Error: expected initializer before 'class'

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C++

  #ifndef ARRAY_H
  #define ARRAY_H
  #include <iostream>
  using std:: ostream;
  using std::istream;
  int main()
  class array
{
   friend ostream &operator << (ostream &, const Array &);
   friend istream &operator >> (istream &, Array &);
   public:
   Array (int = 10);
   Array (const Array &);
  ~Array();
  int getSize() const;
  const Array &operator =(const Array &);
  bool operator ==(const Array &) const;
  bool operator!=(const Array &right) const
{
  return! (*this == right);
}
  int &operator[]( int );
  int operator[]( int ) const;
  private:
  int size;
  int *ptr;

};
 #endif

What I have tried:

whats wrong?
how to fix error?

error: expected initializer before 'class'

Posted 11-Jan-20 4:48am

Member 14713436

Updated 12-Jan-20 20:57pm

KarstenK

v2

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[no name] 11-Jan-20 11:01am

"whats wrong?": What I can see, more or less everything is wrong here. I suggest to start with a very simple "Hello World" program to get the basics. Something like this and many more: C++ Hello World with Classes | Studio Freya[^]

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User 11060979 · Answer 1 · 2020-01-11T05:07:00

Solution 1

There are too many things wrong in the code you show. I suggest to work through a very basci c++ "Hello World" example to learn the basics.

E.g: C++ Hello World with Classes | Studio Freya[^]

Posted 11-Jan-20 5:07am

User 11060979

Comments

Maciej Los 11-Jan-20 13:24pm

5ed!

[no name] 11-Jan-20 13:45pm

Thank you Maciej

OriginalGriff · Answer 2 · 2020-01-11T05:49:00

Solution 3

To add to what has been said - and 0x01AA is spot on here - you are missing a semicolon before class.
Change this:

int main()

To this:

int main();

Or this:

int main(){}

That'll fix the one error you have spotted.
There are more, loads of more...

Posted 11-Jan-20 5:49am

OriginalGriff

Comments

Stefan_Lang 13-Jan-20 3:01am

I don't think fixing compiler errors will lead anywhere in this case. This looks more like a case of not knowing how to use code from other source files in C/C++. In the sense of including code rather than #includeing

Rick York · Answer 3 · 2020-01-11T06:33:00

Since this is a header file of your own, the main declaration does not need to be there at all. Also, it is helpful to have proper indentation. Like this:

C++

class Array
{
public:
    Array( int = 10 );
    Array( const Array & );
    ~Array();

    const Array &operator = ( const Array & );
    bool operator == ( const Array & ) const;
    bool operator != ( const Array &right ) const   { return ! ( *this == right ); }
    int & operator [] ( int );
    int operator [] ( int ) const;

    friend ostream & operator << ( ostream &, const Array & );
    friend istream & operator >> ( istream &, Array & );

    int getSize() const;

private:
    int   size;
    int * ptr;
};

steveb · Answer 4 · 2020-01-11T05:14:00

Solution 2

 class array
{
   friend ostream &operator << (ostream &, const Array &);

type names are case sensitive so your "Array" should be "array" as class declaration.

Also since you stripping the std:: namespace your class has a potential collision with the std::array STL type

Posted 11-Jan-20 5:14am

steveb

Stefan_Lang · Answer 5 · 2020-01-12T20:58:00

This looks like you'ce copied fragments of code from two or more sources, without knowing what either does.

In the case of your code, it looks like you tried to incorporated code defining the class Array into your main program. However the way you did it is not how you combine code in C or C++! While I could point out what exactly you did wrong, I instead suggest you read this guide: Headers and Includes: Why and How - C++ Forum[^]

Error: expected initializer before 'class'

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