How to access members of a class with a class vector

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How to access members of a class with a class vector

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#1 by (0 votes)

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I have the CClass class

//clase.h
class CClass{

public:

int suma (int X, int Y);

private:

int X;
int Y;
}

//clase.cpp

//constructor aqui

int
CClass::suma(intX, int Y){

int resultado = 0;

resultado = X + Y;

return resultado;
}

And in main.cpp I have created a block of memory with several objects of the class CClass with the help of a for and a pointer

//main.cpp

ifstream  fitxer(fichero);

if (fitxer.is_open())
{

   int = 0;

   delete[] m_Clase; //m_Clase es un apuntador al objeto de la clase declarado en main.h

   m_Clase = new CClass [10]; //reservo un bloque de memoria para 10 objetos CClass

   for (i=0; i<10; i++){

      is >> m_Clase[i];
   }

   fitxer.close();
}

Now I want to include a function in main.cpp to add the result of all the 'sum' functions of the different CClass objects

int suma total(/*???*/){

int total = 0;

//total = suma() + suma() + suma ()... etc
}

But I have no idea what variables I have to pass or how to complete it.

c++

asked by Badwolf 04.04.2017 в 20:38

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1 answer

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score 0 · Answer 1

But I have no idea what variables I have to pass him.

With the code provided, you have two options:

Pointer and size.

This approach is traditional in C, and equally valid in C ++ although less used.

int suma_total(const CClass *const arreglo, int tamanyo){

    int total = 0;

    for (int indice = 0; indice < tamanyo; ++indice)
        total += arreglo[índice].suma(?, ?);

    return total;
}

The call in main would look like:

m_Clase = new CClass [10];

// ...

int suma = suma_total(m_Clase, 10);

Start and end pointer.

This approach is traditional in C ++, and equally valid in C but less used.

int suma_total(const CClass *const inicio, const CClass *const fin){

    int total = 0;

    for (const CClass *clase = inicio; clase != fin; ++clase)
        total += clase->suma(?, ?);

    return total;
}

The call in main would look like:

m_Clase = new CClass [10];

// ...

int suma = suma_total(m_Clase, m_Clase + 10);

Problems.

The suma total function is misnamed, C ++ does not allow identifiers that contain spaces.

Parameter intX of CClass::suma is incorrect, I assume you wanted int X .

Parameters X e Y of function CClass::suma mask members X e Y of class CClass , use other names for parameters or for members.

Do not know what parameters you use X e Y of the function suma total , do you want to add the values of each instance of CClass or add values that will be provided from outside the class?

You may have more questions after reading this answer, do not hesitate to ask new questions.