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c++中string应该怎样用,应输入标识符是什么意思 C++问题

#include #include<string.h> using namespace std;

class process { public: virtual void print() = 0; }; class person :public process { private: string name; string gender; int age;

person(string n, string g, int a)
{
    name = n;
    gender = g;
    age = a;
}
virtual void print()
{
    cout << "姓名:" << name << "性别:" << gender << "年龄:" << age << endl;
}

}; class student :public person { public:

int id;
int score1;
int score2;
int score3;

person(int i, int s1, int s2, int s3)
{
    id = i;
    score1 = s1;
    score2 = s2;
    score3 = s3;
}

virtual void print()
{
    cout << "学号:" << id << "语文成绩:" << score1 << "数学成绩:" << score2 << "英语成绩:" << score3 << endl;
}

}; int main() { person p("张三", "男", 20); student s(19060102, 100, 99, 98); process* pro1 = new person; pro1->print(); process* pro2 = new student; pro2->print(); system("pause"); return 0;

}

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DM。 2020-05-27 10:02:05 1388 0
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  • class person(string n = 0,string g = 0,int a = 0) : 构造函数不能写在类定义上

    #include<iostream>
    #include<string>
    using namespace std;
    
    class process
    {
    public:
        virtual void print() = 0;
    };
    class person: public process
    {
    private:
        string name;
        string gender;
        int age;
    public:
        person(string n = "默认名",string g = "男",int a = 0) 
        {
            name = n;
            gender = g;
            age = a;
        }
        virtual void print()
        {
            cout << "姓名:" << name << "性别:" << gender << "年龄:" << age << endl;
        }
    };
    class student :public person
    {
    private:
    
        int id;
        int score1;
        int score2;
        int score3;
    public:
        student(int i, int s1, int s2, int s3):person()
        {
            id = i;
            score1 = s1;
            score2 = s2;
            score3 = s3;
        }
    
        virtual void print()
        {
            cout << "学号:" << id << "语文成绩:" << score1 << "数学成绩:" << score2 << "英语成绩:" << score3 << endl;
        }
    
    };
    int main()
    {
        person p("张三", "男", 20);
        student s(19060102, 100, 99, 98);
        process* pro1 = new person("张四", "男", 21);
        pro1->print();
        process* pro2 = new student(19060103, 95, 80, 70);
        pro2->print();
    
    }
    
    

    姓名:张四性别:男年龄:21 学号:19060103语文成绩:95数学成绩:80英语成绩:70

    2020-05-27 10:56:48
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