大约有 5,550 项符合查询结果（耗时：0.0128秒） [XML]
How to get current memory usage in android?
...
activityManager.getMemoryInfo(mi);
double availableMegs = mi.availMem / 0x100000L;
//Percentage can be calculated for API 16+
double percentAvail = mi.availMem / (double)mi.totalMem * 100.0;
Explanation of the number 0x100000L
1024 bytes == 1 Kibibyte
1024 Kibibyte == 1 Mebibyte
102...
Why dict.get(key) instead of dict[key]?
...des looking up all the valid keys only)
def getway(d):
for i in range(100):
s = d.get(i)
def lookup(d):
for i in range(100):
s = d[i]
Now timing these two functions using timeit
>>> import timeit
>>> print(timeit.timeit("getway({i:i for i in range(100)}...
Find size of object instance in bytes in c#
... start_mem = GC.GetTotalMemory(true);
aclass[] array = new aclass[1000000];
for (int n = 0; n < 1000000; n++)
array[n] = new aclass();
double used_mem_median = (GC.GetTotalMemory(false) - start_mem)/1000000D;
Do not use serialization.A binary formatter adds...
How to change the default GCC compiler in Ubuntu?
...ll g++-4.5
update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.6 100
update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.5 50
update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 100
update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.5 50
update-alternatives...
Initializing a two dimensional std::vector
...:
std::vector<std::vector<int>>v(10,std::vector<int>(11,100));
10 is the size of the outer or global vector, which is the main one, and 11 is the size of inner vector of type int, and initial values are initialized to 100! That's my first help on stack, i think it helps someone....
How can I center a div within another div? [duplicate]
...y: fiddle
CSS
.container {
background: yellow;
width: %100;
display: flex;
flex-direction: row;
flex-wrap: wrap;
justify-content: center;
align-items: center;
}
.centered-div {
width: 80%;
height: 190px;
mar...
Select n random rows from SQL Server table
...
SET STATISTICS TIME ON
SET STATISTICS IO ON
/* newid()
rows returned: 10000
logical reads: 3359
CPU time: 3312 ms
elapsed time = 3359 ms
*/
SELECT TOP 1 PERCENT Number
FROM Numbers
ORDER BY newid()
/* TABLESAMPLE
rows returned: 9269 (varies)
logical reads: 32
CPU time: 0 ms
...
How can I scale an image in a CSS sprite
...ion:relative; overflow:hidden; max-width:160px;}
.stretchy .spacer {width: 100%; height: auto;}
.stretchy .sprite {position:absolute; top:0; left:0; max-width:none; max-height:100%;}
.stretchy .sprite.s2 {left:-100%;}
.stretchy .sprite.s3 {left:-200%;}
HTML
<a class="stretchy" href="#">
&...
What are the differences between a multidimensional array and an array of arrays in C#?
...0.349 25.861 26.214 19.677 20.171
5.050 5.085 6.412 5.225 5.100 5.751 6.650 5.222 6.770 5.305
The first row are timings of jagged arrays, the second shows multidimensional arrays and the third, well that's how it should be. The program is shown below, FYI this was tested r...
How to format numbers? [duplicate]
... I first wrote this answer, but the current status looks good.
var n = 100000;
var value = n.toLocaleString(
undefined, // leave undefined to use the browser's locale,
// or use a string like 'en-US' to override it.
{ minimumFractionDigits: 2 }
);
console.log(value);
// In en-US...