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From cppreference.com

Common mathematical functions
Floating-point environment (C99)
Pseudo-random number generation
Complex number arithmetic (C99)
Type-generic math (C99)
Bit manipulation (C23)
Checked integer arithmetic (C23)

Functions
feclearexcept (C99)
fetestexcept (C99)
feraiseexcept (C99)
fegetexceptflagfesetexceptflag (C99)(C99)
fegetroundfesetround (C99)(C99)
fegetenvfesetenv (C99)
feholdexcept (C99)
feupdateenv (C99)
Macro constants
FE_ALL_EXCEPTFE_DIVBYZEROFE_INEXACTFE_INVALIDFE_OVERFLOWFE_UNDERFLOW (C99)
FE_DOWNWARDFE_TONEARESTFE_TOWARDZEROFE_UPWARD (C99)
FE_DFL_ENV (C99)