【ACM】成績轉換

#include<stdio.h>
#include<malloc.h>
int main()
{
  int score,i=0;
  int length=1;
  int *p = (int *)malloc(sizeof(int)*length);
  while(scanf("%d",&score)!=EOF)
  {
   p[i]=score;
   i++;
   p=(int *)realloc(p,sizeof(int)*(++length));
  }
  for(i=0;i<length-1;i++)
  {
   int temp=p[i]/10;
   if((temp==9||temp==10)&&p[i]<=100) printf("%s\n","A");
   if(temp==8) printf("%s\n","B");
   if(temp==7) printf("%s\n","C");
   if(temp==6) printf("%s\n","D");
   if(temp<6&&temp>0) printf("%s\n","E");
   if(temp>10||temp<0) printf("%s\n","Score is error!");
  }
  system("pause");
 return 0; 
}