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

class student
{
private:
    int num;
    string name;
    float grade;
public:
    student();
    void put(student *this);
};

student::student()
{
num=0;
name="none";
grade=0;
}

void student::put(student *this)
{
cout<<this->num<<endl;
cout<<this->name<<endl;
cout<<this->grade<<endl;
}

void main()
{
student stu;
stu.put(&stu);
}

本想用此程序来验证一下this指针的用法的，却无论如何都无法运行~请问哪儿出了错？

#include<iostream>
using namespace std;

class time
{
private:
int hour;
int minu;
int seco;
public:
void put();
void set();
time(int a,int b,int c);
};
time::time(int a,int b,int c):hour(a),minu(b),seco(c){}

void time::set()
{
cin>>hour>>minu>>seco;
}

void time::put()
{
cout<<hour<<':'<<minu<<':'<<seco<<endl;
}

void main()
{
time t1(17,34,30);
time *const p;
p=&t1;

}
主函数中关于常指针又编译出错~我感觉没错呀~哎·....