public class MathAccumulateRandom {
public static void main(String[] args) {
int index1=0;
int index2=0;
int score=0;
Random rand=new Random();
System.out.println("请开始答题,答对一题得10分,答错一题不得分,若输入-1,则退出程序");
for (int i = 1; i <=10; i++) {
int num=rand.nextInt(4)+1;
Scanner scan=new Scanner(System.in);
int a=rand.nextInt(101);
int b=rand.nextInt(101);
int plus=a+b;
int multiply=a*b;
switch (num) {
case 1:
System.out.println(a+"+"+b+"=?");
System.out.println("请输入你的答案");
int m=scan.nextInt();
if (m==plus) {
index1++;
score+=10;
System.out.println("恭喜你,你输入了正确答案:"+plus+",已经答对"+index1+"次,得分为"+score+"分");
}else if (m==-1) {
System.out.println("你输入了-1,退出程序");
// return; //return是回到上一层,而system.exit(status)是回到最上层
System.exit(0);//方法里面为0,表示程序正常退出,如果为非0参数,表示非正常退出
}else {
index2++;
System.out.println("很遗憾,正确答案为:"+plus+",你已经答错了"+index2+"次,本次不得分");
}
break;
case 2:
int c=rand.nextInt(101);
int d=rand.nextInt(c);
int subtract=c-d;
System.out.println(c+"-"+d+"=?");
System.out.println("请输入你的答案");
int n=scan.nextInt();
if (n==subtract) {
index1++;
score+=10;
System.out.println("恭喜你,你输入了正确答案:"+subtract+",已经答对"+index1+"次,得分为"+score+"分");
}else if (n==-1) {
System.out.println("你输入了-1,退出程序");
System.exit(0);
}else {
index2++;
System.out.println("很遗憾,正确答案为:"+subtract+",你已经答错了"+index2+"次,本次不得分");
}
break;
case 3:
System.out.println(a+"*"+b+"=?");
System.out.println("请输入你的答案");
int o=scan.nextInt();
if (o==multiply) {
index2++;
score+=10;
System.out.println("恭喜你,你输入了正确答案:"+multiply+",已经答对"+index1+"次,得分为"+score+"分");
}else if (o==-1) {
System.out.println("你输入了-1,退出程序");
System.exit(0);
}else {
index2++;
System.out.println("很遗憾,正确答案为:"+multiply+",你已经答错了"+index2+"次,本次不得分");
}
break;
case 4:
double e=rand.nextDouble()*100+1;
double f=rand.nextDouble()*100+1;
DecimalFormat df=new DecimalFormat("#.00");
String e1=df.format(e);
String f1=df.format(f);
e=Double.parseDouble(e1);
f=Double.parseDouble(f1);
String divi=df.format(e/f);
double divide=Double.parseDouble(divi);
System.out.println(e+"/"+f+"=?");
System.out.println("请输入你的答案");
double p=scan.nextDouble();
if (p==divide) {
index1++;
score+=10;
System.out.println("恭喜你,你输入了正确答案:"+divide+",已经答对"+index1+"次,得分为"+score+"分");
}else if (p==-1) {
System.out.println("你输入了-1,退出程序");
System.exit(0);
}else {
index2++;
System.out.println("很遗憾,正确答案为:"+divide+",你已经答错了"+index2+"次,本次不得分");
}
break;
default:
break;
}
}
System.out.println("本次测试共10题,你共答对了"+index1+"次,答错了"+index2+"次,共得分"+score+"分");
}
}
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转载自blog.csdn.net/u011174699/article/details/82812096
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