本文深入介绍了Swift中的数值类型，包括布尔值、整数、浮点数等基本数值类型，以及范围类型、错误处理协议和可选类型。同时探讨了如何使用数值协议编写泛型代码，介绍了特殊用途的数值类型，并提供了全局数值函数的使用方法。
Topics
Logical Values
struct Bool
A value type whose instances are either true or false.
Numeric Values
struct Int
A signed integer value type.
struct Double
A double-precision, floating-point value type.
struct Float
A single-precision, floating-point value type.
Ranges
struct Range
A half-open interval over a comparable type, from a lower bound up to, but not including, an upper bound.
struct ClosedRange
An interval over a comparable type, from a lower bound up to, and including, an upper bound.
Errors
protocol Error
A type representing an error value that can be thrown.
Optionals
enum Optional
A type that represents either a wrapped value or nil, the absence of a value.
Advanced Numerics
Write generic code that works with any numeric type.
Work with fixed-width numeric types of different sizes.
Use these functions with numeric values and other comparable types.
See Also
Values and Collections
Work with text using Unicode-safe strings.
Store and organize data using arrays, dictionaries, sets, and other data structures.
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