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Why are preprocessor macros evil and what are the alternatives?
...d encountered a phrase like "macro should never be used", "macro are evil" and so on, my question is: why? With the new C++11 is there a real alternative after so many years?
...
Log to the base 2 in python
....log(x, 2.0)
log2 = math.log2(x) # python 3.4 or later
Thanks @akashchandrakar and @unutbu.
float → int math.frexp(x)
If all you need is the integer part of log base 2 of a floating point number, extracting the exponent is pretty efficient:
log2int_slow = int(math.floor(math.log(x, 2.0)...
How do I check if an integer is even or odd? [closed]
... if (x % 2)
printf("%d is odd\n", x);
return 0;
}
/* and.c */
#include <stdio.h>
int main(void)
{
int x;
for (x = 0; x < 10; x++)
if (x & 1)
printf("%d is odd\n", x);
return 0;
}
I then compiled these with gcc 4.1.3 on one of my m...
Stack smashing detected
...elated errors, but like a debugger, it may help you pin-point the location and reason for the crash.
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Formatting code in Notepad++
... Delete to start of line
Ctrl-Shft-Delete Delete to end of line
Ctrl-U Convert to lower case
Ctrl-Shft-U Convert to UPPER CASE
Ctrl-B Go to matching brace
Ctrl-Shft-R Start to record /Stop recording the macro
Ctrl-Shft-P Play recorded macro
Ctrl-Q Block comment/uncomment
Ctrl-Shft-Q Stream com...
How to capitalize the first letter in a String in Ruby
...
Thank you just what I was looking for, useful for converting headings to 'sentence case'
– Good Lux
Sep 23 '17 at 11:12
2
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How to fix “Incorrect string value” errors?
...
The table and fields have the wrong encoding; however, you can convert them to UTF-8.
ALTER TABLE logtest CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
ALTER TABLE logtest DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
ALTER TABLE logtest CHANGE title title VARCHAR(100) ...
Does Swift have access modifiers?
...e highest (least restrictive) to the lowest (most restrictive).
1. open and public
Enable an entity to be used outside the defining module (target). You typically use open or public access when specifying the public interface to a framework.
However, open access applies only to classes and clas...
Getting the current Fragment instance in the viewpager
...dText:
Fragment page = getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.pager + ":" + ViewPager.getCurrentItem());
// based on the current position you can then cast the page to the correct
// class and call the method:
if (ViewPager.getCurrentItem() == 0...
Difference between two lists
...Using Except is exactly the right way to go. If your type overrides Equals and GetHashCode, or you're only interested in reference type equality (i.e. two references are only "equal" if they refer to the exact same object), you can just use:
var list3 = list1.Except(list2).ToList();
If you need t...