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Run an untrusted C program in a sandbox in Linux that prevents it from opening files, forking, etc.?
...
You can use Qemu to test assignments quickly. This procedure below takes less than 5 seconds on my 5 year old laptop.
Let's assume the student has to develop a program that takes unsigned ints, each on their own line, until a line with "-1" arr...
How do you test running time of VBA code?
...p:
Public Declare Function GetTickCount Lib "kernel32.dll" () As Long
Sub testTimer()
Dim t As Long
t = GetTickCount
For i = 1 To 1000000
a = a + 1
Next
MsgBox GetTickCount - t, , "Milliseconds"
End Sub
after http://www.pcreview.co.uk/forums/grab-time-milliseconds-included-vba-t994765.html (as ...
Where is the list of predefined Maven properties
...ow the XPath as a . delimited property.
So, for example:
${project.build.testOutputDirectory} == ${project.build.directory}/test-classes
And:
${project.build.directory} == ${project.basedir}/target
Thus combining them, we find:
${project.build.testOutputDirectory} == ${project.basedir}/tar...
Difference between StringBuilder and StringBuffer
...han StringBuffer because it's not synchronized.
Here's a simple benchmark test:
public class Main {
public static void main(String[] args) {
int N = 77777777;
long t;
{
StringBuffer sb = new StringBuffer();
t = System.currentTimeMillis();
...
Seeding the random number generator in Javascript
...
sfc32 (Simple Fast Counter)
sfc32 is part of the PractRand random number testing suite (which it passes of course). sfc32 has a 128-bit state and is very fast in JS.
function sfc32(a, b, c, d) {
return function() {
a >>>= 0; b >>>= 0; c >>>= 0; d >>>=...
How to quickly check if folder is empty (.NET)?
...
As always, you are fastest off the trigger! Beat me by a few seconds there! :-)
– Cerebrus
Apr 16 '09 at 10:55
...
Find first element by predicate
...ns return a lazy stream). To convince you, you can simply do the following test:
List<Integer> list = Arrays.asList(1, 10, 3, 7, 5);
int a = list.stream()
.peek(num -> System.out.println("will filter " + num))
.filter(x -> x > 5)
.findFirst()
...
Dashed line border around UIView
...resolution like suppose your normal image size is 120x120 and it's name is test.png then create another two image with name test@2x.png and test@3x.png with size of 240x240 and 360x360 which is used in all the apple device automatically with it's related name. (i.e. test.png is use in iPhone 4, test...
How to properly reuse connection to Mongodb across NodeJs application and modules
...useNewUrlParser: true }, function( err, client ) {
_db = client.db('test_db');
return callback( err );
} );
},
getDb: function() {
return _db;
}
};
To use it, you would do this in your app.js:
var mongoUtil = require( 'mongoUtil' );
mongoUtil.connectToServer( function...
How to override toString() properly in Java?
...
If you're interested in Unit-Tests, then you can declare a public "ToStringTemplate", and then you can unit test your toString. Even if you don't unit-test it, I think its "cleaner" and uses String.format.
public class Kid {
public static final St...