standard-library

I have two postcodes char* that I want to compare, ignoring case. Is there a function to do this? Or do I have to loop through each use the tolower function and then do the comparison? Any idea how this function will react with numbers in the string Thanks Fred Foo There is no function that does this in the C standard. Unix systems that comply with POSIX are required to have strcasecmp in the header strings.h ; Microsoft systems have stricmp . To be on the portable side, write your own: int strcicmp(char const *a, char const *b) { for (;; a++, b++) { int d = tolower((unsigned char)*a) -

When c has the / operator to divide two numbers, what is the purpose of having the div() library function ? Is there any scenario where / can't be used but div() can? From the C99 Rationale document: (7.20.6.2 The div, ldiv, and lldiv functions) Because C89 had implementation-defined semantics for division of signed integers when negative operands were involved, div and ldiv, and lldiv in C99, were invented to provide well-specified semantics for signed integer division and remainder operations. The semantics were adopted to be the same as in Fortran. Since these functions return both the

I know most compilers allow both: #include <stdio.h> //and #include <cstdio> But someone argued that <stdio.h> is not actually C++ standard. is that true? stdio.h is standard, but deprecated. Always prefer cstdio in C++. [n3290: C.3.1/1]: For compatibility with the Standard C library, the C++ standard library provides the 18 C headers (D.5), but their use is deprecated in C++. [n3290: D.5/3]: [ Example: The header <cstdlib> assuredly provides its declarations and definitions within the namespace std . It may also provide these names within the global namespace. The header <stdlib.h> assuredly

I've read that many pseudo-random number generators require many samples in ordered to be "warmed up". Is that the case when using std::random_device to seed std::mt19937, or can we expect that it's ready after construction? The code in question: #include <random> std::random_device rd; std::mt19937 gen(rd()); bames53 Mersenne Twister is a shift-register based pRNG (pseudo-random number generator) and is therefore subject to bad seeds with long runs of 0s or 1s that lead to relatively predictable results until the internal state is mixed up enough. However the constructor which takes a single

Looking for a better way to get a machines current external IP #... Below works, but would rather not rely on an outside site to gather the information ... I am restricted to using standard Python 2.5.1 libraries bundled with Mac OS X 10.5.x import os import urllib2 def check_in(): fqn = os.uname()[1] ext_ip = urllib2.urlopen('http://whatismyip.org').read() print ("Asset: %s " % fqn, "Checking in from IP#: %s " % ext_ip) Sunny Milenov If you are behind a router which obtains the external IP, I'm afraid you have no other option but to use external service like you do. If the router itself has

I wanted to see how a math.py function was implemented, but when I opened the file in PyCharm I found that all the functions are empty and there is a simple pass . For example: def ceil(x): # real signature unknown; restored from __doc__ """ ceil(x) Return the ceiling of x as a float. This is the smallest integral value >= x. """ pass I guess it is because the functions being used are actually from the C standard library. How does it work? PyCharm is lying to you. The source code you're looking at is a fake that PyCharm has created. PyCharm knows what functions should be there, and it can