Defined in header <locale.h> struct lconv; The struct lconv contains numeric and monetary formatting rules as defined by a C locale. Objects of this struct may be obtained with localeconv. The members of lconv are values of type char and of type char*. Each char* member except decimal_point may be pointing at a null character (that is, at an empty C-string). The members of type char are all non-negative numbers, any of which may be CHAR_MAX if the corresponding value is not

Defined in header <stdio.h> (1) FILE *fopen( const char *filename, const char *mode ); (until C99) FILE *fopen( const char *restrict filename, const char *restrict mode ); (since C99) errno_t fopen_s(FILE *restrict *restrict streamptr, const char *restrict filename, const char *restrict mode); (2) (since C11) 1) Opens a file indicated by filename and returns a pointer to the file stream associated with that file. mode is used to

Defined in header <threads.h> int cnd_timedwait( cnd_t* restrict cond, mtx_t* restrict mutex, const struct timespec* restrict time_point ); (since C11) Atomically unlocks the mutex pointed to by mutex and blocks on the condition variable pointed to by cond until the thread is signalled by cnd_signal or cnd_broadcast, or until the TIME_UTC based time point pointed to by time_point has been reached. The mutex is locked again before the function returns. The

Defined in header <wchar.h> (1) wchar_t* wcstok( wchar_t* str, const wchar_t* delim, wchar_t **ptr ); (since C95) (until C99) wchar_t *wcstok(wchar_t * restrict str, const wchar_t * restrict delim, wchar_t **restrict ptr); (since C99) wchar_t *wcstok_s( wchar_t *restrict str, rsize_t *restrict strmax, const wchar_t *restrict delim, wchar_t **restrict ptr); (2) (since C11) 1) Finds the next token in a null-terminated wide strin

Defined in header <stdlib.h> void exit( int exit_code ); (until C11) _Noreturn void exit( int exit_code ); (since C11) Causes normal program termination to occur. Several cleanup steps are performed: functions passed to atexit are called, in reverse order of registration all C streams are flushed and closed files created by tmpfile are removed control is returned to the host environment. If exit_code is zero or EXIT_SUCCESS, an implementation-defined status, in

Performs explicit type conversion. Syntax ( type-name ) expression where. type-name - either the type void or any scalar type expression - any expression of scalar type (unless type-name is void, in which case it can be anything) Explanation If type-name is void, then expression is evaluated for its side-effects and its returned value is discarded, same as when expression is used on its own, as an expression statement. Otherwise, if type-name is exactly the type of e

Defined in header <math.h> float erfcf( float arg ); (1) (since C99) double erfc( double arg ); (2) (since C99) long double erfcl( long double arg ); (3) (since C99) Defined in header <tgmath.h> #define erfc( arg ) (4) (since C99) 1-3) Computes the complementary error function of arg, that is 1.0-erf(arg), but without loss of precision for large arg. 4) Type-generic macro: If arg has type long double, erfcl is called. Otherwise, i

Defined in header <stdlib.h> (1) size_t wcstombs( char *dst, const wchar_t *src, size_t len ); (until C99) size_t wcstombs( char *restrict dst, const wchar_t *restrict src, size_t len ); (since C99) errno_t wcstombs_s( size_t *restrict retval, char *restrict dst, rsize_t dstsz, const wchar_t *restrict src, rsize_t len ); (2) (since C11) 1) Converts a sequence of wide characters from the array whose first element is pointed

Defined in header <wchar.h> float wcstof( const wchar_t* str, wchar_t** str_end ); (since C99) double wcstod( const wchar_t* str, wchar_t** str_end ); (since C95) long double wcstold( const wchar_t* str, wchar_t** str_end ); (since C99) Interprets a floating point value in a wide string pointed to by str. Function discards any whitespace characters (as determined by std::isspace()) until first non-whitespace character is found. Then it takes as many c

Defined in header <math.h> int ilogbf( float arg ); (1) (since C99) int ilogb( double arg ); (2) (since C99) int ilogbl( long double arg ); (3) (since C99) Defined in header <tgmath.h> #define ilogb( arg ) (4) (since C99) Defined in header <math.h> #define FP_ILOGB0 /*implementation-defined*/ (5) (since C99) #define FP_ILOGBNAN /*implementation-defined*/ (6) (since C99) 1-3) Extracts the value of the unbiased exponent