我该如何清除错误

问题描述

当我在下面运行代码时，我收到'class fraction'没有名为'inc'的成员

我想以朋友的身份运行所有功能。

请建议



我尝试过：

When I run the code on below, I recieve 'class fraction' has no member named 'inc'
I want to run all functions as friend.
Please advice

What I have tried:

#include <iostream>
#include <string.h>
using namespace std;

class fraction
{
 long num;
 long den;

 public:
 fraction ();
 fraction(long,long);
 fraction(const fraction &);
~fraction();
long getnum (void)const;
long getDen (void)const;
void print  (void);
friend fraction add (const fraction &, const fraction &);
friend fraction sub (const fraction &, const fraction &);
friend fraction mult(const fraction &, const fraction &);
friend fraction div (const fraction &, const fraction &);
friend fraction inc (const fraction &);
};
fraction::fraction(long l_num,long l_den)
{
  num = l_num ;
  den = l_den ;
}
fraction::fraction( )
{
  num = 0L ;
  den = 1L ;
}
fraction::fraction(const fraction& F)
{
    num=F.num;
    den=F.den;
}
fraction:: ~fraction ( )
{
//  cout<<"Destructor"<<endl;
}
long fraction::getDen (void) const
{
  return den ;
}
long fraction::getnum (void) const
{
  return num ;
}
void fraction:: print (void)
{
    if(den==0)
       den=1L;
    cout<<num<<"/"<<den <<endl;
}
fraction add( const fraction &f1,  const fraction &f2)
{
  long num = (f1.getnum ( ) * f2.getDen ( )) + ( f1.getDen ( ) * f2.getnum ( ) );
  long den = (f1.getDen ( ) * f2.getDen ( ));
  return fraction(num, den);
}
fraction sub ( const fraction &f1,  const fraction &f2)
{
  long num = (f1.getnum ( ) * f2.getDen ( )) - ( f1.getDen ( ) * f2.getnum ( ) );
  long den = (f1.getDen ( ) * f2.getDen ( ));
  return fraction(num, den);
}
fraction mult ( const fraction &f1,  const fraction &f2)
{
 long num = (f1.getnum ( ) * f2.getnum ( ));
 long den = (f1.getDen ( ) * f2.getDen ( ));
 return fraction(num, den);
}
fraction div( const fraction &f1,  const fraction &f2)
{
long num = (f1.getnum ( ) * f2.getDen ( ));
long den = (f1.getDen ( ) * f2.getnum ( ));
return fraction(num, den);
}
fraction inc (const fraction &f1)
{
return add(f1,fraction(1,1));
}
int main()
{
fraction f1,f2(5L,0L);
fraction f3(f2);
f1.print();
f2.print();
f3.print();

f3 = add(f3 , fraction (-7,8) );
f1 = add(f2,f3);
f1.print ();

f1 = sub(f2 , f3);
f1.print();

f1 = mult(f2, f3);
f1.print();

f1.inc().inc().print();
f1=div(f2 , f3 );
f1.print();

return 0;
}

推荐答案

class fraction
{
    // ...
    fraction inc();
};

fraction fraction::inc()
{ 
    *this = inc(*this);
    return *this; 
}

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