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How to generate a random integer number from within a range
...rong. 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, ..., which is...
Draw in Canvas by finger, Android
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+200
Start By going through the Fingerpaint demo in the sdk sample.
Another Sample:
public class MainActivity extends Activity {
D...
What is the result of % in Python?
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310
The % (modulo) operator yields the remainder from the division of the first argument by the s...
Android dex gives a BufferOverflowException when building
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230
No need to downgrade the build tools back to 18.1.11, this issue is fixed with build tools 19.0....
Linq order by boolean
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Correct, false (0) comes before true (1) in ascending (default) sorting order.
– silkfire
Apr 9 '17 at 23:13
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Create list of single item repeated N times
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809
You can also write:
[e] * n
You should note that if e is for example an empty list you get a...
Show data on mouseover of circle
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answered May 29 '12 at 20:25
Lars KotthoffLars Kotthoff
98.3k1313 gold badges176176 silver badges180180 bronze badges
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Why does ~True result in -2?
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240
int(True) is 1.
1 is:
00000001
and ~1 is:
11111110
Which is -2 in Two's complement1
1 Fl...
How does Duff's device work?
...re's the Wikipedia example with some notations.
Let's say you're copying 20 bytes. The flow control of the program for the first pass is:
int count; // Set to 20
{
int n = (count + 7) / 8; // n is now 3. (The "while" is going
// ...
Check if a value is within a range of numbers
...e. You don't need "multiple if" statements to do it, either:
if (x >= 0.001 && x <= 0.009) {
// something
}
You could write yourself a "between()" function:
function between(x, min, max) {
return x >= min && x <= max;
}
// ...
if (between(x, 0.001, 0.009)) {
//...