?for(i=N-2;i>=0;i--){
??for(j=0;j<=i;j++){
??
?n-2的時候，j最大值是i=N-2，就是8，然后下邊比較arr[8]和arr[9]的大小關系。arr[9]已經是最后一個元素。?如果上邊寫n-1的話下邊判斷數組元素大小j+1的時候就越界了。

#include <stdio.h>
#define N 10
void printScore(int score[]){
??? int i;
?printf("\n");
?for(i=0;i<N;i++){
??printf("%d\t",score[i]);
?}
?printf("\n");
}
int getTotalScore(int score[]){
?int sum = 0;
?int i;
?for(i=0;i<N;i++){
??sum+=score[i];
?}
?return sum;
}
int getAvgScore(int score[]){
?return getTotalScore(score)/N;
}
int getMax(int score[]){
?int max = -1;
?int i;
?for(i=0;i<N;i++){
??if(score[i]>max){
???max = score[i];
??}
?}
?return max;
}
int getMin(int score[]){
?int min = 100;
?int i;
?for(i=0;i<N;i++){
??if(score[i]<min){
???min=score[i];
??}
?}
?return min;
}
void sort(int score[]){
?int i,j;
?for(i=N-2;i>=0;i--){
??for(j=0;j<=i;j++){
???if(score[j]<score[j+1]){
????int temp;
????temp = score[j];
????score[j] = score[j+1];
????score[j+1] = temp;
???}
??}
?}
?printScore(score);
}
int main()
{
??? int score[N]={67,98,75,63,82,79,81,91,66,84};
??? int sum,avg,max,min;
???? sum = getTotalScore(score);
???? avg = getAvgScore(score);
???? max = getMax(score);
? min = getMin(score);
??? printf("總分是：%d\n",sum);
?printf("平均分是：%d\n",avg);
?printf("最高分是：%d\n",max);
?printf("最低分是：%d\n\n",min);
?printf("********成績排名********\n");
?sort(score);
??? return 0;
}