Printing different representations of characters...

[smoothdogg00]

First let me start by saying I am new to C. My program needs to read in a character in binary(including non-printable characters) and then display the character in octal representation, like the 'od' program does in UNIX. My code is as follows:

  int c;

  FILE *Fp;
  Fp = fopen(argv[1], "rb");

  while((c = fgetc(Fp)) != EOF)
   {
      fprintf(stdout, "%06ho\t", c);
    }

  fclose(Fp);

The two program results are as follows:

[solaris]$ myod test
000150 000145 000154 000154 000157 000040 000167 000157 000162 000154 000144 000012

[solaris]$ od test
0000000 064145 066154 067440 073557 071154 062012
0000014

"%06ho" was given to me for formatting purposes, so I know that is correct.

I'll admit, I don't really understand...basically typing "myod test" should perform the same function as typing "od test", where test is a binary file.

Thanks for your help.

[quzah]

Your int is probably signed. ho is for unsigned short. See this.


Quzah.

[Dave_Sinkula]

Consider using fread, perhaps like this.

   if ( Fp != NULL )
   {
      unsigned short c;
      while ( fread(&c, sizeof c, 1, Fp) == 1 )
      {
         printf("%06ho ", c);
      }
      fclose(Fp);
   }

[WaltP]

I remember answering this yesterday. Must have been on another forum...