operators << and >>

How to overload the << and >> operator
i have class like this:

Code:

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class kom
{
private:
int a,b;
char d;
float x,y;
public:
kom(){}
kom(int l,int m,char n,float i,float j)
{
a=l; b=m; d=n; i=x; y=j;
}
}

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i now a litle how to do this

Code:

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friend kom  operator<<(ostream, out_file)
{
cout<<a<<b<<d<<x<<y<<'\n';
}

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i know this is not correct but i dont know the right way

1. You declare it to be a friend only in the class body.

Code:

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class kom
{
friend ostream& operator<<(ostream& out, const kom&);
//other data
}; //<===Don't forget the semicolon after the class declaration

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you define it elsewhere without the friend directive because outside the class it would mean it's a friend to the global scope, which wouldn't be much use

Code:

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class kom
{
//other data
};

//defined outside the scope of kom
ostream& operator<<(ostream& out, const kom&)
{
//don't use cout, cout is the standard output, you want
//to use any output stream such as a file or string stream or any
//other stream object
  out <<a<<b<<d<<x<<y<<'\n';
  return out; //remember to return it.
}

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now you can use it as such

Code:

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int main()
{
  ofStream outfile("output.txt");
  ostringstream outsstream;
  kom aKom;
  //do whatever it is you want with your class
  cout << aKom;
  outfile << aKom;
  outsstream << aKom;
  return 0;
}

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