/***
 * Dummy program for demonstrating a running time error:
 * Forget to protect it from dividing a number by 0
 *
 */

import java.math.*;

//A simple program that Does percentage operations

public class MathOperation {

	static double pminus (double x, double y){
		return (x-y)*100;
	}

	static double pplus (double x, double y){
		return (x+y)*100;
	}

       static double pmultiply(double x, double y){
                return x*y*100;
        }

       static double pdivide(double x, double y){
               return 100*x / (y*1.0);
        }

        public static void main(String[] args) {
        	double a = MathOperation.pplus(0.4, 0.5);
		double b = MathOperation.pminus(a, 90.00);
		double c= MathOperation.pdivide(100, b);
	            System.out.println("c=" +c + "%\n");
        }
}