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Random date in C#
...eTime RandomDay()
{
DateTime start = new DateTime(1995, 1, 1);
int range = (DateTime.Today - start).Days;
return start.AddDays(gen.Next(range));
}
For better performance if this will be called repeatedly, create the start and gen (and maybe even range) variables outside of t...
Loop through each row of a range in Excel
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Dim a As Range, b As Range
Set a = Selection
For Each b In a.Rows
MsgBox b.Address
Next
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fatal error \"vector iterator + offset out of range\" \"standard C++ ...
fatal error "vector iterator + offset out of range" "standard C++ libraries out of range"代码如下：#include <iostream> #include <iterator> 使用back_inserter #include <algorithm> #include <vector> usin...代码如下：
#include <iostream>
#include <iterator>//使用back_inserter ...
Passing a std::array of unknown size to a function
... few steps to do cleanly. First, write a template class that represents a range of contiguous values. Then forward a template version that knows how big the array is to the Impl version that takes this contiguous range.
Finally, implement the contig_range version. Note that for( int& x: rang...
What is the most efficient way of finding all the factors of a number in Python?
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return set(reduce(list.__add__,
([i, n//i] for i in range(1, int(n**0.5) + 1) if n % i == 0)))
This will return all of the factors, very quickly, of a number n.
Why square root as the upper limit?
sqrt(x) * sqrt(x) = x. So if the two factors are the same, they're both the ...
Lambda function in list comprehensions
... To make it equivalent to the first you need:
[(lambda x: x*x)(x) for x in range(10)]
Or better yet:
[x*x for x in range(10)]
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Sequence-zip function for c++11?
With the new range-based for loop we can write code like
13 Answers
13
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Correct way to populate an Array with a Range in Ruby
I am working through a book which gives examples of Ranges being converted to equivalent arrays using their "to_a" methods
...
How to generate a random integer number from within a range
...cally wrong. Returning rand() % N does not uniformly give a number in the range [0, N) unless N divides the length of the interval into which rand() returns (i.e. is a power of 2). Furthermore, one has no idea whether the moduli of rand() are independent: it's possible that they go 0, 1, 2, ..., w...
Python: how to print range a-z?
...work ;-) - no need to summon libraries etc - it probably expect you to use range() with chr/ord, like so:
for i in range(ord('a'), ord('n')+1):
print chr(i),
For the rest, just play a bit more with the range()
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