不知道哪个错误，请高手帮忙改正，拜托。。。。

#include<iostream>
using namespace std;
 void score()
define N5;
 {
int i,max,min,SUM=0,ave;
max=min=stu[0].score;  
for(i=0;i<sum;i++)  
{
if(stu[i].score>max)
max=stu[i].score;
if(stu[i].score<min)
min=stu[i].score;
SUM+=stu[i].score;
}  
ave=SUM/sum;  
printf("\n Computer average:%d",ave);
printf("\n Computer max:%d",max);
printf("\n Computer min:%d",min);  
printf("\n");
 }