请问这个程序怎么改正确😭

#include <stdio.h>
#include <stdlib.h>
#define LEN sizeof(struct Student)
struct Student
{long num;
float score;
struct Student * next;
};
int n;
void printf(struct Student * head)
{struct Student * p;
printf("\nNow,These %d records are:\n",n);
p=head;
if(head!=NULL)
do
{printf("%ld %5.1f\n",p->num,p->score);
p=p->next;
}while(p!=NULL);
}

printf是C语言关键词，不能用作函数名，修改一下