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const char *, char const *, char * const 异同？const修饰符各位置有何区...
const char * p = new char('a'); 这个是常字符，即p的内容不能被修改。
char const * p 意义同上，没有区别。
这时，*p = 'c'; 会报错。
char * const p = new char('a'); 这个是常指针，即p指针本身不可被修改。
这时，p = new char; 会报...
Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
...as to rewrite the pascal FOR loop myself in assembly, at which point these extra instructions no longer had a positive effect. Perhaps free pascal's generated code was harder for the processor to predict than the simple counter I replaced it with.
– tangentstorm
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How to round a number to significant figures in Python
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%g in string formatting will format a float rounded to some number of significant figures. It will sometimes use 'e' scientific notation, so convert the rounded string back to a float then through %s string formatting.
>>&g...
Android Gallery on Android 4.4 (KitKat) returns different URI for Intent.ACTION_GET_CONTENT
...
startActivityForResult(Intent.createChooser(intent, getResources().getString(R.string.select_picture)),GALLERY_INTENT_CALLED);
} else {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/jpeg");
startActiv...
Is there a way to include commas in CSV columns without breaking the formatting?
...ing a js variable to CSV, and putting an extra pair of quotes around every string, helped solve the problem of "John Blow, CFA", as mentioned in the question.
– Madhulika Mukherjee
Dec 2 '15 at 12:29
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How do I get a list of column names from a psycopg2 cursor?
...ch led me to this page in the first place):
import psycopg2
from psycopg2.extras import RealDictCursor
ps_conn = psycopg2.connect(...)
ps_cursor = psql_conn.cursor(cursor_factory=RealDictCursor)
ps_cursor.execute('select 1 as col_a, 2 as col_b')
my_record = ps_cursor.fetchone()
print (my_record['...
Is an array name a pointer?
...y has, you must either use a sentinel value (such as the 0 terminator in C strings) or you must pass the number of elements as a separate parameter.
Which *may* affect how the address value is interpreted - depends on the machine.
...
How do I remove  from the beginning of a file?
...
it translates to php as $string = preg_replace('/\x{EF}\x{BB}\x{BF}/','',$string); . before you use this, reconsider if you can't fix the problem at the source instead.
– commonpike
Oct 6 '11 at 15:53
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Why does using an Underscore character in a LIKE filter give me all the results?
...abc', 'aabc', 'xyzabc' and so on, but no 'xyzabcd', 'xabcdd' and any other string that does not end with 'abc'.
In your case you have searched by '%_%'. This will give all the rows with that column having one or more characters, that means any characters, as its value. This is why you are getting a...
What is the best way to implement nested dictionaries?
...se objects? My autovivification object contains just pandas dataframes and string.
– jason
Feb 11 '19 at 14:39
@jason ...