[root@localhost c]# cat switch_case
main()
{
unsigned short x;
char c;
scanf("%d,$c",&x,&c);
switch (c)
{
case 'D': printf("%dD\n",x);
break;
case 'O': printf("%oO\n",x);
break;
case 'X': printf("$xX\n",x);
break;
default : printf("input error\n !");
}
}

[root@localhost c]# gcc --version
gcc (GCC) 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[root@localhost c]# gcc switch_case
/usr/bin/ld:switch_case: file format not recognized; treating as linker script
/usr/bin/ld:switch_case:1: parse error
collect2: ld returned 1 exit status
[root@localhost c]#

help me!!
thanks i!!!