日常Java 2021/9/26 （二柱升级版）

package m;

import java.util.Scanner;
import java.util.Random;

public class di_er {
static int number=1000,i=0;
static int []a1=new int[number];
static int []a2=new int[number];
static double []sum=new double[number];//存储小数

static int []s=new int[number];//错题序号
static int []operator=new int[number]; //运算符

static int questionNumber=0;//题目个数
static int operatorNumber=0;//操作数个数
static int min=0;//最小值
static int max=0;//最大值
static int right=0;//正确题目
static int wrong=0;//错误题目
static Scanner in=new Scanner(System.in);

/*判断是否重复*/
public static boolean judge(int i) {
boolean y=false;
if(i!=0) {
int k=i;
for(int j=i;j>=0;j--) {
if(a1[k]==a1[j]&&a2[k]==a2[j])
y=true;
else
y=false;
}
}
return y;
}

/*生成一个随机数*/
public static void birth() {
a1[i]=min+(int)(Math.random()*((max-min)+1));
a2[i]=min+(int)(Math.random()*((max-min)+1));

}

/*出题*/
public static void setQuestion() {
System.out.println("请输入题目的个数：");
questionNumber=in.nextInt();
System.out.println("请输入操作数的个数：");
operatorNumber=in.nextInt();
System.out.println("请输入操作数取值范围的最小值：");
min=in.nextInt();
System.out.println("请输入操作数取值范围的最大值：");
max=in.nextInt();
}

/*回答问题*/
public static void replyQuestion() {

System.out.println("请同学现在进行答题！(除法请保留3位小数)");

for(int i=0;i<questionNumber;i++) {
sum[i]=in.nextDouble();
}

System.out.println("*************答题结束！*************");

}

/*判断结果是否正确*/
public static void judgeRightOrWrong() {
int r=0,w=0;
for(int i=0;i<questionNumber;i++) {
switch(operator[i]) {
case 0:{
if((a1[i]+a2[i]-sum[i])<1e-3)
r++;
else {
s[w]=i;
w++;
}
right=r;
wrong=w;
break;
}
case 1:{
if((a1[i]-a2[i]-sum[i])<1e-3)
r++;
else {
w++;
s[w]=i;
}
right=r;
wrong=w;
break;
}
case 2:{
if((a1[i]*a2[i]-sum[i])<1e-3)
r++;
else {
w++;
s[w]=i;
}
right=r;
wrong=w;
break;
}
case 3:{
if(((double)a1[i]/a2[i]-sum[i])<1e-3)
r++;
else {
w++;
s[w]=i;
}
right=r;
wrong=w;
break;
}

}
right=r;
wrong=w;
}
}

/*错题集*/
public static void wrongQuestion() {

System.out.println("错题集：");

String M="1";
for(int i=0;i<wrong;i++) {
int j=s[i];
if(operator[j]==0)
M="+";
if(operator[j]==1)
M="-";
if(operator[j]==2)
M="*";
if(operator[j]==3)
M="/";
System.out.println(a1[j]+M+a2[j]+"="+sum[j]);
}
}

/*主函数*/
public static void main(String []args) {

boolean flag=true;
int s1;
String m="s";
setQuestion();

for(i=0;i<questionNumber;i++) {
birth();
s1=(int)(Math.random()*4);
flag=judge(i);
if(flag) {
birth();
}
if(s1==0) {
m="+";
operator[i]=0;
}
if(s1==1) {
m="-";
operator[i]=1;
}
if(s1==2) {
if(a1[i]*a2[i]<100) {
m="*";
operator[i]=2;
}
else {
m="*";
birth();
}
}
if(s1==3) {
m="/";
operator[i]=3;
}
System.out.println(a1[i]+m+a2[i]+"=");
}

replyQuestion();
judgeRightOrWrong();
System.out.println("正确个数："+right);
System.out.println("错误个数："+wrong);
System.out.println("正确率："+((double)right/questionNumber)*100+"%");
System.out.println("错误率："+((double)wrong/questionNumber)*100+"%");
wrongQuestion();

System.out.println("选择yes/no对错题是否进行重做？");
String str=in.next();
String str1="yes";
String str2="no";
if(str.equals(str1)) {

while(wrong!=0) {
String M="1";
for(int i=0;i<wrong;i++) {
int j=s[i];
if(operator[j]==0)
M="+";
if(operator[j]==1)
M="-";
if(operator[j]==2)
M="*";
if(operator[j]==3)
M="/";
System.out.println(a1[j]+M+a2[j]+"=");
System.out.println("请重做：");
sum[j]=in.nextDouble();
}
judgeRightOrWrong();
}
if(wrong==0)
System.out.println("全部正确，答题结束");
}

if(str.equals(str2)) {
System.out.println("答题结束");
System.exit(0);
}

}

}

程序判断除法不是很准确