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The following data type has been defined via `typedef`

.

`__complex128`

:`__float128`

-based complex number

The following macros are defined, which give the numeric limits of the
`__float128`

data type.

`FLT128_MAX`

: largest finite number`FLT128_MIN`

: smallest positive number with full precision`FLT128_EPSILON`

: difference between 1 and the next largerrepresentable number

`FLT128_DENORM_MIN`

: smallest positive denormalized number`FLT128_MANT_DIG`

: number of digits in the mantissa (bit precision)`FLT128_MIN_EXP`

: maximal negative exponent`FLT128_MAX_EXP`

: maximal positive exponent`FLT128_DIG`

: number of decimal digits in the mantissa`FLT128_MIN_10_EXP`

: maximal negative decimal exponent`FLT128_MAX_10_EXP`

: maximal positive decimal exponent

The following mathematical constants of type `__float128`

are defined.

`M_Eq`

: the constant e (Euler’s number)`M_LOG2Eq`

: binary logarithm of 2`M_LOG10Eq`

: common, decimal logarithm of 2`M_LN2q`

: natural logarithm of 2`M_LN10q`

: natural logarithm of 10`M_PIq`

: pi`M_PI_2q`

: pi divided by two`M_PI_4q`

: pi divided by four`M_1_PIq`

: one over pi`M_2_PIq`

: one over two pi`M_2_SQRTPIq`

: two over square root of pi`M_SQRT2q`

: square root of 2`M_SQRT1_2q`

: one over square root of 2