C语言简单程序 求指教

#include "stdio.h"
int main(void)
{
int day,month,year;
printf ("ENTER THE DATE (dd/mm/yy):");
scanf ("%d%d%d",&day,&month,&year);
printf ("DATE THIS %d",day);
printf (" Day of ");
switch (day)
{
case 1:case 21 : case 31: printf ("st");break;
case 2: case 22: printf("nd"); break;
case 3: case 23 : printf ("th");break;
default : printf ("th");break; }

switch (month)
{ case 1:printf ("Jan.");break;
case 2:printf ("Feb.");break;
case 3:printf ("Mar.");break;
case 4:printf ("Apr..");break;
case 5:printf ("May.");break;
case 6:printf ("Jue.");break;
case 7:printf ("Jul.");break;
case 8:printf ("Aug.");break;
case 9:printf ("Sept.");break;
case 10:printf ("Oct.");break;
case 11:printf ("Nev.");break;
case 12:printf ("Dce.");break;
printf ("%d\n",year);}
return (0);

}

printf ("ENTER THE DATE (dd/mm/yy):");
scanf ("%d%d%d,&day",&month,&year);引号移动一下

case 12:printf ("Dec.");break;}
printf (",20%d\n",year);