codeaft@codeaft:~$ octave
...
octave> codeaft = "Codeaft#12"
codeaft = Codeaft#12
octave> isalpha(codeaft)
ans =

  1  1  1  1  1  1  1  1  1  1  1  1  0  0  0

octave> isalnum(codeaft)
ans =

  1  1  1  1  1  1  1  1  1  1  1  1  0  1  1

octave> isdigit(codeaft)
ans =

  0  0  0  0  0  0  0  0  0  0  0  0  0  1  1

octave> isascii(codeaft)
ans =

  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1

octave> isletter(codeaft)
ans =

  1  1  1  1  1  1  1  1  1  1  1  1  0  0  0

octave> isupper(codeaft)
ans =

  1  0  0  0  0  0  0  0  0  0  0  0  0  0  0

octave> islower(codeaft)
ans =

  0  1  1  1  1  1  1  1  1  1  1  1  0  0  0

octave> isspace(codeaft)
ans =

  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0