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#include  <stdio.h>
#include  <stdlib.h>
#include  <string.h>
 
struct node{
	struct node *left;
	struct node *right;
};
 
 
 
preorder(node)
{
	if(node == NULL){
		return;
	}
	preorder(p->left);
	preorder(p->right);
}
 

prog.c:12:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
 preorder(node)
 ^~~~~~~~
prog.c: In function ‘preorder’:
prog.c:12:1: warning: type of ‘node’ defaults to ‘int’ [-Wimplicit-int]
prog.c:14:10: warning: comparison between pointer and integer
  if(node == NULL){
          ^~
prog.c:15:3: warning: ‘return’ with no value, in function returning non-void
   return;
   ^~~~~~
prog.c:12:1: note: declared here
 preorder(node)
 ^~~~~~~~
prog.c:17:11: error: ‘p’ undeclared (first use in this function)
  preorder(p->left);
           ^
prog.c:17:11: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty