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Manual Reference Pages  - isalnum (3)

NAME

isalnum,isalpha,iscntrl,isdigit,isgraph,islower, isprint,ispunct,isspace,isupper, isascii,isblank,isxdigit(3f) - [M_strings:COMPARE] test membership in subsets of ASCII set (LICENSE:PD)

CONTENTS

Synopsis
Description
Examples
Author
License

SYNOPSIS

Where "FUNCNAME" is one of the function names in the group, the functions are defined by

    elemental function FUNCNAME(onechar)
    character,intent(in) :: onechar
    logical              :: FUNC_NAME

DESCRIPTION

These elemental functions test if a character belongs to various subsets of the ASCII character set.
isalnum
  returns .true. if character is a letter (a-z,A-Z) or digit (0-9)
isalpha
  returns .true. if character is a letter and
isascii
  returns .true. if character is in the range char(0) to char(127)
isblank
  returns .true. if character is a blank (space or horizontal tab).
iscntrl
  returns .true. if character is a delete character or ordinary control character (0x7F or 0x00-0x1F).
isdigit
  returns .true. if character is a digit (0,1,...,9) and .false. otherwise
isgraph
  returns .true. if character is a printable ASCII character excluding space
islower
  returns .true. if character is a miniscule letter (a-z)
isprint
  returns .true. if character is a printable ASCII character
ispunct
  returns .true. if character is a printable punctuation character (isgraph(c) && !isalnum(c)).
isspace
  returns .true. if character is a null, space, tab, carriage return, new line, vertical tab, or formfeed
isupper
  returns .true. if character is an uppercase letter (A-Z)
isxdigit
  returns .true. if character is a hexadecimal digit (0-9, a-f, or A-F).

EXAMPLES

Sample Program:

   program demo_isdigit

use M_strings, only : isdigit, isspace, switch implicit none character(len=10),allocatable :: string(:) integer :: i string=[& & ’1 2 3 4 5 ’ ,& & ’letters ’ ,& & ’1234567890’ ,& & ’both 8787 ’ ] ! if string is nothing but digits and whitespace return .true. do i=1,size(string) write(*,’(a)’,advance=’no’)’For string[’//string(i)//’]’ write(*,*) & all(isdigit(switch(string(i))) .or. & & isspace(switch(string(i)))) enddo

end program demo_isdigit

Expected output:

   For string[1 2 3 4 5 ] T
   For string[letters   ] F
   For string[1234567890] T
   For string[both 8787 ] F

AUTHOR

John S. Urban

LICENSE

Public Domain


isalnum (3) March 11, 2021
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