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1 | .\" Copyright (c) 1991 The Regents of the University of California. |
2 | .\" All rights reserved. | |
3 | .\" | |
4 | .\" This code is derived from software contributed to Berkeley by | |
5 | .\" the American National Standards Committee X3, on Information | |
6 | .\" Processing Systems. | |
7 | .\" | |
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8 | .\" Redistribution and use in source and binary forms, with or without |
9 | .\" modification, are permitted provided that the following conditions | |
10 | .\" are met: | |
11 | .\" 1. Redistributions of source code must retain the above copyright | |
12 | .\" notice, this list of conditions and the following disclaimer. | |
13 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
14 | .\" notice, this list of conditions and the following disclaimer in the | |
15 | .\" documentation and/or other materials provided with the distribution. | |
16 | .\" 3. All advertising materials mentioning features or use of this software | |
17 | .\" must display the following acknowledgement: | |
18 | .\" This product includes software developed by the University of | |
19 | .\" California, Berkeley and its contributors. | |
20 | .\" 4. Neither the name of the University nor the names of its contributors | |
21 | .\" may be used to endorse or promote products derived from this software | |
22 | .\" without specific prior written permission. | |
23 | .\" | |
24 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | .\" SUCH DAMAGE. | |
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35 | .\" |
36 | .\" @(#)isdigit.3 5.2 (Berkeley) 6/29/91 | |
37 | .\" | |
38 | .Dd June 29, 1991 | |
39 | .Dt ISDIGIT 3 | |
40 | .Os | |
41 | .Sh NAME | |
42 | .Nm isdigit | |
43 | .Nd decimal-digit character test | |
44 | .Sh SYNOPSIS | |
45 | .Fd #include <ctype.h> | |
46 | .Ft int | |
47 | .Fn isdigit "int c" | |
48 | .Sh DESCRIPTION | |
49 | The | |
50 | .Fn isdigit | |
51 | function tests for any decimal-digit character. | |
52 | .Sh RETURN VALUES | |
53 | The | |
54 | .Fn isdigit | |
55 | macro returns zero if the character tests false and | |
56 | returns non-zero if the character tests true. | |
57 | .Sh SEE ALSO | |
58 | .Xr isascii 3 , | |
59 | .Xr isalnum 3 , | |
60 | .Xr isalpha 3 , | |
61 | .Xr iscntrl 3 , | |
62 | .Xr isdigit 3 , | |
63 | .Xr isgraph 3 , | |
64 | .Xr islower 3 , | |
65 | .Xr isprint 3 , | |
66 | .Xr ispunct 3 , | |
67 | .Xr isspace 3 , | |
68 | .Xr isupper 3 , | |
69 | .Xr isxdigit 3 , | |
70 | .Xr toascii 3 , | |
71 | .Xr tolower 3 , | |
72 | .Xr toupper 3 , | |
73 | .Xr stdio 3 | |
74 | .Xr ascii 7 | |
75 | .Sh STANDARDS | |
76 | The | |
77 | .Fn isdigit | |
78 | function conforms to | |
79 | .St -ansiC . |