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App Inventor 2 传感器应用教程 - 位置/方向/加速度传感器 · App Inventor 2 中文网
...位置传感器1.LocationChanged(纬度, 经度, 海拔, 速度) {
标签_经度.Text = join("经度：", 经度)
标签_纬度.Text = join("纬度：", 纬度)
标签_海拔.Text = join("海拔：", formatDecimal(海拔, 1), "米")
标签_速度.Text = join("速度：", formatDecimal(速度...
Ways to save Backbone.js model data?
...http://localhost:8888/donut/15 It will simply add /donut stem to your site root.
If you're STILL with me, good. I think. Unless you're confused. But we'll trudge on anyway. The second part of this is the SERVER side. We've talked about different verbs of HTTP and the semantic meanings behind those ...
How do I find out what keystore my JVM is using?
...
Your keystore will be in your JAVA_HOME---> JRE -->lib---> security--> cacerts. You need to check where your JAVA_HOME is configured, possibly one of these places,
Computer--->Advanced --> Environment variables---> JAVA_HOME
Your serv...
How do I use prepared statements in SQlite in Android?
... Below are some examples:
Create a table
String sql = "CREATE TABLE table_name (column_1 INTEGER PRIMARY KEY, column_2 TEXT)";
SQLiteStatement stmt = db.compileStatement(sql);
stmt.execute();
The execute() method does not return a value so it is appropriate to use with CREATE and DROP but not in...
How to avoid .pyc files?
...terpreter. This setting is available
to Python programs as the
sys.dont_write_bytecode variable, and
Python code can change the value to
modify the interpreter’s behaviour.
Update 2010-11-27: Python 3.2 addresses the issue of cluttering source folders with .pyc files by introducing a spe...
How can I correctly prefix a word with “a” and “an”?
...of this, such as this one in PHP by Jaimie Sirovich :
function aOrAn($next_word)
{
$_an = array('hour', 'honest', 'heir', 'heirloom');
$_a = array('use', 'useless', 'user');
$_vowels = array('a','e','i','o','u');
$_endings = array('ly', 'ness', 'less', 'lessly', 'ing', 'ally',...
Alternatives to gprof [closed]
... in this way:
g++ -m64 -fno-omit-frame-pointer -g main.cpp -L. -ltcmalloc_minimal -o my_test
I use libmalloc_minimial.so since it is compiled with -fno-omit-frame-pointer while libc malloc seems to be compiled without this option.
Then I run my test program
./my_test 100000000
Then I record ...
Why use String.Format? [duplicate]
...ing s = string.Format("Hey, {0} it is the {1}st day of {2}. I feel {3}!", _name, _day, _month, _feeling);
vs:
string s = "Hey," + _name + " it is the " + _day + "st day of " + _month + ". I feel " + feeling + "!";
Format Specifiers
(and this includes the fact you can write custom formatters)
...
How do I sort an observable collection?
... you could use an extension method on the collection itself
var sortedOC = _collection.OrderBy(i => i.Key);
private void doSort()
{
ObservableCollection<Pair<ushort, string>> _collection =
new ObservableCollection<Pair<ushort, string>>();
_collection.Add...
Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell
...
Using GHC 7.0.3, gcc 4.4.6, Linux 2.6.29 on an x86_64 Core2 Duo (2.5GHz) machine, compiling using ghc -O2 -fllvm -fforce-recomp for Haskell and gcc -O3 -lm for C.
Your C routine runs in 8.4 seconds (faster than your run probably because of -O3)
The Haskell solution runs in...