#include<string.h>
#include<conio.h>
#include<stdio.h>

int main(void)
{
   FILE *stream;
   char msg[] = "this is a test";
   char buf[20];

   if ((stream = fopen("1.txt", "w+"))
       == NULL)
   {
      fprintf(stderr, "Cannot open output file.\n");
      return 1;
   }

   /* write some data to the file */
   fwrite(msg, strlen(msg)+1, 1, stream);

   /* seek to the beginning of the file */
   fseek(stream, SEEK_SET, 0);

   /* read the data and display it */

   fread(buf, strlen(msg)+1, 1, stream);
   printf("%s\n", buf);
   getchar();

   fclose(stream);
   return 0;

}