Go4Expert - [Help] cos() function with Classes

Code:

NumeroReal.h

Code:





#pragma once



#include <iostream>

#include <cmath>

#include <cstdlib>



using namespace std;



class NumeroReal

{

private:

        double n;



public:

        NumeroReal();                                                                                                          // default constructor

        NumeroReal( double n );                                                                           // parameter constructor

        NumeroReal( const NumeroReal &unNumeroReal ); // copy constructor

        ~NumeroReal();                                                                                                   // destructor

 

        void setNumeroReal( double n );

        double getNumeroReal() const;



        friend ostream &operator << ( ostream &output, const NumeroReal &unNumeroReal );

        friend istream &operator >> ( istream &input, NumeroReal &unNumeroReal );



        NumeroReal cos() const;



};

NumeroReal.cpp

Code:





#include "NumeroReal.h"



NumeroReal::NumeroReal(void)

{

        this->n = 1.0;

}



NumeroReal::NumeroReal( double n ) 

{

        this->n = n;

}



NumeroReal::NumeroReal( const NumeroReal &unNumeroReal )

{

        this->n = unNumeroReal.n;

}



NumeroReal::~NumeroReal(void)

{

}



//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx





void NumeroReal::setNumeroReal( double n )

{

        this->n = n;

}



double NumeroReal::getNumeroReal() const

{

        return ( this->n );

}



//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx



ostream &operator << ( ostream &output, const NumeroReal &unNumeroReal )

{

        output << unNumeroReal.n;

        

        return ( output );

}



istream &operator >> ( istream &input, NumeroReal &unNumeroReal )

{

        cout << "Entre un numero real: ";

        cin >> unNumeroReal.n;



        return ( input );

}





NumeroReal NumeroReal::cos() const

{

        return ( this->cos() );

}

Main.cpp

Code:



#include "NumeroReal.h"



#include <iostream>

#include <cmath>

#include <conio.h>

#include <cstdlib>



using namespace std;



int main ()

{



        NumeroReal n1, n2( 4.0 );



        cout << "Numero Real # 1" << endl;

        cin >> n1;



        cout << "\nNumero Real # 2" << endl;

        cin >> n2;





        cout << cos( n1 ) << "\n\n";



        system("PAUSE");

                return 0;

}

I want to find the cos( n1 ) but when i try to print it it gives me this error:

------ Build started: Project: CalculosNumeros, Configuration: Debug Win32 ------
Compiling...
Main.cpp
c:\documents and settings\mpayne007\my documents\visual studio 2005\projects\calculosnumeros\calculosnumeros\main .cpp(78) : error C2665: 'cos' : none of the 3 overloads could convert all the argument types
c:\program files\microsoft visual studio 8\vc\include\math.h(116): could be 'double cos(double)'
c:\program files\microsoft visual studio 8\vc\include\math.h(503): or 'float cos(float)'
c:\program files\microsoft visual studio 8\vc\include\math.h(551): or 'long double cos(long double)'
while trying to match the argument list '(NumeroReal)'
Build log was saved at "file://c:\Documents and Settings\MPayne007\My Documents\Visual Studio 2005\Projects\CalculosNumeros\CalculosNumeros\Debu g\BuildLog.htm"
CalculosNumeros - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========