#include <stdio.h> 
#include <stdlib.h> 
#include <fcntl.h> 
#include <sys\stat.h> 
#include <io.h> 
#include <string.h> 

int main(void) 
{ 
   int handle; 
   char string[40]; 
   int length, res; 

   /* 
    Create a file named "TEST.$$$" in the current directory and write 
    a string to it.  If "TEST.$$$" already exists, it will be overwritten. 
   */ 

   if ((handle = open("TEST.$$$", O_WRONLY | O_CREAT | O_TRUNC, 
                         S_IREAD | S_IWRITE)) == -1) 
   { 
      printf("Error opening file.\n"); 
      exit(1); 
   } 

   strcpy(string, "Hello, world!\n"); 
   length = strlen(string); 

   if ((res = write(handle, string, length)) != length) 
   { 
      printf("Error writing to the file.\n"); 
      exit(1); 
   } 
   printf("Wrote %d bytes to the file.\n", res); 

   close(handle); 
   return 0; 
}