Isalnum In Dev C++

Nov 26, 2016  isalpha and isdigit functions in C with cstring examples. Isalpha(c) is a function in C which can be used to check if the passed character is an alphabet or not. It returns a non-zero value if it’s an alphabet else it returns 0. Isdigit is used to check if the first character in str is a digit and therefore a valid candidate to be converted by atoi into an integer value. See also isalnum Check if character is alphanumeric (function ) isalpha Check if character is alphabetic (function ). Isalnum Prototype: int isalnum(int ch); Header File: ctype.h (C) cctype (C) Explanation: Isalnum does exactly what is sounds like, checks if the ASCII value passed in has a character equivalent to a number of letter. It returns non-zero for true, and zero for false.

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Defined in header <cctype>

Checks if the given character is one of the 10 decimal digits: 0123456789.

The behavior is undefined if the value of ch is not representable as unsignedchar and is not equal to EOF.

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Contents

[edit]Parameters

ch - character to classify

[edit]Return value

Non-zero value if the character is a numeric character, zero otherwise.

[edit]Notes

isdigit and isxdigit are the only standard narrow character classification functions that are not affected by the currently installed C locale. although some implementations (e.g. Microsoft in 1252 codepage) may classify additional single-byte characters as digits.

Like all other functions from <cctype>, the behavior of std::isdigit is undefined if the argument's value is neither representable as unsignedchar nor equal to EOF. To use these functions safely with plain chars (or signedchars), the argument should first be converted to unsignedchar:

Similarly, they should not be directly used with standard algorithms when the iterator's value type is char or signedchar. Instead, convert the value to unsignedchar first:

[edit]See also

checks if a character is classified as a digit by a locale
(function template)[edit]
checks if a wide character is a digit
(function)[edit]
C documentation for isdigit
ASCII values characters

iscntrl
iswcntrl

isprint
iswprint

isspace
iswspace

isblank
iswblank

isgraph
iswgraph

ispunct
iswpunct

isalnum
iswalnum

isalpha
iswalpha

isupper
iswupper

islower
iswlower

isdigit
iswdigit

isxdigit
iswxdigit

decimal hexadecimal octal
0–8x0–x80–10 control codes (NUL, etc.)≠000000000000
9x911 tab (t)≠00≠0≠000000000
10–13xA–xD12–15 whitespaces (n, v, f, r)≠00≠0000000000
14–31xE–x1F16–37 control codes≠000000000000
32x2040 space0≠0≠0≠000000000
33–47x21–x2F41–57!'#$%&'()*+,-./0≠000≠0≠0000000
48–57x30–x3960–7101234567890≠000≠00≠0000≠0≠0
58–64x3A–x4072–100:;<=>?@0≠000≠0≠0000000
65–70x41–x46101–106ABCDEF0≠000≠00≠0≠0≠000≠0
71–90x47–x5A107–132GHIJKLMNOP
QRSTUVWXYZ		0≠000≠00≠0≠0≠0000
91–96x5B–x60133–140[]^_`0≠000≠0≠0000000
97–102x61–x66141–146abcdef0≠000≠00≠0≠00≠00≠0
103–122x67–x7A147–172ghijklmnop
qrstuvwxyz		0≠000≠00≠0≠00≠000
123–126x7B–x7E172–176{ }~0≠000≠0≠0000000
127x7F177 backspace character (DEL)≠000000000000
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Description

The C library function int isalnum(int c) checks if the passed character is alphanumeric.

Declaration

Following is the declaration for isalnum() function.

Parameters

Isalnum In Dev C Language

  • c − This is the character to be checked.

Return Value

This function returns non-zero value if c is a digit or a letter, else it returns 0.

Dev C++ Online

Example

The following example shows the usage of isalnum() function.

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Let us compile and run the above program, to produce the following result −

ctype_h.htm
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