# include "stdio.h"
void main( )
{ int a,b,c,d,i,aver;
char s;
i=1;
while (i)
 {
  printf ("%s","請輸入某位學生的各門成績:  ");
  scanf ("%d%d%d%d",&a,&b,&c,&d);
   if (a<1)
     break;
    else
     if (a<60||b<60||c<60||d<60)
       { printf ("%s\n","你有一門成績不及格");
         continue;  }
  aver=(a+b+c+d)/4;
  printf ("該學生的平均分為: %d\n",aver);
   }
  printf ("%s\n","程序運行完畢!");
  scanf ("%c",&s);
 }