小学生算术题

public class WelcomeInMessageDialogBox {

public static void main(String[] args) {

　　//提问的个数
　　final int NUMBER_OF_QUESRIONS = 5;

　　//正确的个数
　　int correctCount = 0;

　　//总的答题个数
　　int count = 0;

　　//开始时间
　　long startTime = System.currentTimeMillis();
　　String output = "";
　　Scanner input = new Scanner(System.in);

while(count < NUMBER_OF_QUESRIONS){
　　int number1 = (int)(Math.random() * 10);
　　int number2 = (int)(Math.random() * 10);
　　

　　//确保number1 大于 number2
　　if(number1 < number2){
　　　　int temp = number1 ;
　　　　number1 = number2;
　　　　number2 = temp;
　　}

　　System.out.print("What is " + number1 + " - " + number2 + "? ");
　　int answer = input.nextInt();

　　//评判输入的结果是否正确
　　if(number1 - number2 == answer){
　　　　System.out.println("you are correct!");
　　　　correctCount ++;
　　　　count++;
　　　　output += "\n" + number1 + " - " + number2 + " = " + answer + " " + ((number1 - number2 == answer)? "correct" : "wrong");
　　}else{
　　　　System.out.println("Your answer is wrong. " + number1 + " - " + number2 + " should be " + (number1 - number2));
　　　　count++;
　　　　output += "\n" + number1 + " - " + number2 + " = " + answer + " " + ((number1 - number2 == answer)? "correct" : "wrong");
　　　　}
　　}

　　//结束时间
　　long endTime = System.currentTimeMillis();

　　//计算花费的时间
　　long testTime = endTime - startTime;

　　System.out.println("Correct count is " + correctCount + "\nTest time is " + testTime / 1000 + "second\n" + output);
　　}
}