定义对象为什么这里名字报错，想不明白

Question

#if 1
#include<iostream>
#include<string>
using namespace std;

class student
{
public:
    
    student(string name, int ID, char sex, int age)
    {
        this->name = name;
        this->ID = ID;
        this->sex = sex;
        this->age = age;    
    }
    ~student(){}

    void showinfo()
    {
        cout << "姓名：" << name << endl;
        cout << "学号：" << ID << endl;
        cout << "性别：" << sex << endl;
        cout << "年龄：" << age << endl;
    }
private:
    string name;
    int ID;
    char sex;
    int age;

};

class hightschool :public student
{
public:
    hightschool(string name,int ID,char sex,int age,string major):student(name,ID,sex,age)
    {
        this->major = major;
    }

    void schoolmoney()
    {
        cout << "获得奖学金" << endl;
    }


private:
    string major;
};

class graduate:public student
{
public:
    graduate(string name, int ID, char sex, int age, string teachername, string major1) :student(name, ID, sex, age)
    {
        this->teachername = teachername;
        this->major1 = major1;
    }
    
    void gongzi()
    {
        cout << "发放工资函数" << endl;
    }

private:
    string teachername;
    string major1;

};


int main()
{
    student d1("aaa",001,"x",15);//这里的"aaa”报错，说是类型不符
}
#endif

Answer 1