一道c语言题

#include <stdio.h>
FILE *stream;
#define MAXNUM  5
struct student
{
    char name[32];
    float score;
};
void main()
{
    struct student st[MAXNUM];
    int i = 0, count = 0;
    float ave, max=0, min=0, sum=0, top[3]={0};
    stream = fopen( "data.txt", "w+" );
    if( stream == NULL )
        printf( "The file fscanf.out was not opened\n" );
    else
    {
        for(i = 0; i < MAXNUM; i++)
        {
            printf("请输入第%d位学生的信息\n姓名：", i+1);
            scanf("%s", st[i].name);
            printf("成绩：");
            scanf("%f", &st[i].score);
            fprintf(stream,"%s    %f\n",st[i].name,st[i].score);
            sum += st[i].score;
            if (st[i].score>max)
            {
                max = st[i].score;
            }
            if (st[i].score<min)
            {
                min = st[i].score;
            }
            if (st[i].score>top[2])
            {
                top[2] = st[i].score;
                if (st[i].score>top[1])
                {
                    top[2] = top[1];
                    top[2] = st[i].score;
                    if (st[i].score>top[0])
                    {
                        top[1] = top[0];
                        top[0] = st[i].score;
                    }
                }
            }
        }
        ave=sum/MAXNUM;
        for (i = 0; i < MAXNUM; i++)
        {
            if(ave<st[i].score)
                count++;
        }
        fprintf(stream,"最高分：%f；最低分：%f；平均分：%f；\n", max, min, ave);
        fprintf(stream,"第一名：%f；第二名：%f；第三名：%f；\n", top[0], top[1], top[2]);
        fprintf(stream,"超过平均分的人数：%d\n", count);
        printf("最高分：%d；最低分：%d；平均分：%d；\n", max, min, ave);
    } 
    fclose(stream);
}