问题
When terminating a string, it seems to me that logically char c=0 is equivalent to char c=\'\\0\', since the \"null\" (ASCII 0) byte is 0, but usually people tend to do \'\\0\' instead. Is this purely out of preference or should it be a better \"practice\"?
What is the preferred choice?
EDIT: K&R says: \"The character constant \'\\0\' represents the character with value zero, the null character. \'\\0\' is often written instead of 0 to emphasize the character nature of some expression, but the numeric value is just 0.
回答1:
http://en.wikipedia.org/wiki/Ascii#ASCII_control_code_chart
Binary Oct Dec Hex Abbr Unicode Control char C Escape code Name
0000000 000 0 00 NUL ␀ ^@ \0 Null character
There's no difference, but the more idiomatic one is '\0'.
Putting it down as char c = 0; could mean that you intend to use it as a number (e.g. a counter). '\0' is unambiguous.
回答2:
'\0' is just an ASCII character. The same as 'A', or '0' or '\n'
If you write char c = '\0', it's the same aschar c = 0;
If you write char c = 'A', it's the same as char c = 65
It's just a character representation and it's a good practice to write it, when you really mean the NULL byte of string. Since char is in C one byte (integral type), it doesn't have any special meaning.
回答3:
Preferred choice is that which can give people reading your code an ability to understand how do you use your variable - as a number or as a character. Best practice is to use 0 when you mean you variable as a number and to use '\0' when you mean your variable is a character.
来源：https://stackoverflow.com/questions/16955936/string-termination-char-c-0-vs-char-c-0