#include<stdio.h>
#include"def.h"

struct student * del(struct student * head, long num)
{
	struct student *p1,*p2;
	if(head==NULL)
		{printf("\nList null!\n");goto end;}
	p1=head;
	while((num!=p1->num)&&(p1->next!=NULL))
		{
			p2=p1;
			p1=p1->next;
		}
	if(num==p1->num)
		{
			if(p1==head)
				head=p1->next;
			else
				p2->next=p1->next;
			printf("\nthe value %ld was deleted!\n",num);
			n=n-1;
		}
	else
		printf("\nThe value %ld is not found!\n",num);
	end:
	return (head);
}