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Why do most C developers use define instead of const? [duplicate]
...t with #ifdef to do conditional compilation based on its value, or use the stringizing operator # to get a string with its value. And as the compiler knows its value at compile time it may optimize code based on that value.
For example:
#define SCALE 1
...
scaled_x = x * SCALE;
When SCALE is d...
#1071 - Specified key was too long; max key length is 767 bytes
...
MySQL assumes worst case for the number of bytes per character in the string. For the MySQL 'utf8' encoding, that's 3 bytes per character since that encoding doesn't allow characters beyond U+FFFF. For the MySQL 'utf8mb4' encoding, it's 4 bytes per character, since that's what MySQL calls actua...
CSS: Set a background color which is 50% of the width of the window
... pink;
}
Example: http://jsfiddle.net/PLfLW/1704/
The solution uses an extra fixed div that fills half the screen. Since it's fixed, it will remain in position even when your users scroll. You may have to fiddle with some z-indexes later, to make sure your other elements are above the background...
Logical XOR operator in C++?
...!= !B implements the proper XOR in that regard.
But if you care about the extra sequence point though, neither != nor bitwise ^ is the proper way to implement XOR. One possible way to do XOR(a, b) correctly might look as follows
a ? !b : b
This is actually as close as you can get to making a hom...
Should I return a Collection or a Stream?
...ood example of this are the APIs in java.nio.file.Files:
static Stream<String> lines(path)
static List<String> readAllLines(path)
Not only does readAllLines have to hold the entire file contents in memory in order to store it into the result list, it also has to read the file to t...
Is it bad practice to make a setter return “this”?
...builder pattern or a fluent interface.
It's also common in the Java API:
String s = new StringBuilder().append("testing ").append(1)
.append(" 2 ").append(3).toString();
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What is boxing and unboxing and what are the trade offs?
...d structures, enumerations.
Reference Types are:
Classes,interfaces,arrays,strings and objects
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Python Script execute commands in Terminal
... subprocess module instead.
Read here: reading a os.popen(command) into a string
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Are the shift operators () arithmetic or logical in C?
... of i, after integer promotion, be T. Assuming n to be in [0, sizeof(i) * CHAR_BIT) — undefined otherwise — we've these cases:
| Direction | Type | Value (i) | Result |
| ---------- | -------- | --------- | ------------------------ |
| Right (>>) | unsigned | ≥...
Why does Node.js' fs.readFile() return a buffer instead of string?
...asis mine):
Why does Node.js' fs.readFile() return a buffer instead of string?
Because files aren't always text
Even if you as the programmer know it: Node has no idea what's in the file you're trying to read. It could be a text file, but it could just as well be a ZIP archive or a JPG image ...