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How to determine if a string is a number with C++?
...eturn !s.empty() && it == s.end();
}
Or if you want to do it the C++11 way:
bool is_number(const std::string& s)
{
return !s.empty() && std::find_if(s.begin(),
s.end(), [](unsigned char c) { return !std::isdigit(c); }) == s.end();
}
As pointed out in the comment...
How do I initialize an empty array in C#?
...
@RickO'Shea - C++ is not C#. Stroustrup knows his C++ - not so sure he knows his C# and the .NET GC. Not gonna go into a religious war with you.
– Oded
Feb 9 '17 at 22:16
...
How to pass parameters correctly?
I am a C++ beginner but not a programming beginner.
I'm trying to learn C++(c++11) and it's kinda unclear for me the most important thing: passing parameters.
...
How to compile and run C/C++ in a Unix console/Mac terminal?
How can I compile/run C or C++ in Unix console or a Mac terminal?
16 Answers
16
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How do I install PyCrypto on Windows?
...
If you don't already have a C/C++ development environment installed that is compatible with the Visual Studio binaries distributed by Python.org, then you should stick to installing only pure Python packages or packages for which a Windows binary is avail...
Where to put include statements, header or source?
...
Same question expanding to c++ : what if my struct/class has a field/member of type size_t or std::string?
– andrybak
Nov 15 '13 at 13:32
...
Should one use < or
...bel
jmp loopStartLabel
exitLoopLabel:
I just checked and Microsoft's C++ compiler does not do this optimization, but it does if you do:
for (int i = 10; i >= 0; i--)
So the moral is if you are using Microsoft C++†, and ascending or descending makes no difference, to get a quick loop y...
How to print a int64_t type in C
...
And, if using C++ on Linux, be sure to #define __STDC_FORMAT_MACROS before including inttypes.h.
– csl
Nov 28 '14 at 8:50
...
How to count the number of set bits in a 32-bit integer?
...ed to adjust it to work for a particular language (e.g. using uint32_t for C++ and >>> in Java):
int numberOfSetBits(uint32_t i)
{
// Java: use int, and use >>> instead of >>
// C or C++: use uint32_t
i = i - ((i >> 1) & 0x55555555);
i = (i &...
Why would anyone use set instead of unordered_set?
C++0x is introducing unordered_set which is available in boost and many other places. What I understand is that unordered_set is hash table with O(1) lookup complexity. On the other hand, set is nothing but a tree with log(n) lookup complexity. Why on earth would anyone use set instead ...