question

[nearc]

what does the " *start" do?
why use "temp = new(struct node); instead of temp=new node?"
ty

  struct node

{

    int info;

    struct node *next;

    struct node *prev;

}*start;


temp = new(struct node); 

[JLBorges]

> what does the " *start" do?

It is equivalent to:

struct node 
{
     // ...
};

node* start ; // variable of type pointer to node 

> why use "temp = new(struct node); instead of temp=new node?"

There is no need to use an elaborated type specifier in this case.
Just write: node* temp = new node{} ;
elaborated type specifier: https://en.cppreference.com/w/cpp/language/elaborated_type_specifier

[nearc]

Thank You