修改Equation，将生成题目字符串答案替换为“？”，删除计算答案部分

data/张三1/2025-09-24-22-19-25.txt

@@ -1,19 +0,0 @@
-1. 55 + 80 - 9 * 89 = 11214
-
-2. 22 + 60 = 82
-
-3. 35 / 5 * 56 / 8 = 49
-
-4. 69 * 60 / 24 / 8 = 21
-
-5. 99 + 80 - 96 - 64 = 19
-
-6. 23 - 2 = 21
-
-7. 92 + 45 = 137
-
-8. 17 * 100 * 97 - 83 = 164817
-
-9. 10 / 3 / 3 * 62 = 62
-
-10. 24 / 6 + 41 - 50 / 10 = 0

src/AbstractProblemGenerator.java

@@ -26,11 +26,6 @@ public abstract class AbstractProblemGenerator implements IProblemGenerator {
     while (newProblems.size() < count) {
       Equation candidate = createProblem();
 
-      // 检查最终结果是否为负数，如果是则舍弃（小学和初中常见要求）
-      if (candidate.getResult() < 0) {
-        continue;
-      }
-
       String canonicalForm = candidate.toCanonicalString();
 
       // 执行唯一性检查：既不能与历史重复，也不能与本次生成的其他题目重复

src/Application.java

@@ -98,7 +98,7 @@ public class Application {
         handleGenerateProblems(count);
       } else {
         throw new InvalidInputException(
-                String.format("无效输入。请输入 %d-%d 之间的数字、'切换为XX' 或 '-1'。",
+                String.format("请输入小学、初中和高中三个选项中的一个",
                         MIN_GENERATE_COUNT, MAX_GENERATE_COUNT));
       }
     } catch (InvalidInputException | IOException | NumberFormatException e) {

src/Equation.java

@@ -12,19 +12,16 @@ public class Equation {
 
   private final List<String> operands; // 使用String以支持如 "sqrt(16)" 的形式
   private final List<Operator> operators;
-  private final int result;
 
   public Equation(List<String> operands, List<Operator> operators) {
     this.operands = new ArrayList<>(operands);
     this.operators = new ArrayList<>(operators);
-    this.result = calculate();
   }
 
   // 为了方便，提供一个只接受整数操作数的构造函数
   public Equation(List<Integer> intOperands, List<Operator> operators, boolean isSimple) {
     this.operands = intOperands.stream().map(String::valueOf).collect(Collectors.toList());
     this.operators = new ArrayList<>(operators);
-    this.result = calculate();
   }
 
   public List<String> getOperands() {
@@ -35,9 +32,6 @@ public class Equation {
     return Collections.unmodifiableList(operators);
   }
 
-  public int getResult() {
-    return result;
-  }
 
   /**
    * 计算方程式的结果。
@@ -75,7 +69,7 @@ public class Equation {
       sb.append(" ").append(operators.get(i).getSymbol()).append(" ");
       sb.append(operands.get(i + 1));
     }
-    sb.append(" = ").append(result);
+    sb.append(" = ").append("?");
     return sb.toString();
   }