foursolids

import java.util.Scanner;
public class foursolids {
    public static void main(String[] args){
        final double PI = 3.14159265;
        double radius;
        double height;
        double area;
        double volume;
        double slant;
        double radiusR;
        char selection;
        int totalcalc;
        int calc = 0;
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter 'a' do to cyclinder calculation, 'b' do to cone calculation, 'c' to do sphere calcalution, 'd' to do torus calculation, 'e' to exit the program :");
        selection = in.next().charAt(0);
        System.out.println();
        switch (selection) {
            case 'a':
                System.out.println("How many times do want to calculate? :");
                totalcalc = in.nextInt();
                System.out.println();
                while (calc<totalcalc) {
                    System.out.println("Cyclinder calculation");
                    System.out.println("Please enter radius :");
                    radius = in.nextDouble();
                    System.out.println("Please enter height :");
                    height = in.nextDouble();
                    area = 2 * PI * radius * (radius + height);
                    volume = PI * radius * radius * height;
                    area=Math.round(area*100.0)/100.0;
                    volume=Math.round(volume*100.0)/100.0;
                    System.out.println("Area for cyclinder is : " +area);
                    System.out.println("Volume for cyclinder is : " +volume);
                    System.out.println();
                    calc++;
                }
                break;
            case 'b':
                System.out.println("How many times do want to calculate? :");
                totalcalc = in.nextInt();
                System.out.println();
                while (calc<totalcalc) {
                    System.out.println("Cone calculation");
                    System.out.println("Please enter radius :");
                    radius = in.nextDouble();
                    System.out.println("Please enter height :");
                    height = in.nextDouble();
                    System.out.println("Please enter slant :");
                    slant = in.nextDouble();
                    area = PI * radius * (radius + slant);
                    volume = 1/3 * radius * radius * PI * height;
                    area=Math.round(area*100.0)/100.0;
                    volume=Math.round(volume*100.0)/100.0;
                    System.out.println("Area for cyclinder is : " +area);
                    System.out.println("Volume for cyclinder is : " +volume);
                    System.out.println();
                    calc++;
                }
                break;
            case 'c':
                System.out.println("How many times do want to calculate? :");
                totalcalc = in.nextInt();
                System.out.println();
                while (calc<totalcalc) {
                    System.out.println("Sphere calculation");
                    System.out.println("Please enter radius :");
                    radius = in.nextDouble();
                    area = 4 * PI * radius * radius;
                    volume = 4/3 * PI * radius * radius * radius;
                    area=Math.round(area*100.0)/100.0;
                    volume=Math.round(volume*100.0)/100.0;
                    System.out.println("Area for cyclinder is : " +area);
                    System.out.println("Volume for cyclinder is : " +volume);
                    System.out.println();
                    calc++;
                }
                break;
            case 'd':
                System.out.println("How many times do want to calculate? :");
                totalcalc = in.nextInt();
                System.out.println();
                while (calc<totalcalc) {
                    System.out.println("Torus calculation");
                    System.out.println("Please enter radius :");
                    radius = in.nextDouble();
                    System.out.println("Please enter radiusR :");
                    radiusR = in.nextDouble();
                    area = 4 * PI * PI * radiusR * radius;
                    volume = 2 * PI * PI * radiusR * radius * radius;
                    area=Math.round(area*100.0)/100.0;
                    volume=Math.round(volume*100.0)/100.0;
                    System.out.println("Area for cyclinder is : " +area);
                    System.out.println("Volume for cyclinder is : " +volume);
                    System.out.println();
                    calc++;
                }
                break;
            case 'e':
                System.out.println("You choose to exit the program");
                break;
            default:
                System.out.println("Error! Please enter between 'a' , 'b' , 'c' , 'd' , 'e' only");
                break;
        }
        }
    }