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This article introduces the relevant knowledge of "what are the types of Swift literals". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Guided Swift is an open source programming language that supports multiple programming paradigms and compilations.

A literal quantity is a value such as a specific number, string, or Boolean value that can directly indicate its own type and assign a value to a variable. For example, in the following:

Let aNumber = 3 / / Integer literals let aString = "Hello" / / string literals let aBool = true / / Boolean literals

Integer literal quantity

The integer literal can be a decimal, binary, octal, or hexadecimal constant. The binary prefix is 0b, the octal prefix is 0o, the hexadecimal prefix is 0x, and the decimal has no prefix:

Here are some examples of integer literals:

Let decimalInteger = 17 / / 17-decimal representation let binaryInteger = 0b10001 / / 17-binary representation let octalInteger = 0o21 / / 17-octal representation let hexadecimalInteger = 0x11 / / 17-hexadecimal representation

Floating point literal quantity

Floating-point literals have integer parts, decimal points, decimal parts and exponential parts.

Unless otherwise specified, the default derivation type for floating-point literals is Double in the Swift standard library type, which represents 64-bit floating-point numbers.

Floating-point literals are represented by default in decimal (no prefix) or in hexadecimal (with prefix 0x).

A decimal floating-point literal consists of a decimal number string followed by a decimal or exponential part (or both). The decimal part consists of the decimal point. Followed by a decimal number string. The exponential part consists of an uppercase or lowercase e prefixed by a string of decimal numbers that represent the number before e times the power of 10. For example, 125 means 1.25 to 10 ^ 2, which is 125.0; similarly, 1.25e-2 means 1.25 to 10 ^-2, which is 0.0125.

The hexadecimal floating-point literal consists of the prefix 0x followed by the optional hexadecimal decimal part and the hexadecimal index part. The hexadecimal decimal part consists of a string of hexadecimal numbers followed by a decimal point. The exponential part consists of an uppercase or lowercase p prefixed by a string of decimal numbers that represent the number before p multiplied by the power of 2. For example, 0xFp2 means 15 / 2 ^ 2, which is 60; similarly, 0xFp-2 means 15 / 2 ^-2, which is 3.75.

Negative floating-point literals consist of the unary operator minus sign-and floating-point literals, such as-42.5.

Floating-point literals allow the use of underscores _ to enhance the readability of numbers, and underscores are ignored by the system, so the value of the literal is not affected. Similarly, you can add 0 to the number without affecting the literal value.

Here are some examples of floating-point literals:

Let decimalDouble = 12.1875 / / Decimal floating point literals let exponentDouble = 12.1875 / / Decimal floating point literals let hexadecimalDouble = 0xC.3p0 / / hexadecimal floating point literals

String literal quantity

A string literal consists of a string of characters enclosed in double quotes in the following form:

"characters"

String literals cannot contain unescaped double quotes ("), unescaped backslashes (\), carriage returns, or newline characters.

The following is a simple example of the literal amount of a string:

Import Cocoalet stringL = "Hello\ tWorld\ n\ nLinux should learn this from the official website:\ 'https://www.linuxprobe.com\'"print(stringL)

The execution results of the above procedures are as follows:

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