list<struct> c.erase

#include<iostream>
#include<list>
#include<string>
using namespace std;
struct students
{
    string name;
    int num;
    string sex;
    int age;
};
////////////////////////////////////
void input(list<students> &s);
void del(list<students> &s);
void show(list<students> s);
////////////////////////////////////
void input(list<students> &s)
{
    int k=1;
    students temp;
    while (0!=k)
    {
        cout<<"姓名：";
        cin>>temp.name;
        cout<<"学号：";
        cin>>temp.num;
        cout<<"性别：";
        cin>>temp.sex;
        cout<<"年龄：";
        cin>>temp.age;
        s.push_back(temp);
        cout<<"继续（1） 结束（0）"<<endl;
        cin>>k;
    }

}
//------------------------------------------------------
void del(list<students> &s, const int age)
{
    list<students>::iterator i=s.begin();
    while (i!= s.end())
    {
        if(age==i->age)
        {
            s.erase(i);
        }
            ++i;
    }
}
//------------------------------------------------------------
void show(list<students> s)
{
    cout<<"姓名\t"<<"学号\t"<<"性别\t"<<"年龄\t"<<endl;
    list<students>::iterator it=s.begin();
    while (s.end()!=it)
    {
        cout<<it->name<<"\t"<<it->num<<"\t"<<it->sex<<"\t"<<it->age<<endl;
        ++it;

    }
}
/////////////////////////////////////////////////////////////
void main()
{
    list<students> data;
    input(data);
    system("cls");
    show(data);
    int a;
    cout<<"输入要删除的年龄"<<endl;
    cin>>a;
    del(data,a);//编译能通过，但到了这里程序崩溃了~~求高手指点~~~
    show(data);
}