包含任何 Unicode 转义序列。 ### 8.5 数值类型 精确地，数值类型拥有 18437736874454810627（即， $ 2^{64}-2^{53}+3 $ ）个值，表示为 IEEE-754 格式 64 位双精度数值（IEEE 二进制浮点数算术中描述了它），除了 IEEE 标准中的 9007199254740990（即， $ 2^{53}-2 $ ）个明显的“非数字”值；在 ECMAScript

has the following floating point types: • f16 – IEEE-754–2008 binary16 • f32 – IEEE-754–2008 binary32 • f64 – IEEE-754–2008 binary64 • f128 – IEEE-754–2008 binary128 • c_longdouble – matches long double

The common operators + - * / < <= == != > >= are defined for floats and follow the IEEE-754 standard. Automatic type conversion in expressions with different kinds of floating point types

The single type occupies 4 bytes of storage space, and its memory structure is the same as the IEEE-754 single type. This type is the only type which is guaranteed to be available on all platforms that The double type occupies 8 bytes of storage space, and its memory structure is the same as the IEEE-754 double type. The memory format of the double format looks like like what is shown in figure (8

counter value (64-bit long)| |decimal|Variable-precision decimal| |double|64-bit IEEE-754 floating point| |float|32-bit IEEE-754 floating point| |int|32-bit signed integer| |text|UTF-8 encoded string| |timestamp|Date

'iso8601' format (value) class fields.Float(default=None, attribute=None) A double as IEEE-754 double precision. ex : 3.141592653589793 3.1415926535897933e-06 3.141592653589793e+24 nan inf -inf

value are both float64 values. In memory, all floating-point numeric values in Go are stored in IEEE-754 format. A boolean value represents a truth. There are only two possible boolean values in memory 0x100000000000000000, so the literal is not representable as values of any basic integer types. - The maximum IEEE-754 float32 value which can be represented accurately is 3.40282346638528859811704183484516925440e+38 38, so 3.5e38 is not representable as values of any float32 and complex64 types. - The max IEEE-754 float64 value which can be represented accurately is 1.797693134862315708145274237317043567981e+308

value are both float64 values. In memory, all floating-point numeric values in Go are stored in IEEE-754 format. A boolean value represents a truth. There are only two possible boolean values in memory Notes: • Because no values of the basic integer types provided in Go can hold 0x1000 - The maximum IEEE-754 float32 value which can be represented accurately is 3.40282346638528859811704183484516925440e+38 38, so 3.5e38 is not representable as values of any float32 and complex64 types. - The max IEEE-754 float64 value which can be represented accurately is 1.797693134862315708145274237317043567981e+308

value are both float64 values. In memory, all floating-point numeric values in Go are stored in IEEE-754 format ☐. A boolean value represents a truth. There are only two possible boolean values in memory Notes: - Because no values of the basic integer types provided in Go can hold 0x1000 - The maximum IEEE-754 float32 value which can be represented accurately is 3.40282346638528859811704183484516925440e+38 38, so 3.5e38 is not representable as values of any float32 and complex64 types. - The max IEEE-754 float64 value which can be represented accurately is 1.797693134862315708145274237317043567981e+308

float32 float32 float32 is the set of all IEEE-754 32-bit floating-point numbers. ## type float64 type float64 float64 float64 is the set of all IEEE-754 64-bit floating-point numbers. ## type int