1

data.h

@@ -222,7 +222,7 @@ void DoSortBook()
         for (int j=books.length;j>0;j--)
         {
             if (books.elem[i].id>books.elem[j].id) {
-                auto temp=books.elem[i];books.elem[i]=books.elem[j];books.elem[j]=temp;}
+                Book temp=books.elem[i];books.elem[i]=books.elem[j];books.elem[j]=temp;}
         }
     }
     cout << "*****************************" <<endl;