函数名: bdos

功 能: DOS系统调用

用 法: int bdos(int dosfun, unsigned dosdx, unsigned dosal);

程序例:

#include <stdio.h>

#include <dos.h>

/* Get current drive as 'A', 'B', ... */

char current_drive(void)

{

char curdrive;

/* Get current disk as 0, 1, ... */

curdrive = bdos(0x19, 0, 0);

return('A' + curdrive);

}

int main(void)

{

printf("The current drive is %c:\", current_drive());

return 0;

}