ADD file via upload

src/question_product.h

@@ -0,0 +1,23 @@
+#ifndef QUESTION_PRODUCT_H
+#define QUESTION_PRODUCT_H
+
+#include"case.h"
+#include<vector>
+#include<string>
+
+class QuestionProduction{
+  private:
+    std::vector<std::string>primaryWay = {"+","-","*","/"};
+    std::vector<std::string>juniorWay = {"+","-","*","/","²","√"};
+    std::vector<std::string>seniorWay = {"+","-","*","/","²","√","sin","cos","tan"};
+
+    Question primaryProduction(int questionId,const std::vector<int>&operation);
+    Question juniorProduction(int questionId,const std::vector<int>&operation);
+    Question seniorProduction(int questionId,const std::vector<int>&operation);
+  public:
+    Question questionProduction(int questionId,const std::string& usertype);
+    int randnum(int min,int max);
+};
+
+
+#endif