c

来自「C程序设计经典900例.zip」· 代码 · 共 12 行

#include <stdio.h>
#include <dos.h>

void main (void)
 {
   unsigned drive_count;

   _dos_setdrive(3, &drive_count);
   printf("The number of available drives is %d\n", 
     drive_count);
 }