The role of \ in c++

The functions of backslash (\) in C include: escaping characters, representing special characters or changing the meaning of characters. Separate sequences, allowing constants to span multiple lines. Escape characters for wide string literals. Ordinary characters in raw string literals. Comment separators (such as / and **/). Directory separator (such as /).

The role of backslash (\) in C

The backslash (\) in C is usually Used for the following purposes:

Escape Character

When a backslash appears before a sequence of characters, it treats that character as an escape character, thus changing its meaning. For example:

• '\n' represents a newline character
• '\t' represents a tab character
• '\"' represents a double quote

Delimited sequences

The backslash can also be used as a line separator, allowing one character or string constant to be spanned on multiple lines. For example:

<code class="cpp">string my_string = "This is a very long string that\
spans multiple lines.";</code>

##.

#Wide string literals

Wide string literals were introduced in C 11. The backslash can be used as an escape character for wide string literals, for example:

'\u0041' represents the uppercase letter "A" (Unicode code point is 0x0041)
• '\U00000041' represents the same uppercase letter "A" as '\u0041' (but using the extended Unicode code Dot notation)

Raw string literals

In C 11 backslashes were also introduced in raw string literals. Treated as normal characters, not escaped characters. Raw string literals start with an 'R' prefix, for example:

<code class="cpp">string my_string = R"string(This is a raw string without\
any special characters.)string";</code>

Other uses

Also, backslashes The bar is also used for some other purposes, such as:

## Comment separator:
• / represents a line comment, while **/ represents a block comment. Directory separator: / represents a directory separator, used in Windows and Unix-style file systems
• .

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