float average(float array[5])
{
 int i;float aver,sum=array[0];
 for (i=1;i<5;i++)
      sum=sum+array[i];
      aver=sum/5;
      return(aver);}
mian()
 {
  float score[5],aver;
   int i;
   printf("input 5 scores:\n");
   for(i=0;i<5;i++)
      scanf("%f",&score[i]);
   printf("\n");
   aver=average(score);
   printf("verage score is :%5.2f\n",aver);
   }

哎呀,我还以为自己蛮认真仔细呢!没想到自己是个马虎大王啊!哎!
谢谢!