String termination - char c=0 vs char c='\0

Question

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?

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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.

Answer 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.

Answer 2

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.

Answer 3

'\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.