Defined in header <math.h> float log10f( float arg ); (1) (since C99) double log10( double arg ); (2) long double log10l( long double arg ); (3) (since C99) Defined in header <tgmath.h> #define log10( arg ) (4) (since C99) 1-3) Computes the common (base-10) logarithm of arg. 4) Type-generic macro: If arg has type long double, log10l is called. Otherwise, if arg has integer type or the type double, log10 is called. Otherwise, log10

Defined in header <math.h> float sqrtf( float arg ); (1) (since C99) double sqrt( double arg ); (2) long double sqrtl( long double arg ); (3) (since C99) Defined in header <tgmath.h> #define sqrt( arg ) (4) (since C99) 1-3) Computes square root of arg. 4) Type-generic macro: If arg has type long double, sqrtl is called. Otherwise, if arg has integer type or the type double, sqrt is called. Otherwise, sqrtf is called. If arg is com

Usage long type modifier

Defined in header <math.h> float asinhf( float arg ); (1) (since C99) double asinh( double arg ); (2) (since C99) long double asinhl( long double arg ); (3) (since C99) Defined in header <tgmath.h> #define asinh( arg ) (4) (since C99) 1-3) Computes the inverse hyperbolic sine of arg. 4) Type-generic macro: If the argument has type long double, asinhl is called. Otherwise, if the argument has integer type or the type double, asinh

A null-terminated byte string (NTBS) is a sequence of nonzero bytes followed by a byte with value zero (the terminating null character). Each byte in a byte string encodes one character of some character set. For example, the character array {'\x63','\x61','\x74','\0'} is an NTBS holding the string "cat" in ASCII encoding. Functions Character classification Defined in header <ctype.h> isalnum checks if a character is alphanumeric (function) isalpha checks if a charact

Defined in header <stdlib.h> int mblen( const char* s, size_t n ); Determines the size, in bytes, of the multibyte character whose first byte is pointed to by s. If s is a null pointer, resets the global conversion state and determined whether shift sequences are used. This function is equivalent to the call mbtowc((wchar_t*)0, s, n), except that conversion state of mbtowc is unaffected. Notes Each call to mblen updates the internal global conversion state (a static obje

Defined in header <stdlib.h> void qsort( void *ptr, size_t count, size_t size, int (*comp)(const void *, const void *) ); (1) errno_t qsort_s( void *ptr, rsize_t count, rsize_t size, int (*comp)(const void *, const void *, void *), void *context ); (2) (since C11) 1) Sorts the given array pointed to by ptr in ascending order. The array contains count elements of size bytes. Function pointed to by comp is used for object c

Defined in header <wctype.h> int iswdigit( wint_t ch ); (since C95) Checks if the given wide character corresponds (if narrowed) to one of the ten decimal digit characters 0123456789. Parameters ch - wide character Return value Non-zero value if the wide character is an numeric character, zero otherwise. Notes iswdigit and iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale. Exa

Syntax ' c-char ' (1) u ' c-char ' (since C11) (2) U ' c-char ' (since C11) (3) L ' c-char ' (4) ' c-char-sequence ' (5) where. c-char is either a character from the basic source character set minus single-quote ('), backslash (\), or the newline character. escape sequence: one of special character escapes \' \" \? \\ \a \b \f \n \r \t \v, hex escapes \x... or octal escapes \... as defined in escape sequences. universal character name, \u... or \U... as

Defined in header <time.h> time_t time( time_t *arg ); Returns the current calendar time encoded as a time_t object, and also stores it in the time_t object pointed to by arg (unless arg is a null pointer). Parameters arg - pointer to a time_t object where the time will be stored, or a null pointer Return value Current calendar time encoded as time_t object on success, (time_t)(-1) on error. If arg is not a null pointer, the return value is also stored in the