Manual Pages  — ISPRINT

isprint – printing character test (space character inclusive)

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES COMPATIBILITY SEE ALSO STANDARDS

Standard C Library (libc, -lc)

#include <ctype.h>

int
isprint(int c);

The isprint() function tests for any printing character, including space (‘ ’). The value of the argument must be representable as an unsigned char or the value of EOF.

In the ASCII character set, this includes the following characters (with their numeric values shown in octal):

amp;040 sp	041 ``!''	042 `` ''	043 ``#''	044 ``$''
amp;045 ``%''	046 ``&''	047 ``'''	050 ``(''	051 ``)''
amp;052 ``*''	053 ``+''	054 ``,''	055 ``-''	056 ``.''
amp;057 ``/''	060 ``0''	061 ``1''	062 ``2''	063 ``3''
amp;064 ``4''	065 ``5''	066 ``6''	067 ``7''	070 ``8''
amp;071 ``9''	072 ``:''	073 ``;''	074 ``<''	075 ``=''
amp;076 ``>''	077 ``?''	100 ``@''	101 ``A''	102 ``B''
amp;103 ``C''	104 ``D''	105 ``E''	106 ``F''	107 ``G''
amp;110 ``H''	111 ``I''	112 ``J''	113 ``K''	114 ``L''
amp;115 ``M''	116 ``N''	117 ``O''	120 ``P''	121 ``Q''
amp;122 ``R''	123 ``S''	124 ``T''	125 ``U''	126 ``V''
amp;127 ``W''	130 ``X''	131 ``Y''	132 ``Z''	133 ``[''
amp;134 ``\''	135 ``]''	136 ``^''	137 ``_''	140 ```''
amp;141 ``a''	142 ``b''	143 ``c''	144 ``d''	145 ``e''
amp;146 ``f''	147 ``g''	150 ``h''	151 ``i''	152 ``j''
amp;153 ``k''	154 ``l''	155 ``m''	156 ``n''	157 ``o''
amp;160 ``p''	161 ``q''	162 ``r''	163 ``s''	164 ``t''
amp;165 ``u''	166 ``v''	167 ``w''	170 ``x''	171 ``y''
amp;172 ``z''	173 ``{''	174 ``|''	175 ``}''	176 ``~''

The isprint() function returns zero if the character tests false and returns non-zero if the character tests true.

The BSD 4.4 extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered obsolete and may not be supported in future releases. The iswprint() function should be used instead.

The isprint() function conforms to ISO/IEC 9899:1990 ("ISO C90").