Defined in header <wctype.h> wint_t towlower( wint_t wc ); (since C95) Converts the given wide character to lowercase, if possible. Parameters wc - wide character to be converted Return value Lowercase version of wc or unmodified wc if no lowercase version is listed in the current C locale. Notes Only 1:1 character mapping can be performed by this function, e.g. the Greek uppercase letter 'Σ' has two lowercase forms, depending on the position in a word: 'σ'

Defined in header <stdatomic.h> A kill_dependency(A y); (since C11) Informs the compiler that the dependency tree started by an memory_order_consume atomic load operation does not extend past the return value of kill_dependency; that is, the argument does not carry a dependency into the return value. The function is implemented as a macro. A is the type of y. Parameters y - the expression whose return value is to be removed from a dependency tree Return value

Queries the alignment requirement of its operand type. Syntax _Alignof( type-name ) (since C11) This operator is typically used through the convenience macro alignof, which is provided in the header stdalign.h. Explanation Returns the alignment requirement of the type named by type-name. If type-name is an array type, the result is the alignment requirement of the array element type. The type-name cannot be function type or an incomplete type. The result is an integer constant of

If the macro constant __STDC_NO_COMPLEX__ is defined by the implementation, the complex types, the header <complex.h> and all of the names listed here are not provided. (since C11) The C programming language, as of C99, supports complex number math with the three built-in types double _Complex, float _Complex, and long double _Complex (see _Complex). When the header <complex.h> is included, the three complex number types are also accessible as double complex, float complex, long

Defined in header <math.h> float log1pf( float arg ); (1) (since C99) double log1p( double arg ); (2) (since C99) long double log1pl( long double arg ); (3) (since C99) Defined in header <tgmath.h> #define log1p( arg ) (4) (since C99) 1-3) Computes the natural (base e) logarithm of 1+arg. This function is more precise than the expression log(1+arg) if arg is close to zero. 4) Type-generic macro: If arg has type long double, log1pl

If the macro constant __STDC_NO_THREADS__(C11) is defined by the compiler, the header <threads.h> and all of the names listed here are not provided. Threads Defined in header <threads.h> thrd_t implementation-defined complete object type identifying a thread thrd_create (C11) creates a thread (function) thrd_equal (C11) checks if two identifiers refer to the same thread (function) thrd_current (C11) obtains the current thread identifier (function) t

Usage break statement: as the declaration of the statement

Every object in C exists, has a constant address, retains its last-stored value (except when the value is indeterminate), and, for VLA, retains its size (since C99) over a portion of program execution known as this object's lifetime. For the objects that are declared with automatic, static, and thread storage duration, lifetime equals their storage duration (note the difference between non-VLA and VLA automatic storage duration). For the objects with allocated storage duration, the lifetime beg

Defined in header <time.h> struct tm; Structure holding a calendar date and time broken down into its components. Member objects int tm_sec seconds after the minute – [0, 61](until C99) / [0, 60] (since C99)[note 1] int tm_min minutes after the hour – [0, 59] int tm_hour hours since midnight – [0, 23] int tm_mday day of the month – [1, 31] int tm_mon months since January – [0, 11] int tm_year years since 1900 int tm_wday days since Sunday – [0,

Usage while loop: as the declaration of the loop do-while loop: as the declaration of the terminating condition of the loop