Usage thread storage-class specifier.

Defined in header <complex.h> #define _Imaginary_I /* unspecified */ (since C99) The _Imaginary_I macro expands to a value of type const float _Imaginary with the value of the imaginary unit. As with any pure imaginary number support in C, this macro is only defined if the imaginary numbers are supported. A compiler that defines __STDC_IEC_559_COMPLEX__ is not required to support imaginary numbers. POSIX recommends checking if the macro _Imaginary_I is defined to identify

Usage _Noreturn function specifier

Usage static assert declaration

Specifies that the function does not return to its point of invocation. Syntax _Noreturn function_declaration (since C11) Explanation The _Noreturn keyword appears in a function declaration and specifies that the function does not return by executing the return statement or by reaching the end of the function body (it may return by executing longjmp). If the function declared _Noreturn returns, the behavior is undefined. A compiler diagnostic is recommended if this can be detected

Usage imaginary floating type specifier

Usage atomic type specifier and qualifier

Defined in header <complex.h> #define _Complex_I /* unspecified */ (since C99) The _Complex_I macro expands to a value of type const float _Complex with the value of the imaginary unit. Notes This macro may be used when I is not available, such as when it has been undefined by the application. Unlike _Imaginary_I and CMPLX, use of this macro to construct a complex number may lose the sign of zero on the imaginary component. Example #include <stdio.h> #include

Usage Type-generic expression

Usage boolean type: as the declaration of the type