Java实现随机出题，10道10以内加减法计算

package com.swift;

import java.awt.Toolkit;
import java.util.Scanner;

public class PlusQuiz {

public static void main(String[] args) {
int i=0;
int number1=0,number2=0;
for(;;) {
number1=(int) (Math.random()*10);
number2=(int) (Math.random()*10);
//加法部分
System.out.println("What is "+number1+"+"+number2+"?");
Scanner scan=new Scanner(System.in);
int answer=scan.nextInt();
if(answer==number1+number2) {
System.out.println("√");
Toolkit.getDefaultToolkit().beep();
//System.out.println('\007');

}else {
System.out.println("×");
System.out.println(number1+"+"+number2+" should be "+(number1+number2));
}
//减法部分
if(number1<number2) {
int temp;
temp=number1;
number1=number2;
number2=temp;
}
System.out.println("What is "+number1+"-"+number2+"?");
int answer2=scan.nextInt();
if(answer2==number1-number2) {
System.out.println("√");
for(int
4000
time=0;time<6;time++)
Toolkit.getDefaultToolkit().beep();
}else {
System.out.println("×");
System.out.println(number1+"-"+number2+" should be "+(number1-number2));
}
//判断加减法完成次数
i++;
if(i==5) {
break;
}
}
}

}