c ++ / clrIntelliSense：没有运算符＆＃34; +＆＃34;匹配这些操作数。 System :: Double ^ + System :: Double ^

Question

String ^ name;
Double^ math;
Double ^ physics;
Double ^ english;
Double ^ chemistry;
Double ^ cs;
Double ^ avrg;
Double ^ grade;  

name = this->name->Text;
math = Convert::ToDouble(this->textmath->Text);
physics = Convert::ToDouble(this->phis->Text);
english = Convert::ToDouble(this->eng->Text);
chemistry = Convert::ToDouble(this->chem->Text);
cs = Convert::ToDouble(this->cstf->Text);

Double^ sum = (math + physics + english + chemistry + cs) / 5;

在Double ^ sum的最后一次操作中出现错误：
               1智能感知：无操作员＆＃34; +＆＃34;匹配这些操作数                  操作数类型是：System :: Double ^ + System :: Double ^ 你能帮我找个答案吗？谢谢！

Answer 1

不要使用物品！

String ^ name = this->name->Text;
Double math = Convert::ToDouble(this->textmath->Text);
Double physics = Convert::ToDouble(this->phis->Text);
Double english = Convert::ToDouble(this->eng->Text);
Double chemistry = Convert::ToDouble(this->chem->Text);
Double cs = Convert::ToDouble(this->cstf->Text);

Double sum = (math + physics + english + chemistry + cs) / 5.0;