函数名: creatnew 
 功  能: 创建一个新文件 
 用  法: #include <dos.h> 
         int creatnew(const char *filename, int attrib); 
 程序例: 
#include <string.h> 
 #include <stdio.h> 
 #include <errno.h> 
 #include <dos.h> 
 #include <io.h> 
int main(void) 
 { 
    int handle; 
    char buf[11] = "0123456789"; 
   /* attempt to create a file that doesn't already exist */ 
    handle = creatnew("DUMMY.FIL", 0); 
   if (handle == -1) 
       printf("DUMMY.FIL already exists.\n"); 
    else 
    { 
       printf("DUMMY.FIL successfully created.\n"); 
       write(handle, buf, strlen(buf)); 
       close(handle); 
    } 
    return 0; 
 }