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...四十一枝花")
elseif age > 60 and sex ~="Female" then
print("old man without country!")
elseif age < 20 then
io.write("too young, too naive!\n")
else
local age = io.read()
print("Your age is "..age)
end
上面的语句不但展示了if-else语句...
Which HTML elements can receive focus?
...t target the same elements as @ReeCube's selectors, because yours does not include elements that don't have a tabindex explicitly set. For example <a href="foo.html">Bar</a> is certainly focusable because it's an a element that has an href attribute. But your selector does not include it...
GoogleTest: How to skip a test?
... This feature is not released yet. It's unlikely that it will be included in a 1.8.x branch, since only fixes are accepted there. 1.9 is not available yet, not even announced at this time.
– ocroquette
Apr 14 '19 at 7:11
...
What do the following phrases mean in C++: zero-, default- and value-initialization?
...s follow C++98 rules, while GCC 3.4.5 and Comeau follow the C++03 rules:
#include <cstdio>
#include <cstring>
#include <new>
struct A { int m; }; // POD
struct B { ~B(); int m; }; // non-POD, compiler generated default ctor
struct C { C() : m() {}; ~C(); int m; }; // non-POD, def...
What is the “right” JSON date format?
...
Here's why:
It's human readable but also succinct
It sorts correctly
It includes fractional seconds, which can help re-establish chronology
It conforms to ISO 8601
ISO 8601 has been well-established internationally for more than a decade
ISO 8601 is endorsed by W3C, RFC3339, and XKCD
That being...
Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
...ns is to insert indicator variables in each data.frame and then merge:
a1$included_a1 <- TRUE
a2$included_a2 <- TRUE
res <- merge(a1, a2, all=TRUE)
missing values in included_a1 will note which rows are missing in a1. similarly for a2.
One problem with your solution is that the column o...
Is there a performance difference between i++ and ++i in C++?
...n units. Compiler with g++ 4.5.
Ignore the style issues for now
// a.cc
#include <ctime>
#include <array>
class Something {
public:
Something& operator++();
Something operator++(int);
private:
std::array<int,PACKET_SIZE> data;
};
int main () {
Something s;
...
Type hinting a collection of a specified type
...In September 2015, Python 3.5 was released with support for Type Hints and includes a new typing module. This allows for the specification of types contained within collections. As of November 2015, JetBrains PyCharm 5.0 fully supports Python 3.5 to include Type Hints as illustrated below.
Update...
Diff Algorithm? [closed]
...nd its Variations is a fantastic paper and you may want to start there. It includes pseudo-code and a nice visualization of the graph traversals involved in doing the diff.
Section 4 of the paper introduces some refinements to the algorithm that make it very effective.
Successfully implementing th...
moveCamera with CameraUpdateFactory.newLatLngBounds crashes
... LatLngBounds bounds = new LatLngBounds.Builder()
.include(PERTH)
.include(SYDNEY)
.include(ADELAIDE)