10.24每日总结

在课上练习的基础上，实现输出加减法混合的运算题目列表。

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package JavaTest;
 
import java.util.*;
import javax.script.*;
 
public class test1 {
 
   static char[] fu = {'+', '-', '*', '/'};  // 符号
   static String[] ti = new String[100];  // 题
   static String[] daan = new String[100];  // 答案
   static int tishu = 10;  // 题数
   static int caozuoshu = 2;  // 操作数
   static int fanwei = 100;  // 范围
 
   public static void choose() {
       Scanner s = new Scanner(System.in);
 
       System.out.println("**********************");
       System.out.println("*  口算题生成与答题   *");
       System.out.println("**********************");
 
       System.out.println("请选择操作：");
       System.out.println("1. 参数设置");
       System.out.println("2. 开始出题并答题");
       System.out.println("0. 退出");
 
       int x = s.nextInt();
       while (x != 0) {
           switch (x) {
               case 1:
                   canshu();
                   break;
               case 2:
                   chuti(tishu, caozuoshu, fanwei);
                   suandaan();
                   zuoti();
                   break;
               default:
                   System.out.println("请输入 1-2 或 0 退出");
                   break;
           }
           System.out.println("**********************");
           System.out.println("*  口算题生成与答题   *");
           System.out.println("**********************");
 
           System.out.println("请选择操作：");
           System.out.println("1. 参数设置");
           System.out.println("2. 开始出题并答题");
           System.out.println("0. 退出");
 
           x = s.nextInt();
       }
   }
 
   // 参数设置
   public static void canshu() {
       Scanner c = new Scanner(System.in);
       System.out.println("**********************");
       System.out.println("*      参数设置      *");
       System.out.println("**********************");
 
       System.out.print("请输入题数：");
       tishu = c.nextInt();
 
       System.out.print("请输入操作数：");
       caozuoshu = c.nextInt();
 
       System.out.print("请输入范围：");
       fanwei = c.nextInt();
       System.out.println("参数设置完成");
   }
 
   // 出题
   public static void chuti(int tishu, int caozuoshu, int fanwei) {
       int a = 0;
       int c = 0;
       int d = 0;
       int e = 0;
       Random r = new Random();
       for (int i = 0; i < tishu; i++) {
           StringBuilder b = new StringBuilder();
           if (caozuoshu == 2) {
               d = r.nextInt(4);
               if (d == 3) {
                   while (true) {
                       e = r.nextInt(fanwei + 1);
                       c = r.nextInt(fanwei + 1);
                       a = c * e;
                       if (a <= fanwei && c != 0)
                           break;
                   }
               } else {
                   a = r.nextInt(fanwei + 1);
                   d = r.nextInt(3);
                   c = r.nextInt(fanwei + 1);
               }
               b.append(a);
               b.append(' ').append(fu[d]).append(' ');
               b.append(c);
           } else {
               for (int j = 1; j <= 2 * caozuoshu - 1; j += 2) {
                   a = r.nextInt(fanwei + 1);
                   b.append(a);
                   if (j != 2 * caozuoshu - 1) {
                       b.append(' ').append(fu[r.nextInt(3)]).append(' ');
                   }
               }
           }
 
           ti[i] = b.toString();
       }
   }
 
   // 查重
   public static boolean same() {
       for (int i = 0; i < tishu; i++) {
           for (int j = i + 1; j < tishu; j++) {
               if (ti[i].equals(ti[j])) {
                   return true;
               }
           }
       }
       return false;
   }
 
   // 算答案
   public static void suandaan() {
       ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
       ScriptEngine scriptEngine = scriptEngineManager.getEngineByName("nashorn");
 
       for (int i = 0; i < tishu; i++) {
           try {
               String result = String.valueOf(scriptEngine.eval(ti[i]));
               daan[i] = result;
           } catch (ScriptException e) {
               e.printStackTrace();
           }
       }
   }
 
   // 做题
   public static void zuoti() {
       Scanner indaan = new Scanner(System.in);
       String an = "";
 
       System.out.println("**********************");
       System.out.println("*       开始答题       *");
       System.out.println("**********************");
 
       int count = 0;
       for (int i = 0; i < tishu; i++) {
           if (!same()) {
               count++;
               System.out.print(count + ".\t" + ti[i] + " = ");
               an = indaan.next();
               if (an.equals(daan[i])) {
                   System.out.println("√");
               } else {
                   System.out.println("×");
               }
           } else {
               i--;
           }
       }
       System.out.println("**********************");
       System.out.println("*       答题完成       *");
       System.out.println("**********************");
 
       System.out.println("正确率：" + (double) (tishu - count) * 100 / tishu + "%");
   }
 
   public static void main(String[] args) {
       choose();
   }
}