一個函數里有多個return，返回第一個return，所以你后面的printf就沒法執行了

#include?<stdio.h>

????void?Sum(int?score[]);

????void?Max(int?score[]);

????void?Min(int?score[]);

????void?Ave(int?score[]);

????void?Fun(int?score[]);

int?main()

{

????int?score[10]={67,98,75,63,82,79,81,91,66,84};

????Sum(score);

????Max(score);

????Min(score);

????Ave(score);

????Fun(score);

????return?0;

}

void?Sum(int?score[])

{

????int?sum=0;

????for(int?i=0;i<10;i++)

????{

???????sum+=score[i];

????}

????printf("總分為:%d\n",sum);

}

void?Max(int?score[])

{

?int?max=0;

?for(int?i=0;i<10;i++)

?{

??if(score[i]>max)

?????max=score[i];

?}

?printf("MAX=%d\n",max);

}

void?Min(int?score[])

{

?int?min=score[0];

?for(int?i=1;i<10;i++)

?{

??if(score[i]<min)

?????min=score[i];

?}

?printf("MIN=%d\n",min);

}

void?Ave(int?score[])

{

?int?sum=0;

?float?ave;

?for(int?i=0;i<10;i++)

?{

??sum+=score[i];

?}

?ave=(float)sum/10;

?printf("AVERAGE=%.2f\n",ave);

}

void?Fun(int?score[])

{

?for(int?i=10;i>=0;i--)

?{

??for(int?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;

????}

?}

?printf("降級排序為:\n");?

??for(int?i=0;i<10;i++)

??????printf("?%d?",score[i]);

}

主函數里return sum干什么.....