Example

       #include <stdio.h>
       #include <stdlib.h>
       #include <unixio.h>

       main()
       {
           FILE *fp;
           char c_ptr[130];

           /* Create a dummy data file  */

           if ((fp = fopen("file.dat", "w+")) == NULL) {
               perror("open");
               exit(1);
           }

           fprintf(fp, "this is a test\n") ;
           fclose(fp) ;

           /* Open a file with some data -"this is a test"   */

           if ((fp = fopen("file.dat", "r+")) == NULL) {
              perror("open error") ;
               exit(1);
           }

           fgets(c_ptr, 130, fp);
           puts(c_ptr);        /* Display what fgets got.  */
           fclose(fp);

           delete("file.dat") ;
       }