ADD file via upload

src/question_product.cpp

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+#include"question_product.h"
+#include<cstdlib>
+#include<ctime>
+
+int QuestionProduction::randnum(int min,int max){
+  int num = (rand()%(max - min + 1)) + min;
+  return num;
+}
+
+Question QuestionProduction::questionProduction(int questionId,const std::string& usertype){
+    int operationnum = randnum(1,5);
+    std::vector<int> operations;
+
+    for(int i = 0;i < operationnum;i++){
+        operations.push_back(randnum(1,100));
+    }
+
+    if(usertype == "Сѧ"){
+        return primaryProduction(questionId,operations);
+    }else if(usertype == "³õÖÐ"){
+        return juniorProduction(questionId,operations);
+    }else if(usertype == "¸ßÖÐ"){
+        return seniorProduction(questionId,operations);
+    }
+}
+
+
+Question QuestionProduction::primaryProduction(int questionId,const std::vector<int>&operation){
+  if(operation.size() == 1){
+    std::string expression = std::to_string(operation[0]);
+    return Question(questionId,expression);
+  }
+
+  std::string expression = std::to_string(operation[0]);
+
+  for(int i = 1;i < operation.size();i++){
+    std::string op = primaryWay[randnum(0,primaryWay.size() - 1)];
+    bool ifbracket = randnum(0,1);
+    if(ifbracket){
+      expression = "(" + expression + " " + op + " " + std::to_string(operation[i]) + ")";
+    }else{
+      expression = expression + " " + op + " " + std::to_string(operation[i]);
+    }
+    }
+
+  return Question(questionId,expression);
+}
+
+Question QuestionProduction::juniorProduction(int questionId,const std::vector<int>&operation){
+  std::string expression = std::to_string(operation[0]);
+  bool ifSpecialop = false;
+  
+  for(int i = 1;i < operation.size();i++){
+    if(randnum(0,1) == 1){
+        if(randnum(0,1) == 1){
+            expression = "¡Ì" + expression;
+        }else{
+            expression = "(" + expression + ")?";
+        }
+        ifSpecialop = true;
+    }
+    std::string op = primaryWay[randnum(0,primaryWay.size() - 1)];
+    bool ifbracket = randnum(0,1);
+    if(ifbracket){
+      expression = "(" + expression + " " + op + " " + std::to_string(operation[i]) + ")";
+    }else{
+      expression = expression + " " + op + " " + std::to_string(operation[i]);
+    }
+  }
+
+  if(!ifSpecialop){
+    if(randnum(0,1) == 1){
+            expression = "¡Ì" + expression;
+        }else{
+            expression = "(" + expression + ")?";
+        }
+  }
+
+  return Question(questionId,expression);
+}
+
+Question QuestionProduction::seniorProduction(int questionId,const std::vector<int>&operation){
+  std::string expression = std::to_string(operation[0]);
+  bool ifTrigonometric = false;
+
+  for(int i = 1;i < operation.size();i++){
+    if(randnum(0,1)){
+      std::vector<std::string>trigFuns = {"sin","cos","tan"};
+      std::string trigFun = trigFuns[randnum(0,2)];
+      expression = trigFun + "(" + expression + ")";
+      ifTrigonometric = true;
+    }else if(randnum(0,2) == 0){
+        if(randnum(0,1) == 1){
+            expression = "¡Ì" + expression;
+        }else{
+            expression = "(" + expression + ")?";
+        }
+    }
+    std::string op = primaryWay[randnum(0,primaryWay.size() - 1)];
+    bool ifbracket = randnum(0,1);
+    if(ifbracket){
+      expression = "(" + expression + " " + op + " " + std::to_string(operation[i]) + ")";
+    }else{
+      expression = expression + " " + op + " " + std::to_string(operation[i]);
+    }
+  }
+
+  if(!ifTrigonometric){
+    std::vector<std::string>trigFuns = {"sin","cos","tan"};
+    std::string trigFun = trigFuns[randnum(0,2)];
+    expression = trigFun + "(" + expression + ")";
+  }
+
+  return Question(questionId,expression);
+}