标签：ring main += while == oid int next NPU
/*
每次产生5个随机减法算术题，提示用户输入答案，
并判断是否正确，最后显示正确答案以及答题时间
涉及知识点：
1.随机数的生成方法Math.random()
2.条件分支语句if
3.获取时间System.currentTimeMillis(),
4.三元运算符代替if
5.String 的巧妙使用
*/
package Example;
import java.util.Scanner;
public class Minus {
public static void main(String[] args) {
// TODO Auto-generated method stub
final int numberofquestions = 5;//题目数量
int corrrectcount = 0; //答对数量
int count = 0; //答题计数器
long stsrttime = System.currentTimeMillis(); //获取时间
String output = "";
Scanner input = new Scanner(System.in); //创建输入
while (count<numberofquestions)
{
int num1 = (int)(Math.random()*10);//产生随机数
int num2 = (int)(Math.random()*10);
if (num1<num2) //使num1>=num2
{
int temp = num1;
num1 = num2;
num2 = temp;
}
System.out.println("What is "+num1+" - "+num2+"?\n");//输出问题
int answer = input.nextInt(); //输入
if (num1-num2 == answer)
{
System.out.print("You are corrrect!\n");
corrrectcount++;
}
else
System.out.print("You are wrong!\nThe correct answer should be "
+(num1-num2)+"\n");
count++;
//String 的巧妙使用,三元运算符代替if
output += "\n"+num1+" - "+num2+ " = " + answer + ((num1-num2==answer)?
" correct":" wrong");
}
long endtime = System.currentTimeMillis(); //获取时间
long lasttime = endtime -stsrttime;
System.out.println("Correctnumber is "+corrrectcount+"\n"
+"Test time is "+lasttime/1000 + " seconds\n" + output);
}
}
/*
运行结果：
What is 7 - 1?
5
You are wrong!
The correct answer should be 6
What is 4 - 2?
5
You are wrong!
The correct answer should be 2
What is 2 - 0?
5
You are wrong!
The correct answer should be 2
What is 2 - 1?
55
You are wrong!
The correct answer should be 1
What is 8 - 0?
5
You are wrong!
The correct answer should be 8
Correctnumber is 0
Test time is 14 seconds
7 - 1 = 5 wrong
4 - 2 = 5 wrong
2 - 0 = 5 wrong
2 - 1 = 55 wrong
8 - 0 = 5 wrong
*/
标签：ring main += while == oid int next NPU
原文地址：https://www.cnblogs.com/Alic5/p/14443326.html
