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- What is the difference between 0. 0. 0. 0, 127. 0. 0. 1 and localhost?
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
- c - why is *pp[0] equal to **pp - Stack Overflow
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)
- factorial - Why does 0! = 1? - Mathematics Stack Exchange
$\begingroup$ The theorem that $\binom{n}{k} = \frac{n!}{k!(n-k)!}$ already assumes $0!$ is defined to be $1$ Otherwise this would be restricted to $0 <k < n$ A reason that we do define $0!$ to be $1$ is so that we can cover those edge cases with the same formula, instead of having to treat them separately
- What is the difference between NULL, \0 and 0? - Stack Overflow
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
- c - What do 0LL or 0x0UL mean? - Stack Overflow
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
- What is IPV6 for localhost and 0. 0. 0. 0? - Stack Overflow
The 0 0 0 0 and :: addresses are reserved to mean "any address" So, for example a program that is providing a web service may bind to 0 0 0 0 port 80 to accept HTTP connections via any of the host's IPv4 addresses These addresses are not valid as a source or destination address for an IP packet
- What is %0|%0 and how does it work? - Stack Overflow
@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 at most 2 process running because the creator will die
- c++ - What does (~0L) mean? - Stack Overflow
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
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