//Author: Amadeus Bach Vivaldi together with Low Chee Tat 
//Date: 29 May 2002
//Purpose: Help frens: for chan juan
//This program performs simple calculations
//The alignment in this program maybe is a bit mess up, u must adjust by urself,this is simple job
//Good luck


#include <iostream.h>
#include <stdlib.h>


class Calculator{

	private:
		double x,y,z;
		int choice;

	public:
		int Menu();
		void Addition();
		void Substraction();
		void Multiplication();
		void Division();
		void Modulus();

};


void Calculator::Addition()
{
	system("cls");
	cout<<"\n\n	Please enter two numbers for addition: "<<endl;

	cin>>x>>y;

	z=x+y;

	cout<<"The addition of "<<x<<" and "<<y<<" is "<<z<<endl;

	system("pause");

	
}

void Calculator::Substraction()
{
	system("cls");
	cout<<"\n\n	Please enter 2 numbers for substraction: "<<endl;
	cout<<"	Number to be substracted shall be keyed in first "<<endl;

	cin>>x>>y;

	z=y-x;

	cout<<"The substraction of "<<x<<" from "<<y<<" is "<<z<<endl;

	system("pause");

	
}

void Calculator::Multiplication()
{
	system("cls");
	cout<<"\n\n	Please enter 2 numbers for multiplication: "<<endl;

	cin>>x>>y;

	z=x*y;

	cout<<"The multiplication of "<<x<<" and "<<y<<" is "<<z<<endl;

	system("pause");

	
}

void Calculator::Division()
{
	system("cls");
	cout<<"\n\n	Please enter 2 numbers for division: "<<endl;
	cout<<"	Number to be divided shall be keyed in first "<<endl;

	cin>>x>>y;
	
	z=x/y;

	cout<<"The division of "<<x<<" by "<<y<<" is "<<z<<endl;

	system("pause");

	
}

//This part is simply done, errors found with the operator %,therefore this part does'nt work
//Due to limited time, i advise u ask your frens to correct the mistakes 

void Calculator::Modulus()
{
	system("cls");	
	cout<<"Please enter 2 numbers for modulus: "<<endl;
	cout<<"	Number to be modulus shall be keyed in first "<<endl;

	cin>>x>>y;
	
	
	
	cout<<"The modulus of "<<x<<" by "<<y<<" is "<<x%y<<endl;

	system("pause");

	
}//Remember to ask your fren
 
int Calculator::Menu()
{
	system("cls");
	
	cout<<"\n\n\n\n\n\n";
	cout<<"			Mathematic Operation \n"
		  "			-------------------- \n"
		  "			1.Addition			\n"
		  "			2.Substraction		\n"
		  "			3.Multiplication		\n"
		  "			4.Division			\n"
		  "			5.Modulus			\n"
		  "			0.Exit				\n";

	cout<<"\n			Enter Your Choice:";
	cin>>choice;

	return choice;
}

void main()
{
	int choice;
	Calculator calc;

	system("cls");

	cout<<"\n\n\n\n\n\n		Welcome to Chan Juan's calculator of 2 numbers!         \n";
	cout<<"\n		   Subject DACS 2134 DSPT Assignment 1               \n"<<endl;
		  
		  
	system("pause");

	while(choice!=0)
	{
	
		choice=calc.Menu();		
		
		switch(choice)
		{
			case 1: calc.Addition();		break;
			case 2: calc.Substraction();		break;
			case 3: calc.Multiplication();		break;
			case 4: calc.Division();		break;
			case 5: calc.Modulus();			break;
			case 0: exit(1);
				
		}
		
	
	}	
	
}