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Can't use modulus on doubles?
...The % operator is for integers. You're looking for the fmod() function.
#include <cmath>
int main()
{
double x = 6.3;
double y = 2.0;
double z = std::fmod(x,y);
}
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impr...
Foreign keys in mongo?
...
Edit:
In mongoid you will write your scheme like this:
class Student
include Mongoid::Document
field :name
embeds_many :addresses
embeds_many :scores
end
class Address
include Mongoid::Document
field :address
field :city
field :state
field :postalCode
e...
What are the options for storing hierarchical data in a relational database? [closed]
...
Active
Oldest
Votes
...
Generating random numbers in Objective-C
...It uses a superior algorithm to rand. You don't even need to set a seed.
#include <stdlib.h>
// ...
// ...
int r = arc4random_uniform(74);
The arc4random man page:
NAME
arc4random, arc4random_stir, arc4random_addrandom -- arc4 random number generator
LIBRARY
Standard C Library ...
Generating a list of which files changed between hg versions
...3
hg status --rev 1:4 would return (1,2,3,4),
i.e. anything between and including the endpoints, according to the local, numerical rev. This might (and most probably will) return different results in other - though related - repositories!
hg status --rev 1::4 would return (1,2,4),
i.e. the endpo...
What does @@variable mean in Ruby?
...pect}" # nil
puts "Hexagon.sides: #{Hexagon.sides.inspect}" # 6
I included the Square example (which outputs nil) to demonstrate that this may not behave 100% as you expect; the article I linked above has plenty of additional information on the subject.
Also keep in mind that, as with most...
Split long commands in multiple lines through Windows batch file
...ly removed. So, if there should be a space where you're breaking the line, include a space. (More on that below.)
Example:
copy file1.txt file2.txt
would be written as:
copy file1.txt^
file2.txt
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How can I search sub-folders using glob.glob module?
...s = path.glob('*/*.txt')
txt_files_all_recursively = path.rglob('*.txt') # including the current dir
Both methods return iterators (you can get paths one by one).
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How to convert std::string to LPCWSTR in C++ (Unicode)
...e byte, i.e. ASCII or ISO-8859-1. Anything multi-byte will fail miserably, including UTF-8.
– Mark Ransom
Sep 3 '13 at 16:20
...
Why is “a” != “a” in C?
...("Yes, equal");
}
Use the following code to compare two string values:
#include <string.h>
...
if(strcmp("a", "a") == 0)
{
// Equal
}
Additionally, "a" == "a" may indeed return true, depending on your compiler, which may combine equal strings at compile time into one to save space.
...