函数名: isatty

功 能: 检查设备类型

用 法: int isatty(int handle);

程序例:

#include <stdio.h>

#include <io.h>

int main(void)

{

int handle;

handle = fileno(stdprn);

if (isatty(handle))

printf("Handle %d is a device type\", handle);

else

printf("Handle %d isn't a device type\", handle);

return 0;

}