The real types are the integer types and the real floating-point types.
The following types are guaranteed to be real; some are variations or aliases of others, and other, non-standard types may exist:
_Boolatomic_bool atomic_char atomic_char16_t atomic_char32_t atomic_int atomic_int_ fast16_t atomic_int_ fast32_t atomic_int_ fast64_t atomic_int_ fast8_t atomic_int_ least16_t atomic_int_ least32_t atomic_int_ least64_t atomic_int_ least8_t atomic_intmax_t atomic_intptr_t atomic_llong atomic_long atomic_ptrdiff_t atomic_schar atomic_short atomic_size_t atomic_uchar atomic_uint atomic_uint_ fast16_t atomic_uint_ fast32_t atomic_uint_ fast64_t atomic_uint_ fast8_t atomic_uint_ least16_t atomic_uint_ least32_t atomic_uint_ least64_t atomic_uint_ least8_t atomic_uintmax_t atomic_uintptr_t atomic_ullong atomic_ulong atomic_ushort boolcharclock_tdoubledouble_terrno_tfloatfloat_tintint16_tint32_tint64_tint8_tint_fast16_t int_fast32_t int_fast64_t int_fast8_t int_least16_t int_least32_t int_least64_t int_least8_t intmax_tintptr_tlonglong doublelong longptrdiff_trsize_tshortsig_atomic_t signed charsize_ttime_tuint16_tuint32_tuint64_tuint8_tuint_fast16_t uint_fast32_t uint_fast64_t uint_fast8_t uint_least16_t uint_least32_t uint_least64_t uint_least8_t uintmax_tuintptr_tunsignedunsigned charunsigned longunsigned long longunsigned shortwchar_twint_t
