area-of-triangles-switch-case

import java.util.*;
class namokar
{
public static void main()
    {
        Scanner sc = new Scanner(System.in);
        int n, a ,  b , c ;
        System.out.println("1; Scalene ");
        System.out.println("2; equilateral");
        System.out.println("3; isoceles");
        System.out.println("choose from 1 2 3");
        n = sc.nextInt();
        
        switch(n)
        {
            case 1:
                System.out.println("enter 3 sides");
                a = sc.nextInt();
                b = sc.nextInt();
                c = sc.nextInt();
                double s= (a+b+c)/2;
                double area = Math.sqrt(s*(s-a)*(s-b)*(s-c));
                System.out.println("area="+area);
                break;
                
            case 2:
                System.out.println("enter side");
                int o = sc.nextInt();
                double a1 = (Math.sqrt(3)*(o*o))/4;
                System.out.println("area"+a1);
                break;
                
            case 3:
                System.out.println("Enter 2 side");
                int q = sc.nextInt();
                int w = sc.nextInt();
                double a2 = (1/4)*q*Math.sqrt((4*(w*w))-(q*q));
                System.out.println("area"+a2);
                break;
            default:
                System.out.println("wrong");
        }
}
}