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Why can't I use a list as a dict key in python?
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Why not just convert the list to a tuple? Why convert it to a string? If you use a tuple, it'll work correctly with classes that have a custom comparison method __eq__. But if you convert them to strings, everything is compared by its str...
Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?
...ype float are passed as variadic parameters, such arguments are implicitly converted to type double. This is the reason why in printf format specifiers %f and %lf are equivalent and interchangeable. In printf you can "cross-use" %lf with float or %f with double.
But there's no reason to actually do...
When can I use a forward declaration?
...ssuming the following forward declaration.
class X;
Here's what you can and cannot do.
What you can do with an incomplete type:
Declare a member to be a pointer or a reference to the incomplete type:
class Foo {
X *p;
X &r;
};
Declare functions or methods which accept/return inco...
Is there a difference between x++ and ++x in java?
Is there a difference between ++x and x++ in java?
16 Answers
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How do I choose grid and block dimensions for CUDA kernels?
This is a question about how to determine the CUDA grid, block and thread sizes. This is an additional question to the one posted here .
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Can code that is valid in both C and C++ produce different behavior when compiled in each language?
C and C++ have many differences, and not all valid C code is valid C++ code.
(By "valid" I mean standard code with defined behavior, i.e. not implementation-specific/undefined/etc.)
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How to generate a random int in C?
Is there a function to generate a random int number in C? Or will I have to use a third party library?
27 Answers
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Get screen width and height in Android
How can I get the screen width and height and use this value in:
29 Answers
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Live character count for EditText
...g what the best way to do a live character count of an edit-text box is in Android. I was looking at this but I couldn't seem to make any sense of it.
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Handling click events on a drawable within an EditText
...left of the screen. You should use event.getX() instead of event.getRawX() and use editText.getWidth() instead of editText.getRight()
– Fletcher Johns
Nov 30 '15 at 11:51
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