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This article mainly introduces the relevant knowledge of "is there character types in go language?". The editor shows you the operation process through actual cases. The operation method is simple, fast and practical. I hope this article "is there character types in go language" can help you solve the problem.

There are two character types in the Go language:

One is the uint8 type, or byte type, which represents a character of the ASCII code.

The other is the rune type, which represents a UTF-8 character, and the rune type is needed when you need to deal with Chinese, Japanese, or other compound characters. The rune type is equivalent to the int32 type.

The byte type is an alias for uint8, and there is no problem with traditional ASCII-encoded characters that occupy only 1 byte, such as var ch byte ='A character, which is enclosed in single quotation marks.

In the ASCII code table, the value of An is 65 and 41 in hexadecimal representation, so the following is equivalent:

Var ch byte = 65 or var ch byte ='\ x41'/ / (\ x is always followed by a hexadecimal number of length 2)

Another possible way to write is to\ followed by an octal number of length 3, for example,\ 377.

The Go language also supports Unicode (UTF-8), so characters are also called Unicode code points or runes, and are represented in memory using int. In documents, the format U+hhhh is commonly used, where h represents a hexadecimal number.

When writing Unicode characters, you need to prefix the hexadecimal number with\ u or\ U. Because Unicode takes up at least 2 bytes, we use the int16 or int type to represent it. If you need to use 4 bytes, use the\ u prefix, and if you need to use 8 bytes, use the\ U prefix.

Var ch int ='\ u0041'var ch3 int ='\ u03B2'var ch4 int ='\ U00101234'fmt.Printf ("% d -% d -% d\ n", ch, ch3, ch4) / / integerfmt.Printf ("% c -% c -% c\ n", ch, ch3, ch4) / / characterfmt.Printf ("% X -% X\ n", ch, ch3, ch4) / / UTF-8 bytesfmt.Printf ("% U -% U", ch, ch3) Ch4) / / UTF-8 code point

Output:

65-946-1053236A-β-R41-3B2-101234U+0041-U+03B2-Utility 101234

The format specifier% c is used to represent a character, and when used with a character,% v or% d outputs an integer representing that character, and% U outputs a string in U+hhhh format.

There are some functions built into the Unicode package to test characters, and the return value of these functions is a Boolean value, as shown below (where ch stands for characters):

Determine whether it is a letter or not: unicode.IsLetter (ch)

Determine whether it is a number: unicode.IsDigit (ch)

Determine whether it is a blank symbol: unicode.IsSpace (ch)

This is the end of the introduction to "are there any character types in the go language?" Thank you for your reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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