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App Inventor 2 项目合并工具 AIMerge · App Inventor 2 中文网
...ers can write code to call a screen they are not developing but they must know the name that has been assigned to that screen by its developer. Also, two different developers/screens can use the same database or asset but they must be named the same (for more details on this see the Universal Datab...
warning: incompatible implicit declaration of built-in function ‘xyz’
... In an implicit declaration, the return type is int if I recall correctly. Now, GCC has built-in definitions for some standard functions. If an implicit declaration does not match the built-in definition, you get this warning.
To fix the problem, you have to declare the functions before using them...
Why do people say there is modulo bias when using a random number generator?
...t defined in cstdlib (see this article for a general overview on rand()).
Now what happens if you want to generate a random number between say 0 and 2? For the sake of explanation, let's say RAND_MAX is 10 and I decide to generate a random number between 0 and 2 by calling rand()%3. However, rand()...
Why is `[` better than `subset`?
...eval(expr, envir, enclos) : object 'cyl' not found
because R no longer "knows" where to find the object called 'cyl'. He also points out the truly bizarre stuff that can happen if by chance there is an object called 'cyl' in the global environment:
cyl <- 4
subscramble(mtcars, cyl == 4)
cyl &...
How to find if directory exists in Python
...
@CamilStaps This question was viewed 354000 times (by now). Answers here are not only for OP, they are for anyone who could come here for whatever reason. aganders3's answer is pertinent even if it does not directly resolve OP's problem.
– Gabriel
...
jQuery see if any or no checkboxes are selected
I know how to see if an individual checkbox is selected or not.
8 Answers
8
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How to set a bitmap from resource
... R.drawable.android_logo
);
Now you can use this bitmap object, whether you want to store it, or to use it in google maps while drawing a pic on fixed latitude and longitude, or to use some where else
...
Is mongodb running?
... quickly checking if mongodb is running, this quick nc trick will let you know.
nc -zvv localhost 27017
The above command assumes that you are running it on the default port on localhost.
For auto-starting it, you might want to look at this thread.
...
How to find the width of a div using vanilla JavaScript?
...
That, or cientWidth, altho I don't know the real difference.
– JCOC611
Jan 24 '11 at 21:51
127
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What is a “thread” (really)?
...ctions.
Suppose you're reading a book, and you want to take a break right now, but you want to be able to come back and resume reading from the exact point where you stopped. One way to achieve that is by jotting down the page number, line number, and word number. So your execution context for read...