C++ language

#include<iostream>
class Cals 		  // Base class
{
private:
float number1 ; // private member and data can't inherited
public:
float number2;    // The public member and data are inheritable
void getdata()	 // The public member and data are inheritable
{
cout << 
"\n Enter the number1 of the Cals : "; 
cin >> number1 ;
cout << 
"\n Enter the number2of the Cals : "; 
cin >> number2;
}
float first_number()			
// The public member and data are inheritable
{ return number1 ; } 
}; 				         // End of the class definition	

class Calculate : 
public Cals 		 //Derived class
{ 
private:
float result1 ,result2,result3,result4;
public:
void sum(void)
{ 
	result1 = first_number() + number2;
	//number1 can't access directly because its a private member of base class
} 
void substract(void)
{ 
	result2 = first_number() - number2;
	//number1 can't access directly because its a private member of base class
} 
void multi(void)
{ 
	result3 = first_number() * number2;
	//number1 can't access directly because its a private member of base class
} 
void div(void)
{ 
	result4 = first_number() / number2;
	//number1 can't access directly because its a private member of base class
} 

void Display(void)
{
cout << 
"\n number1 = " << first_number() ; 
//number1 can't access directly because its a private member of base class
cout << 
"\n number2= " << number2;
cout << 
"\n sum is = " << result<< "\n substraction is = " 
<<result2<< 
"\n multiplication is = "<<result3<< 
"\n division  is = "<<result4;
}
};			     // End of the derived class definition 
void main(void)
{
Calculate cal ;
cal.first_number():	 
// The public member and data so its access through the object of derived class.
cal.sum( );
cal.substract( );
cal.multi( );
cal.div( );
cal.Display( );
}

 class derive: public 
 base,public base1, 
 public base2
{
.....
.....
.....       //member of derive class
};

#include<iostream>
using namespace inherit;

class base1	  //base class1
{
	protected:
		int a;
	public:
		void get_data(int);
};


class base2		 //base class2
{
	protected:
		int b:
	public:
		void get_data1(int);
};


class derive: 
public base1,public base2		
//derived class inherit the feature and attribute of base1 class, base2 class
{
	public:
		void display(void);
};
void base1::get_data(int i)
{
	 a=i;
}
void base2::get_data1(int j)
{
	b=j;
}
void derive::display(void)
{
	cout<<
	"value of base1 class variable is="<<a<<
	"\n";
	cout<<
	"value of base2 class variable is="<<b<<
	"\n";
	cout<<
	"result of a*b="<<a*b<<
	"\n";
}
int main()
{
	derive der;
	der.get_data(200);
	der.get_data1(300);
	der.display();
	return 0;
}