/**  * Simple mathematics quiz * @author: Jeremy Rayner * based on algorithms from INPUT/Marshall Cavendish/1984 */while (true) {    try {        def n = (int)(Math.random() * 12) + 1        println "What is $n times 9?"        def a = System.in.readLine().toInteger()        if (a == n * 9) println "Correct"                  } catch (Exception e) {        println "The computer didn't understand your input"    }}