ADD file via upload

src/Primaryproblem.java

@@ -0,0 +1,117 @@
+import java.util.Random;
+import java.util.Scanner;
+
+
+public class Primaryproblem implements Makeproblem {
+    private static Random random = new Random();
+    static int basic=1;
+    static int basic1=1;
+    String name="1";
+    String time="1";
+    int num=1;
+    public static void main(String[] args) {
+        Primaryproblem p1 = new Primaryproblem();
+        p1.name="张三1";
+        Timemanage t1=new Timemanage();
+        p1.time=t1.timeget();
+        for (int i = 0; i < 15; i++) {
+            basic=1;
+            basic1=1;
+            System.out.println((i + 1) + ". " + p1.generateSmartExpression());
+            p1.num++;
+        }
+    }
+    void start(int num,String username){
+        name=username;
+        Timemanage t1=new Timemanage();
+        time=t1.timeget();
+        for (int i = 0; i < num; i++) {
+            basic=1;
+            basic1=1;
+            System.out.println((i + 1) + ". " + generateSmartExpression());
+            System.out.println("");
+        }
+    }
+    @Override
+    public  String generateSmartExpression() {
+        int operatorCount = random.nextInt(3) + 1;
+        int b2=random.nextInt(operatorCount) + 1;
+        String file=time;
+        String result;
+        while(true){
+            int flag=0;
+            result=buildExpression(operatorCount,b2);
+            filemanage f1=new filemanage();
+            f1.fileread(name);
+            f1.fileread(name);
+            for(String i:f1.array){
+                String[] parts = i.split("\\.", 2);
+                String j = parts.length > 1 ? parts[1] : i;
+                if(result.equals(j)){
+                    flag=1;
+                }
+            }
+            if(flag==1){
+                continue;
+            }
+            f1.filecreate(name,file);
+            f1.filewrite(name,file,num+"."+result);
+            f1.filewrite(name,file," ");
+            num++;
+            break;
+        }
+        return result;
+    }
+    @Override
+    public  String buildExpression(int operatorCount,int b2) {
+        if (operatorCount == 1) {
+            return generateSimpleExpression(b2);
+        }
+
+        // 随机决定分割点来添加括号
+        int splitPoint = random.nextInt(operatorCount - 1) + 1;
+
+        String leftPart = (splitPoint > 1 && random.nextBoolean()) ?
+                "(" + buildExpression(splitPoint,b2) + ")" :
+                buildExpression(splitPoint,b2);
+
+        String rightPart = (operatorCount - splitPoint > 1 && random.nextBoolean()) ?
+                "(" + buildExpression(operatorCount - splitPoint,b2) + ")" :
+                buildExpression(operatorCount - splitPoint,b2);
+
+        char operator = getRandomOperator("+-*/");
+        return leftPart + " " + operator + " " + rightPart;
+    }
+    @Override
+    public  String generateSimpleExpression(int b2) {
+        int a = random.nextInt(100) + 1;
+        int b = random.nextInt(100) + 1;
+        char op = getRandomOperator("+-*/");
+        if(basic1==3){
+            return a+"";
+        }
+        if(basic==b2){
+            op = getRandomOperator("+-*/");
+            basic1++;
+            return a + " " + op + " " + b;
+        }else {
+            basic++;
+        }
+        if(random.nextInt(2)==0){
+            return a+"";
+        }
+        if(random.nextBoolean()){
+            basic1++;
+            return a + " " + op + " " + b;
+        }else
+        {
+            basic1++;
+            return "("+a + " " + op + " " + b+")";
+        }
+
+    }
+    @Override
+    public  char getRandomOperator(String operators) {
+        return operators.charAt(random.nextInt(operators.length()));
+    }
+}