How can I clear the error

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1.00/5 (3 votes)

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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;
}

Posted 3-Mar-17 0:59am

Mwater07

Updated 3-Mar-17 1:25am

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Comments

[no name] 3-Mar-17 7:10am

fraction::inc

Richard MacCutchan 3-Mar-17 7:15am

Read your code first.

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Jochen Arndt · Answer 1 · 2017-03-03T01:25:00

You have declared member functions for the operations but did not provide definitions (implementations). Your exiting implementations are global functions and not member functions of the fraction class (the global functions are declared when defined).

Also you are calling inc() without parameter while you only have a inc(const fraction &). So you would have to use inc(f1) instead of f1.inc().

But to concatenate operations they must be performed on the object and change the content. So add the missing member function definition(s) omitting one parameter:

C++

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

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