passing class

This is a discussion on passing class within the C++ Programming forums, part of the General Programming Boards category; how can i pass a class variable to a public function of the class and then return the class variable ...

  1. #1
    Registered User
    Join Date
    Jan 2002
    Posts
    39

    Unhappy passing class

    how can i pass a class variable to a public function of the class and then return the class variable with the modifications?

  2. #2
    Unregistered
    Guest
    You don't need to pass a class variable to a class function. The class function has access to all class data variables already. like this:

    Code:
    #include <iostream.h>
    
    class Sample
    {
      public:
        Sample();
        int getData();
        void ModifyData();
      private:
        int data;
    };
    
    Sample::Sample() : data(3)
    {}
    
    int Sample::getData()
    {
      return data;
    }
    
    void Sample::ModifyData()
    {
      data += 4;
    }
    
    int main()
    {
      Sample sample;
      cout << "data before modification = " << sample.getData() << endl;
      sample.ModifyData();
      cout << "data after modification = " << sample.getData() << endl;
      return 0;
    }
    if you want to display modified variable directly from ModifyData you could do this:

    Code:
    #include <iostream.h>
    
    class Sample
    {
      public:
        Sample();
        int getData();
        int ModifyData();
      private:
        int data;
    };
    
    Sample::Sample() : data(3)
    {}
    
    int Sample::getData()
    {
      return data;
    }
    
    int Sample:: ModifyData()
    {
      data += 4;
      return data;
    }
    
    int main()
    {
      Sample sample;
      cout << "data before modification = " << sample.getData() << endl;
      cout << "data after modification = " << sample.ModifyData() << endl;
      return 0;
    }

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