C语言 空格的 C 转义序列是什么？
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What's the C escape sequence for blanks?
提问by MW2000
I'm writing a program to count blanks, tabs, and newlines. I remember what the escape sequence for tabs and newlines are, but what about blanks? \b? Or is that backspace?
我正在编写一个程序来计算空格、制表符和换行符。我记得制表符和换行符的转义序列是什么，但是空格呢？\b? 还是那个退格？
回答by GManNickG
You mean "blanks" like in "a b"? That's a space: ' '.
您的意思是“空白”，例如"a b"？那是一个空格：' '。
Here's a list of escape sequencesfor reference.
这里有一个转义序列列表供参考。
回答by caf
If you want to check if a character is whitespace, you can use the isspace()function from <ctype.h>. In the default C locale, it checks for space, tab, form feed, newline, carriage return and vertical tab.
如果要检查字符是否为空格，可以使用isspace()来自<ctype.h>. 在默认的 C 语言环境中，它检查空格、制表符、换页、换行符、回车和垂直制表符。
回答by Elf Machine
Space is simply ' ', in hex it is stored as 20, which is the integer equivalent of 32. For example:
空格很简单' '，在十六进制中它存储为 20，这是 32 的整数等价物。例如：
if (a == ' ')
Checks for integer 32. Likewise:
检查整数 32。同样：
if (a == '\n')
Checks for integer 10 since \nis 0Ain hex, which is the integer 10.
Here are the rest of the most common escape sequences and their hex and integer counterparts:
检查整数 10，因为它\n是0A十六进制的，也就是整数 10。以下是其余最常见的转义序列及其十六进制和整数对应物：
code: │ name: │Hex to integer:
──────│────────────────────────│──────────────
\n │ # Newline │ Hex 0A = 10
\t │ # Horizontal Tab │ Hex 09 = 9
\v │ # Vertical Tab │ Hex 0B = 11
\b │ # Backspace │ Hex 08 = 8
\r │ # Carriage Return │ Hex 0D = 13
\f │ # Form feed │ Hex 0C = 12
\a │ # Audible Alert (bell)│ Hex 07 = 7
\ │ # Backslash │ Hex 5C = 92
\? │ # Question mark │ Hex 3F = 63
\' │ # Single quote │ Hex 27 = 39
\" │ # Double quote │ Hex 22 = 34
' ' │ # Space/Blank │ Hex 20 = 32
回答by Matthew Flaschen
\bis backspace (ASCII 0x8). You don't need an escape for regular space (ASCII 0x20). You can just use ' '.
\b是退格（ASCII 0x8）。您不需要对常规空间（ASCII 0x20）进行转义。你可以只使用' '.
回答by Joseph Paterson
'\b' is backspace, and you don't really need an escape sequence for blanks as ' ' will do just fine.
'\b' 是退格键，你真的不需要空格的转义序列，因为 ' ' 就可以了。
