NULL is not guaranteed to be 0 -- its exact value is architecture-dependent. Most major architectures define it to (void*)0. '\0' will always equal 0, because that is how byte 0 is encoded in a character literal. I don't remember whether C compilers are required to use ASCII -- if not, '0' might not always equal 48.

2012年11月18日 · @Pavel: What a .bat file does is: read instruction, at the end of file terminate. If you run %0: Process 1: starts, run %0 (thus create process 2); then die Process 2: starts, run %0 (thus create process 3); then die [...] you alway have …

2013年12月26日 · 0.0.0.0 has a couple of different meanings, but in this context, when a server is told to listen on 0.0.0.0 that means "listen on every available network interface". The loopback adapter with IP address 127.0.0.1 from the perspective of the server process looks just like any other network adapter on the machine, so a server told to listen on 0 ...

2014年12月22日 · 0L is a long integer value with all the bits set to zero - that's generally the definition of 0. The ~ means to invert all the bits, which leaves you with a long integer with all the bits set to one. In two's complement arithmetic (which is almost universal) a signed value with all bits set to one is -1.

2011年8月12日 · LL designates a literal as a long long and UL designates one as unsigned long and 0x0 is hexadecimal for 0. So 0LL and 0x0UL are an equivalent number but different datatypes; the former is a long long and the latter is an unsigned long. There are many of these specifiers: 1F // float 1L // long 1ull // unsigned long long 1.0 // double

2014年6月14日 · The @ symbol represents a parameter. The word after it, or in this case the number after it, is the name of the parameter.

2016年1月27日 · For example, int i, j=0; i=j; effectively dereferences j; j is an address constant, and the assignment concerns the value stored there, j's value, so that the assignment amounts to i=0. Other languages, like Algol68, were more precise: one would effectively write int i; int *pi = i; , which makes complete sense (pi now points to i).

2015年12月31日 · Good question. Just checked redis and it does work on 127.0.0.1. I guess it's because it doesn't use http, but it's special protocol RESP. Will update the question now. To the second part, this is not browser issue, Fiddler (for IIS) and Visual Studio Server Explorer (for azure emulator) both can't connect to 127.0.0.1. –

2018年1月13日 · Assuming the assignment is to exclude all strings that consist entirely of zero's, at most one decimal point and possibly leading and/or trailing spaces, here is one way to do it, which requires only standard string functions (and therefore should be faster than any regular-expression solution).

2009年8月18日 · void(0) is needed in many cases; "#" is a hack that brings with it a whole host of problems (it would not work in the app I'm writing, that brought me to this page). – felwithe Commented Mar 24, 2015 at 3:46