aType未命名类型

Question

我正在进行继承，但我遇到了这个奇怪的错误。我做错了什么？

我认为代码在我试图实现的目标上会非常直接。目标是创建多个子类，以识别不同类别的几个不同的奥运会参与者。因此，aType变量wille在每个不同的子类中都是常量。但我仍然希望能够使用baseclass中的printAttributes函数。

class olympicAttender{

public:
    string aName;
    int aAge;
    string aGender;
    string aType;

    void speak(){
        cout << aName <<" speaks!" << endl;
    }

    void printAttributes(){
    cout << "Name: " << aName << endl;
    cout << "Age: " << aAge << endl;
    cout << "Gender: " << aGender << endl;
    cout << "Type: " << aType << endl;
    cout << "----------------------------" << endl;
    }
};

class sprinter : public olympicAttender{

    public:
        aType = "Sprinter";
        void run(){
            cout << aName <<" runs!" << endl;
        }
};

int main(){

sprinter Sprinter1;
Sprinter1.aAge = 31;
Sprinter1.aGender = "Male";
Sprinter1.aName = "Usain Bolt";

Sprinter1.printAttributes();

}