import java.awt.*;
import java.io.*;
import java.text.DecimalFormat;

public class shapes
{
	
public static void main(String[] args)
{		
		int g = 0;
		double a = 0;
		double b = 0;
		System.out.println("This program will determine the area of multiple shapes.");
		System.out.println("          ");
		menu(a, b, g);
		
}
	
public static double menu(double a, double b, int g)
{
	int choice = 0;
	String banana;
	
	System.out.println("Get the area of a:");
	System.out.println("\t1. Triangle");
	System.out.println("\t2. Rectangle");
	System.out.println("\t3. Circle");
	System.out.println("\t4. Pentagon");
	System.out.println("\t5. Hexagon");
	System.out.println("\t6. Octagon");
	System.out.println("\t7. Calculate and Output");
	System.out.println("\t8. End this Program");

	banana = getConsoleString();
	choice = Integer.parseInt(banana);
	
	switch(choice)
	{

	case 1:
	{
		System.out.println("Let's figure out the area of a triangle!");
		System.out.println("Please enter the length of the base: ");
		System.out.println("          ");
		banana = getConsoleString();
		a = Double.parseDouble(banana);
		System.out.println("Please enter the height: ");
		System.out.println("          ");
		banana = getConsoleString();
		b = Double.parseDouble(banana);
		g = 1;
	 
		menu(a, b, g);

	break;
	}

	case 2:
	{
		System.out.println("Let's figure out the area of a rectangle!");
		System.out.println("Please enter the length: ");
		System.out.println("          ");
		banana = getConsoleString();
		a = Double.parseDouble(banana);
		System.out.println("Please enter the width: ");
		System.out.println("          ");
		banana = getConsoleString();
		b = Double.parseDouble(banana);
	
		g = 2;
	 
		menu(a, b, g);	
	
	break;
	}

	
	case 3:
	{
		System.out.println("Let's figure out the area of a circle!");
		System.out.println("Please enter the radius: ");
		System.out.println("          ");
		banana = getConsoleString();
		a = Double.parseDouble(banana);
		b = 0;
		g = 3;
		
		menu(a, b, g);
	break;
	}	
	
	case 4:
	{
		System.out.println("Let's figure out the area of a pentagon!");
		System.out.println("Please enter the apothem: ");
		System.out.println("          ");
		banana = getConsoleString();
		a = Double.parseDouble(banana);
		System.out.println("Please enter the perimeter: ");
		System.out.println("          ");
		banana = getConsoleString();
		b = Double.parseDouble(banana);
		g = 4;
		
		menu(a, b, g);	
	break;
	}
	
	case 5:
	{
		System.out.println("Let's figure out the area of a hexagon!");
		System.out.println("Please enter the apothem: ");
		System.out.println("          ");
		banana = getConsoleString();
		a = Double.parseDouble(banana);
		System.out.println("Please enter the perimeter: ");
		System.out.println("          ");
		banana = getConsoleString();
		b = Double.parseDouble(banana);
		g = 5;
		menu(a, b, g);
	break;
	}
	
	case 6:
	{
		System.out.println("Let's figure out the area of a octagon!");
		System.out.println("Please enter the apothem: ");
		System.out.println("          ");
		banana = getConsoleString();
		a = Double.parseDouble(banana);
		System.out.println("Please enter the perimeter: ");
		System.out.println("          ");
		banana = getConsoleString();
		b = Double.parseDouble(banana);
	 	g = 6;
	 	menu(a, b, g);
	 	break;		
	}
	
	case 7:
	{
	    subcalc calc = new subcalc(a, b, g);//creates an instance of the constructor 	
	    break;
	}
	
	case 8:
	{
		System.out.print ("Buh Bye!");
	    return(0);
	}
	
}

return(0);//end of menu
	}
	
public double Output(double a, double b, int g, double area, String shape)
{
	String banana;	
	System.out.println ("The area of the " + shape + " is " + area + ".");	
	System.out.println();
	banana = getConsoleString();
	
	menu(a, b, g);
	return(0);
	
}
	
	public static String getConsoleString()
	{
	
	int noMoreInput = -1;
	char enterKeyHit = '\n';
	int InputChar;
	
	StringBuffer InputBuffer = new StringBuffer(30);

	try
	{
		InputChar = System.in.read();
		
		while (InputChar != noMoreInput)
		{
			if ((char) InputChar != enterKeyHit)
			{
				InputBuffer.append((char) InputChar);
			}
			else
			{
				InputBuffer.setLength(InputBuffer.length() -1);
				break;
			}
			InputChar = System.in.read();
		}
	}
	catch(IOException IOX)
	{
		System.err.println(IOX);
	}
	return InputBuffer.toString();	
	
}//end of method GetConsoleString()

	


}

import java.awt.*;
import java.io.*;



public class subcalc extends shapes 
{
private double a;
private double b;
private int g;
private double area;
private String shape;

subcalc(double a, double b, int g)// constructor
{
		switch(g)
		{

			case 1:
			{
				areaTriangle();
				shape = "Triangle";
				break;
			}
			
			case 2:
			{
				areaRectangle();
				shape = "Rectangle";
				break;
			}
			
			case 3:
			{
				areaCircle();
				shape = "Circle";
				break;	
			}
			
			case 4:
			{
				areaPentagon();
				shape = "Pentagon";
				break;
			}
			
			case 5:
			{
				areaHexagon();
				shape = "Hexagon";
				break;	
			}
			
			case 6:
			{
				areaOctagon();	
				shape = "Octagon";
			}
			
		}

}


private double areaTriangle()
{
	area = .5 * (a * b);
	finalCalc();
	return(0);	
}



private double areaRectangle()
{
	area = a * b;
	finalCalc();
	return(0);
}


private double areaCircle()
{
	area = Math.PI * (a * a);
	finalCalc();
	return(0);	
}


private double areaPentagon()
{
	area = .5 * (a * b);
	finalCalc();
	return(0);
}

private double areaHexagon()
{
	area = .5 * (a * b);
	finalCalc();
	return(0);
}

private double areaOctagon()
{
	area = .5 * (a * b);
	finalCalc();
	return(0);
	
}

private double finalCalc() //go back to output!
{
	
	shapes orig = new shapes();
	
	
	orig.Output(a, b, g, area, shape);
	return(0);
}



}	// end of subcalc