PRA_29

/*A program to implement concept of virtual base class. */
#include<iostream>
#include<stdlib.h>
using namespace std;
class Calc
{
	protected:
	float a,b;
	public:
		Calc()
		{
			system("CLS");
			cout << "CALCULATOR\n"<<endl;	
		}
};
class Operand_1:virtual public Calc
{
	//protected:
	public:
	void fetchOpn1()
	{
		cout << "Enter Operand 1 : ";
		cin >> a;	
	}	
};
class Operand_2:virtual public Calc
{
	//protected:
	public:
	void fetchOpn2()
	{
		cout << "Enter Operand 2 : ";
		cin >> b;
	}	
};
class Operation :virtual public Calc
{
	protected:
	void choice(int &c)
	{
		switch(c)
		{
			case 1:
				sum(a,b);
				break;
			case 2:
				sub(a,b);
				break;
			case 3:
				mul(a,b);
				break;
			case 4:
				div(a,b);
				break;
			case 5:
				cout << "\nPRESS ENTER...\n";
				exit(0);
				break;
			default:
				cout << "\nEnter Valid Input ...\n";
		}
	}
	void sum(float &x,float &y)
	{
		cout<<x <<" + "<<y <<" = "<<(x+y);
	}
	void sub(float &x ,float &y )
	{
		cout<<x <<" - "<<y <<" = "<<(x-y);
	}
	void mul(float &x ,float &y)
	{
		cout<<x <<" * "<<y <<" = "<<(x*y);
	}
	void div(float &x,float &y)
	{
		cout<<x <<" / "<<y <<" = "<<(x/y);
	}
};
class Ans : public Operand_1 , public Operand_2,public Operation
{
	public:
		Ans()
		{
			fetchOpn1();
			fetchOpn2();
			arithChoice();
		
			cout << endl <<endl ;
			system("PAUSE");
			cout <<flush;
		}
	void arithChoice()
	{
		int n;
			cout << endl<<"1. Sumation  \n2. Subtration\n3. Multiplication\n4. Division\n5. Exit"<<endl;
			cout << endl << "Enter Your Choice : "	;
			cin >> n;
			choice(n);
	}
};
int main()
{
	do
	{
		Ans a;
	}while(1);
	return 0;
}
/*
CALCULATOR

Enter Operand 1 : 55.66
Enter Operand 2 : 55
1. Sumation
2. Subtration
3. Multiplication
4. Division
5. Exit
Enter Your Choice : 1
55.66 + 55 = 110.66

Press any key to continue . . .
*/