -(RMB& ,RMB&);
protected:
int Yuan;
int Jiao;
int Fen;
};
RMB::RMB(int a,int b,int c)
{
Yuan=a;
Jiao=b;
Fen=c;
}
RMB RMB::operator ++(int)
{
Fen++;
if(Fen>=10)
{
Fen-=10;
Jiao++;
}
if(Jiao>=10)
{
Jiao-=10;
Yuan++;
}
return *this;
}
RMB RMB::operator +(RMB& m)
{
int fen,jiao,yuan;
fen=Fen+m.Fen;
jiao=Jiao+m.Jiao;
yuan=Yuan+m.Yuan;
if(fen>=10)
{
fen-=10;
jiao++;
}
if(jiao>=10)
{
jiao-=10;
yuan++;
}
RMB result1(yuan,jiao,fen);
return result1;
}
RMB operator --(RMB& m)
{
m.Fen--;
if(m.Fen<0)
{
m.Fen+=10;
m.Jiao--;
}
if(m.Jiao<0)
{
m.Jiao+=10;
m.Yuan--;
}
return m;
}
RMB operator -(RMB& m1,RMB& m2)
{
int fen,jiao,yuan;
fen=m1.Fen-m2.Fen;
jiao=m1.Jiao-m2.Jiao;
yuan=m1.Yuan-m2.Yuan;
if(fen<0)
{
fen+=10;
jiao--;
}
if(jiao<0)
{
jiao+=10;
yuan--;
}
RMB result(yuan,jiao,fen);
return result;
}
void RMB::initial(int yuan,int jiao,int fen)
{
Yuan=yuan;
Jiao=jiao;
Fen=fen;
}
void RMB::display(ostream& out)
{
out<<Yuan<<' '<<Jiao<<' '<<Fen<<endl;
}
ostream& operator <<(ostream& o,RMB& m)
{
m.display(o);
return o;
}
int main()
{
RMB A(0,0,0);
RMB B(0,0,0);
int A1,A2,A3;
int B1,B2,B3;
int i=0;
cin>>A1>>A2>>A3;
cin>>B1>>B2>>B3;
A.initial(A1,A2,A3);
B.initial(B1,B2,B3);
cout<<A+B;
cout<<A-B;
for(;i<5;i++)
{
A--;
B++;
}
cout<<A;
cout<<B;
return 0;
}
编译错误：
Main.cc: In function 'int main()':
Main.cc:131: error: no match for 'operator<<' in 'std::cout << A.RMB::operator+(((RMB&)(& B)))'
/usr/include/c++/4.4/ostream:108: note: candidates are: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>& (*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:117: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:127: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:165: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:169: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:173: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:91: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:180: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:105: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:191: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:200: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:204: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:209: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:213: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:221: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:225: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:119: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]
Main.cc:108: note: std::ostream& operator<<(std::ostream&, RMB&)
Main.cc:132: error: no match for 'operator<<' in 'std::cout << operator-(((RMB&)(& A)), ((RMB&)(& B)))'
/usr/include/c++/4.4/ostream:108: note: candidates are: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>& (*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:117: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:127: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:165: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:169: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:173: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:91: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:180: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:105: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:191: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:200: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:204: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:209: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:213: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:221: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:225: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:119: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]
Main.cc:108: note: std::ostream& operator<<(std::ostream&, RMB&)
Main.cc:135: error: no 'operator--(int)' declared for postfix '--', trying prefix operator instead
以下是内容：
PDE运算符重载之人民币运算
Description
人民币包含元角分三个成员，包括操作：初始化、递增、递减、相加、相减、显示
递增，用运算符++表示，实际操作是加1分，用成员函数重载的方法（非友元）
递减，用运算符--表示，实际操作是减1分，用友元方法进行重载
相加，用运算符+表示，操作是两个人民币对象相加，分别对元角分三个成员相加，如果有进位还要高位加1低位减10，对+用成员函数重载的方法
相减，用运算符-表示，操作是两个人民币对象相减，分别对元角分三个成员相减，如果有借位还要高位减加1低位加10，对-用友元方法进行重载
初始化，就是对元角分进行设置
显示，用运算符<<表示，输出格式为：元-角-分，用友元方法或外部函数的方法进行重载都可以
Input
输入两行，每行输入一个人民币对象的元角分数值
Output
假定两个人民币对象为A\B
第一行输出A+B的结果，必须使用运算符+
第二行输出A-B的结果，必须使用运算符-
第三行输出A--5次的结果，必须使用运算符--
第四行输出B++5次的结果，必须使用运算符++
上述所有输出必须使用重载运算符<<
