Java Programs - Solved 2007 ICSE Computer Science Paper

import java.io.*;
class Conversion{
    public static void main(String args[])throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("1. Fahrenheit to Celsius");
        System.out.println("2. Celsius to Fahrenheit");
        System.out.print("Enter your choice: ");
        int choice = Integer.parseInt(br.readLine());
        switch(choice){
            case 1:
              System.out.print("Temperature in Fahrenheit: ");
              double f = Double.parseDouble(br.readLine());
              double c = 5.0 / 9 * (f - 32);
              System.out.println("Temperature in Celsius: " + c);
              break;
            case 2:
              System.out.print("Temperature in Celsius: ");
              c = Double.parseDouble(br.readLine());
              f = 1.8 * c + 32;
              System.out.println("Temperature in Fahrenheit: " + f);
              break;
            default:
              System.out.println("Invalid choice!");
        }
    }
}