函数名: mkdir 
 功  能: 建立一个目录 
 用  法: #include <dir.h> 
         int mkdir(char *pathname); 
 程序例: 
#include <stdio.h> 
 #include <conio.h> 
 #include <process.h> 
 #include <dir.h> 
int main(void) 
 { 
   int status; 
   clrscr(); 
    status = mkdir("asdfjklm"); 
    (!status) ? (printf("Directory created\n")) : 
                (printf("Unable to create directory\n")); 
   getch(); 
    system("dir"); 
    getch(); 
   status = rmdir("asdfjklm"); 
    (!status) ? (printf("Directory deleted\n")) : 
   (perror("Unable to delete directory")); 
   return 0; 
 }