Repl.java

import java.util.Scanner;

public class Repl {
 public static void main(String[] args) throws Exception {
 Interpreter i = new Interpreter();

 Scanner sc = new Scanner(System.in);

 for (;;) {
 try {
 System.out.print("> ");
 String expr = sc.nextLine();
 i.execute(expr);
 } catch (java.util.NoSuchElementException e) {
 sc.close();
 break;
 } catch (Exception e) {
 System.out.println(e.getMessage());
 }
 }
 }
}