能有哪位帮我看看这个哪里错了么

#include<stdio.h>
#include<math.h>
int main()
#define N
{
    int score[N]={67,98,75,63,82,79,81,91,66,84};
    int i,j,max,min,sum;
    float average;
    for(i=0;i<10;i++)
    {
        for(j=0;j<=i;j++)
            {
                if(score[i]<score[j+1])
                {
                    int t;
                    score[i]=t;
                    t=score[j+1];
                    score[j+1]=score[i];
                }
            }
    }
    sum+=score[i];
    average=sum/10;
    printf("考试的总分为%d\n考试的最高分为%d\n考试的最低分为%d\n考试的平均分为%1f\n",sum,max,min,average);
    printf("考试降序排序为%c",score[i]);
    return 0;
}