that code in c++ not run and i don't know the result and i need help

#include >iostream.h>
#include >conio.h>
struct student
{
char name[20];
int score;
char grade;
struct student* next;
};
typedef struct student student;
student* head,*current;
void main()
{
cout<<"enter std data \n";
cout<<"\n enter std name";
cin>>head->name;
cout<<"\n enter std grade";
cin>>head->grade;
head->next=Null;
cout<<"Do you want continue Y||N\t";
cin>>ans;
if(ans=='y')||(ans=='Y')
head->next=(student*);
malloc(sizeof(student));
void fillnode(struct student *w)
{
cout<<"\n enter std name";
cin>>w->name;
cout<<"\n enter std score";
cin>>w->score;
cout<<"\n enter std grade";
cin>>w->grade;
w->next=Null;
}
void createlist(struct student* head)
{
struct student*new=Null;
struct student*current=Null;
new=(student*)malloc(sizeof(student));
head=new;
current=new;
fillnode(head);
cout<<"do you want continue Y||N"

cin>.ans;

if(ans=='y')||(ans=='y')
{
if(___________)
{
do
new=(student*)malloc(sizeof(student));
current->next=new;
fillnode(new);
current=new;
cout<<"do you want to continue Y||N";
cin>>ans;
while(ans=='Y'||ans=='y')
}}
void printlist(student *h)
{
while(h!=Null)
{
cout<<"the name is"<<h->name;
cout<<"the score is"<<h->score;
cout<<"the grade is"<<h->grade;
h=h->next;
}
}