メンバー関数、友元関数++接頭辞接尾辞

#include<iostream> 

using namespace std;  



class over

{

	int i1 , i2 ,i3;



public:

	void init(int I1=0 , int I2 =0, int I3=0);

	void print();



public:

	over operator ++();// 

	over operator++(int);// 



	friend over operator--(over &);// 

	friend over operator--(over & , int );// 

};



void over::init(int I1 , int I2, int I3)

{

	i1 = I1 ;

	i2 = I2 ;

	i3 = I3 ;

}



void over::print()

{

	cout<<"i1 = "<<i1<<" , i2 ="<<i2<<" , i3 ="<<i3<<endl;

}

over over::operator++()// - 

{

	++i1 ;

	++i2 ;

	++i3 ;

	return *this ;

}

over over::operator++(int )// - 

{

	i1++;

	i2++;

	i3++;

	return *this ;

}

over operator--(over & op)//   

{

	--op.i1 ;

	--op.i2 ;

	--op.i3 ;

	return op ;

}

over operator--(over & op , int )// 

{

	op.i1-- ;

	op.i2-- ;

	op.i3-- ;

	return op ;

}

int main()

{   

	 over  ob1 , ob2 , ob3 , ob4 ;

	 ob1.init();

	 ob2.init(7,7,7);

	 ob3.init(11,11,11);

	 ob4.init(13,13,13);



	 ++ob1 ;// over operator++()

	 ob2++;// over operator++(int)

	 --ob3;// over operator--(over&)

	 ob4--;// over operator--(over& ,int)



	 ob1.print();

	 ob2.print();

	 ob3.print();

	 ob4.print();

	  

	 cout<<"-------------------------"<<endl;



	 ob1.operator++();// ,++ob1

	 ob2.operator++(0);// ob2++;

	 operator--(ob3);// --ob3;

	 operator--(ob4,0);// ob4--;



	 ob1.print();

	 ob2.print();

	 ob3.print();

	 ob4.print();



	getchar();

	return 0 ; 

}