public class IMC{
public static void main(String[] args){

 Scanner sauron = new Scanner(System.in);
 System.out.println("whats your tweight");
 int age = sauron.nextInt();
 Planeta mars = new Planeta(); //create object Planeta
 mars.nome = "Mars";
 mars.grav = 0.38;
 double marte = mars.peso(age,0.38);
 System.out.println("I have information about the following planets");
 System.out.println("1. Venus \t 2.Mars \t 3.Jupiter");
 System.out.println("4. Saturn \t 5.Uranus \t 6.Neptune");
 System.out.println("Wich planet are you visiting?");
 Scanner answer = new Scanner(System.in);
 int num = answer.nextInt();


//this is were im lost, no idea of how should i get the info from the user and then display the info of the
//specific planet
 if(num == 2)
 {
 System.out.println(marte);
 }


 }


public class Planeta{
String nome;
double grav;

public double peso(int peso, double grav)
{
this.grav = grav;
return peso * grav;
}
}