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c/compiler support

Variadic function support

Dynamic memory management

Date and time utilities

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c/types/max align t

Fixed width integer types

c/types/limits/FLT ROUNDS

c/types/limits/FLT EVAL METHOD

c/numeric/math/INFINITY

c/numeric/math/NAN

FLT_SNANDBL_SNANLDBL_SNAN

c/program/sig atomic t

integral promotions

Each of the *_WIDTH macros (other than BOOL_WIDTH), BITINT_MAXWIDTH,(since C23) CHAR_BIT and MB_LEN_MAX expands to an implementation-defined value. The allowed minimum values are listed below, where each group of macros

cpp/numeric/math/INFINITY

cpp/numeric/math/NAN

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