Microsoft Visual C++ V6.0出现：fatal error C1021: invalid preprocessor command 'difine'

# include<stdio.h >
# include <malloc.h>
#difine NULL 0
#difine LEN sizcof(struct number)

struct number
{int num ;
struct number *next;
};

int n；

struct number *creat(void)
{ struct number *head;
struct number *p1,*p2;
n=0：
p1=p2= (struct number*)malloc(LEN);
scanf("%d",&p1->num);
head=NULL;
while (p1->num!=0)
{n=n+1;
If(n= =0)head=p1;
else p2->next=p1;
p2=p1;
p1= (struct number *)malloc(LEN);
scanf("%d",&p1->num);
}
p2->next=NULL;
return (head);
}

void Print(struct number *head)
{struct number *p;
printf ("\nNow, These %d records are :\n",n);
p=head;
if (head!=NULL)
do
{printf ("%d ",p->num);
p=p->next;
}while (p!=NULL);
}

struct number*Remove(struct number *head,int num)
if(head==NULL) {printf ("\nlist null! \n");goto end;
return;}
p1=head;
while(num!=p1->num &&p1->next!==NULL)
{p1=p2;p1=p1->next;}
if(num= =p1->num)
{if(p1==head)head=p1->next;
else p2->next =p1->next;
printf("remove:% d\n",num);
}
else printf("%d not been found !\n", num );
return(head);
}

int length(struct number*head)
{int i=0;
struct number*p;
p=head;
while(p!=NULL)
{p=p->next;i++;
}
return i;
}

struct number *Insert (struct number*head, struct number *stud)
{struct number *p0,*p1,*p2;
p1=head;
p0=stud;
if (head= =NULL)
{head=p0;p0->next=NULL;}
else
scanf("%d,%d",n,count);
while ( n>=0 && n < length(head) )
{p2=p1;
p1=p1->next;
n=n+1;
}
if (n=length(head)) p1->next=p0;p0->next=NULL;
return (head);
}

运行以后：
--------------------Configuration: danxinglian - Win32 Debug--------------------
Compiling...
lianbiao.c
c:\documents and settings\atiya\桌面\visual c++\myprojects\danxinglian\lianbiao.c(3) : fatal error C1021: invalid preprocessor command 'difine'
执行 cl.exe 时出错.

danxinglian.exe - 1 error(s), 0 warning(s)
怎么改程序才能正常运行啊？？？
万分感谢！
define 改过来以后错误还是很多~~~~

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