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#include<iostream>
using namespace std;
 
int reverse(node*&head)
{
    node*c = head;
    node*p = NULL;
    node*n;
 
    while(c!=NULL)
    {
        n = c->next;
        c -> next = p;
        p=c;
        c=n;
    }
    head = p;
}
 
void print(node*head)
{
   node *temp = head;
   while(temp!=NULL)
   {
       cout<<temp->data<<" ";
       temp = temp->next;
   }
}
 
 
int main()
{
    int n;
    cin>>n;
    reverse(head);
    print(head);
}

prog.cpp:4:13: error: ‘node’ was not declared in this scope
 int reverse(node*&head)
             ^~~~
prog.cpp:4:19: error: ‘head’ was not declared in this scope
 int reverse(node*&head)
                   ^~~~

Standard output is empty