double volume;
        double radius;
        double height;
        double cost;
        boolean done = false;
        String donecheck;
        while(!done){
            System.out.println("Input the Volume");
            volume = input.nextDouble();
            System.out.println("Input the radius");
            radius = input.nextDouble();
            height = volume / (Math.PI*radius*radius);
            cost = 2*Math.PI* radius*(radius + height);
            System.out.println("Radius is " + radius);
            System.out.println("Cost is " + cost);
            System.out.println("Type y if you wish to continue");
            donecheck = input.nextLine();
            if(donecheck == "y"){
                done = true;
            }else{
                done = false;
            }