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

Defined in header <ctype.h> int tolower( int ch ); Converts the given character to lowercase according to the character conversion rules defined by the currently installed C locale. In the default "C" locale, the following uppercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ are replaced with respective lowercase letters abcdefghijklmnopqrstuvwxyz. Parameters ch - character to be converted. If the value of ch is not representable as unsigned char and does not equal EOF, the

Usage declaration of a compound type

A struct is a type consisting of a sequence of members whose storage is allocated in an ordered sequence (as opposed to union, which is a type consisting of a sequence of members whose storage overlaps). The type specifier for a struct is identical to the union type specifier except for the keyword used: Syntax struct name(optional) { struct-declaration-list } (1) struct name (2) 1) Struct definition: introduces the new type struct name and defines its meaning 2) If used o

Defined in header <math.h> float nanf( const char* arg ); (since C99) double nan( const char* arg ); (since C99) long double nanl( const char* arg ); (since C99) Converts the implementation-defined character string arg into the corresponding quiet NaN value, as if by calling strtod, strtof, or strtold, respectively, as follows: The call nan("string") is equivalent to the call strtod("NAN(string)", (char**)NULL);. The call nan("") is equivalent to the

Usage long type modifier

Defined in header <wchar.h> int wcscmp( const wchar_t *lhs, const wchar_t *rhs ); (since C95) Compares two null-terminated wide strings lexicographically. The sign of the result is the sign of the difference between the values of the first pair of wide characters that differ in the strings being compared. The behavior is undefined if lhs or rhs are not pointers to null-terminated wide strings. Parameters lhs, rhs - pointers to the null-terminated wide strings to com

Defined in header <stdatomic.h> _Bool atomic_compare_exchange_strong( volatile A* obj, C* expected, C desired ); (1) (since C11) _Bool atomic_compare_exchange_weak( volatile A *obj, C* expected, C desired ); (2) (since C11) _Bool atomic_compare_exchange_strong_explicit( volatile A* obj, C* expected, C desired,

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

If the macro constant __STDC_NO_ATOMICS__(C11) is defined by the compiler, the header <stdatomic.h>, the keyword _Atomic, and all of the names listed here are not provided. Types Defined in header <stdatomic.h> memory_order (C11) defines memory ordering constraints (enum) atomic_flag (C11) lock-free atomic boolean flag (struct) Macros Defined in header <stdatomic.h> ATOMIC_BOOL_LOCK_FREEATOMIC_CHAR_LOCK_FREEATOMIC_CHAR16_T_LOCK_FREEATOMIC_CHAR32_