大约有 48,000 项符合查询结果（耗时：0.0617秒） [XML]
Signed to unsigned conversion in C - is it always safe?
...unsigned values, resulting in a large result (depending on the values of u and i).
Long Answer
According to the C99 Standard:
6.3.1.8 Usual arithmetic conversions
If both operands have the same type, then no further conversion is needed.
Otherwise, if both operands have signed intege...
Storing sex (gender) in database
... 2,147,483,648 to 2,147,483,647
BIT 1 (2 if 9+ columns) 2 (0 and 1)
CHAR(1) 1 26 if case insensitive, 52 otherwise
The BIT data type can be ruled out because it only supports two possible genders which is inadequate. While INT supports more than two options, i...
Use RSA private key to generate public key?
I don't really understand this one:
9 Answers
9
...
Patterns for handling batch operations in REST web services?
...resources. This is less common in REST patterns, but is allowed in the URI and HTTP specs. A semicolon divides horizontally related parameters within a resource.
Update several attributes, several resources:
POST /mail/0;1;2/markAsRead;category
POSTDATA: markAsRead=true,category=junk
Update seve...
Apache Spark: The number of cores vs. the number of executors
I'm trying to understand the relationship of the number of cores and the number of executors when running a Spark job on YARN.
...
Difference between Math.Floor() and Math.Truncate()
What is the difference between Math.Floor() and Math.Truncate() in .NET?
12 Answers
...
round() for float in C++
...
there is also lround and llround for integral results
– sp2danny
Feb 23 '15 at 11:55
...
How do you match only valid roman numerals with a regular expression?
...L|L?X{0,3})(IX|IV|V?I{0,3})$
Breaking it down, M{0,4} specifies the thousands section and basically restrains it to between 0 and 4000. It's a relatively simple:
0: <empty> matched by M{0}
1000: M matched by M{1}
2000: MM matched by M{2}
3000: MMM matched by M{3}
4000:...
Xcode 6 beta 2 issue exporting .ipa: “Your account already has a valid iOS distribution certificate”
...
This is what worked for me.
On my machine I kept both Xcode 5 and Xcode 6 beta.
From Xcode 6 beta, Archive the project. Close Xcode 6.
Open Xcode 5, go to Organizer and export as Ad Hoc build with proper provisioning profile.
That's it!
...
Best way to merge two maps and sum the values of same key?
I want to merge them, and sum the values of same keys. So the result will be:
15 Answers
...