#include<iostream> #include<string.h> using namespace std; class stu{ private: string name; int num; int cla; public: stu(){} stu(string a,int b,int c){ name=a; num=b; cla=c; } void show1(){ cout<<num<<"->"<<name<<"->"<<cla<<endl; } }; class student:public stu{ private: string school; string teacher; string major; public: student(){} student(string d,string e,string f);stu(name,num,cla){ school=d; teacher=e; major=f; } void show2(){ cout<<school<<"->"<<teacher<<"->"<<major<<endl; } }; int main(){ string name,school,teacher,major; int num,cla; cin>>name>>num>>cla>>school>>teacher>>major; stu x1(name,num,cla); x1.show1(); student x2(school,teacher,major); x2.show2(); return 0; }

这段代码存在一些错误：

1. `student(string d,string e,string f);stu(name,num,cla)` 这一行应该改为 `student(string d,string e,string f,string a,int b,int c):stu(a,b,c)`，这里需要在构造函数中调用基类（即`stu`类）的构造函数来初始化基类的成员变量。

2. 在 `main` 函数中创建 `student` 对象时只传入了三个参数，而 `student` 类需要传入 6 个参数，应该改为 `student x2(school,teacher,major,name,num,cla);`。

修改后的代码如下：

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

class stu{
private:
    string name;
    int num;
    int cla;
public:
    stu(){}
    stu(string a,int b,int c){
        name=a;
        num=b;
        cla=c;
    }
    void show1(){
        cout<<num<<"->"<<name<<"->"<<cla<<endl;
    }
};

class student:public stu{
private:
    string school;
    string teacher;
    string major;
public:
    student(){}
    student(string d,string e,string f,string a,int b,int c):stu(a,b,c){
        school=d;
        teacher=e;
        major=f;
    }
    void show2(){
        cout<<school<<"->"<<teacher<<"->"<<major<<endl;
    }
};

int main(){
    string name,school,teacher,major;
    int num,cla;
    cin>>name>>num>>cla>>school>>teacher>>major;
    stu x1(name,num,cla);
    x1.show1();
    student x2(school,teacher,major,name,num,cla);
    x2.show2();
    return 0;
}