A real type defines a set of Numbers that can be represented with floating-point notation.

实数类型定义了一组可以以浮点记号描述的数。

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IEEE 754 represents floating point Numbers as base 2 decimal Numbers in scientific notation.

IEEE 754用科学记数法以底数为2的小数来表示浮点数。

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Floating-Point literals may also be represented using exponential notation: a real number followed by the letter e(or E), followed by an optional plus or minus sign, followed by an integer exponent.

此外，还可以使用指数记数法表示浮点型直接量，即实数后跟随字母e或E，后面加上正负号，其后再加一个整型指数。

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