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HP C
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Indicates if a character is classed as a digit in the program's current locale.
#include <ctype.h>int isdigit (int character);
character
An object of type int . The value of character must be representable as an unsigned char or must equal the value of the macro EOF. If it has any other value, the behavior is undefined.
nonzero If a decimal digit. 0 If not a decimal digit.
Indicates if a character is classed as a graphic character in the program's current locale.
#include <ctype.h>int isgraph (int character);
character
An object of type int . The value of character must be representable as an unsigned char or must equal the value of the macro EOF. If it has any other value, the behavior is undefined.
nonzero If a graphic character. 0 If not a graphic character.
Indicates if a character is classed as a lowercase character in the program's current locale.
#include <ctype.h>int islower (int character);
character
An object of type int . The value of character must be representable as an unsigned char or must equal the value of the macro EOF. If it has any other value, the behavior is undefined.
nonzero If a lowercase alphabetic character. 0 If not a lowercase alphabetic character.
Tests for a NaN. Returns 1 if the argument is NaN; 0 if not.
#include <math.h>int isnan (double x);
int isnanf (float x);
int isnanl (long double x);
x
A real value.
The isnan functions return the integer value 1 (TRUE) if x is NaN (the IEEE floating point reserved not-a-number value); otherwise, they return the value 0 (FALSE).
Indicates if a character is classed as a printing character in the program's current locale.
#include <ctype.h>int isprint (int character);
character
An object of type int . The value of character must be representable as an unsigned char or must equal the value of the macro EOF. If it has any other value, the behavior is undefined.
nonzero If a printing character. 0 If not a printing character.
Indicates if a character is classed as a punctuation character in the program's current locale.
#include <ctype.h>int ispunct (int character);
character
An object of type int . The value of character must be representable as an unsigned char or must equal the value of the macro EOF. If it has any other value, the behavior is undefined.
nonzero If a punctuation character. 0 If not a punctuation character.
Indicates if a character is classed as white space in the program's current locale; that is, if it is an ASCII space, tab (horizontal or vertical), carriage-return, form-feed, or new-line character.
#include <ctype.h>int isspace (int character);
character
An object of type int . The value of character must be representable as an unsigned char or must equal the value of the macro EOF. If it has any other value, the behavior is undefined.
nonzero If a white-space character. 0 If not a white-space character.
Indicates if a character is classed as an uppercase character in the program's current locale.
#include <ctype.h>int isupper (int character);
character
An object of type int . The value of character must be representable as an unsigned char or must equal the value of the macro EOF. If it has any other value, the behavior is undefined.
nonzero If an uppercase alphabetic character. 0 If not an uppercase alphabetic character.
Indicates if a wide character is classed either as alphabetic or as a digit in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswalnum (wint_t wc);
wc
An object of type wint_t . The value of character must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If alphanumeric. 0 If not alphanumeric.
Indicates if a wide character is classed as an alphabetic character in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswalpha (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If alphabetic. 0 If not alphabetic.
Indicates if a wide character is classed as a control character in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswcntrl (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If a control character. 0 If not a control character.
Indicates if a wide character has a specified property.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswctype (wint_t wc, wctype_t wc_prop);
wc
An object of type wint_t . The value of wc must be representable as a valid wide-character code in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.wc_prop
A valid property name in the current locale. This is set up by calling the wctype function.
The iswctype function tests whether wc has the character-class property wc_prop. Set wc_prop by calling the wctype function.See also wctype .
nonzero If the character has the property wc_prop. 0 If the character does not have the property wc_prop.
#include <locale.h> #include <wchar.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <ctype.h> /* This test will set up the "upper" character class using */ /* wctype() and then verify whether the characters 'a' and 'A' */ /* are members of this class */ #include <stdlib.h> main() { wchar_t w_char1, w_char2; wctype_t ret_val; char *char1 = "a"; char *char2 = "A"; ret_val = wctype("upper"); /* Convert char1 to wide-character format - w_char1 */ if (mbtowc(&w_char1, char1, 1) == -1) { perror("mbtowc"); exit(EXIT_FAILURE); } if (iswctype((wint_t) w_char1, ret_val)) printf("[%C] is a member of the character class upper\n", w_char1); else printf("[%C] is not a member of the character class upper\n", w_char1); /* Convert char2 to wide-character format - w_char2 */ if (mbtowc(&w_char2, char2, 1) == -1) { perror("mbtowc"); exit(EXIT_FAILURE); } if (iswctype((wint_t) w_char2, ret_val)) printf("[%C] is a member of the character class upper\n", w_char2); else printf("[%C] is not a member of the character class upper\n", w_char2); }Running the example program produces the following result:
[a] is not a member of the character class upper [A] is a member of the character class upper
Indicates if a wide character is classed as a digit in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswdigit (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If a decimal digit. 0 If not a decimal digit.
Indicates if a wide character is classed as a graphic character in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswgraph (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If a graphic character. 0 If not a graphic character.
Indicates if a wide character is classed as a lowercase character in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswlower (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If a lowercase character. 0 If not a lowercase character.
Indicates if a wide character is classed as a printing character in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswprint (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If a printing character. 0 If not a printing character.
Indicates if a wide character is classed as a punctuation character in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswpunct (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If a punctuation character. 0 If not a punctuation character.
Indicates if a wide character is classed as a space character in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswspace (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If a white-space character. 0 If not a white-space character.
Indicates if a wide character is classed as an uppercase character in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswupper (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If an uppercase character. 0 If not an uppercase character.
Indicates if a wide character is a hexadecimal digit (0 to 9, A to F, or a to f) in the program's current locale.
#include <wctype.h> (ISO C)#include <wchar.h> (XPG4)
int iswxdigit (wint_t wc);
wc
An object of type wint_t . The value of wc must be representable as a wchar_t in the current locale, or must equal the value of the macro WEOF. If it has any other value, the behavior is undefined.
nonzero If a hexadecimal digit. 0 If not a hexadecimal digit.
Indicates if a character is a hexadecimal digit (0 to 9, A to F, or a to f) in the program's current locale.
#include <ctype.h>int isxdigit (int character);
character
An object of type int . The value of character must be representable as an unsigned char in the current locale, or must equal the value of the macro EOF. If it has any other value, the behavior is undefined.
nonzero If a hexadecimal digit. 0 If not a hexadecimal digit.
Compute Bessel functions of the first kind.
#include <math.h>double j0 (double x);
float j0f (float x);
long double j0l (long double x);
double j1 (double x);
float j1f (float x);
long double j1l (long double x);
double jn (int n, double x);
float jnf (int n, float x);
long double jnl (int n, long double x);
x
A real value.n
An integer.
The j0 functions return the value of the Bessel function of the first kind of order 0.The j1 functions return the value of the Bessel function of the first kind of order 1.
The jn functions return the value of the Bessel function of the first kind of order n.
The j1 and jn functions can result in an underflow as x gets small. The largest value of x for which this occurs is a function of n.
x The relevant Bessel value of x of the first kind. 0 The value of the x argument is too large, or underflow occurred; errno is set to ERANGE. NaN x is NaN; errno is set to EDOM.
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