求大佬看一下这个排序问题出在哪里

Question

#include <stdio.h>int main(){    int score[]={67,98,75,63,82,79,81,91,66,84};    int i;    void sort(int a[]);    void average(int a[]);    average(score);    sort(score);    printf("max=%d,min=%d\nsort:",score[0],score[9]);    for(i=0;i<10;i++)    printf("%d ",score[i]);    printf("\n");    return 0;}void average(int a[]){    int sum=0,i;    for(i=0;i<10;i++)    sum+=a[i];    float average=sum/10;    printf("sum=%d\naverage=%.2f\n",sum,average);}void sort(int a[]){    int i,j;    void exchange(int a,int b);    for(i=0;i<10;i++)        for(j=i+1;j<10;j++)    exchange(a[i],a[j]);}void exchange(int a,int b){    int temp;    if(a>b)    {        temp=a;        a=b;        b=temp;    }}输出之后还是原顺序怎么回事