---
name: "isprint"
section: "3"
platform: "macos"
package: "Libc"
version: "1752.120.2"
release: "macOS 26.5"
platforms: ["linux", "freebsd", "macos"]
url: "https://new.carta.tech/isprint"
---

# isprint(3)

printing character test (space character inclusive)

## NAME

**isprint** – printing character test (space character inclusive)

## LIBRARY

Standard C Library (libc, -lc)

## SYNOPSIS

**#include \<ctype.h\>**

*int*\

**isprint**(*int c*);

## DESCRIPTION

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 (preceded by their numeric values, in octal):

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

## RETURN VALUES

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

## COMPATIBILITY

The 4.4BSD 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.

## SEE ALSO

[ctype(3)](/ctype/3.md), [isalnum\_l(3)](/isalnum_l/3.md), [iswprint(3)](/iswprint/3.md), [ascii(7)](/ascii/7.md)

## STANDARDS

The **isprint**() function conforms to ISO/IEC 9899:1990 (“ISO C90”).