SOS，帮我看看吧，不知道哪里错了

Question

#include <stdio.h>
#include <stdlib.h>
double statistics(int *score,int num,int *maxId,int minId);
int main()
{
int score[200],num,maxId,minId;
double average;
scanf("%d",&num);
FILEfp;
fp=fopen("成绩.txt","r");
for(int i=0;i<num;i++)
{
fscanf(fp,"%d",&score[i]);
}
fclose(fp);
statistics(&score[200],num,&maxId,&minId);
printf("%d %d %lf",maxId,minId,average);
return 0;
}
double statistics(int *score,int num,int *maxId,int *minId)
{
int sum=0;
double average;
*maxId=score[0];
*minId=score[0];
for(int i=0;i<num;i++)
{
if(*maxId<=score[i])
*maxId=score[i];
}
for(int i=0;i<num;i++)
{
if(*minId>=score[i])
*minId=score[i];
}
for(int i=0;i<num;i++)
{
sum+=score[i];
}
average=sum/num;
return average;
}

Answer 1

修改如下，供参考：

#include <stdio.h>
#include <stdlib.h>
double statistics(int *score,int num,int *maxId,int *minId);
int main()
{
    int i,score[200],num,maxId,minId;//修改
    double average;
    scanf("%d",&num);
    FILE* fp;
    fp=fopen("成绩.txt","r");
    if(fp != NULL) {          //修改
        for(i=0;i<num;i++)
           if(fscanf(fp,"%d",&score[i]) != 1) break;//修改
        fclose(fp);
        average = statistics(score,i,&maxId,&minId);//修改
          //statistics(&score[200],num,&maxId,&minId);
        printf("%d %d %lf",maxId,minId,average);
    }
    else
        printf("Open file fail!\n");//修改

    return 0;
}
double statistics(int *score,int num,int *maxId,int *minId)
{
    int sum=0;
    double average=0;
    *maxId=score[0];
    *minId=score[0];
    for(int i=0;i<num;i++) //修改
    {
        if(*maxId < score[i]) //修改
           *maxId=score[i];
        if(*minId > score[i]) //修改
           *minId=score[i];
        sum+=score[i];
    }
    if(num != 0) //修改
       average=(double)sum/num; //修改
    return average;
}