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typecast string to integer - Postgres
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If the value contains non-numeric characters, you can convert the value to an integer as follows:
SELECT CASE WHEN <column>~E'^\\d+$' THEN CAST (<column> AS INTEGER) ELSE 0 END FROM table;
The CASE operator checks the < column>, if it matches the integer pat...
What is a handle in C++?
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Is it possible to convert a HANDLE into an equivalent in Linux? I have to migrate a program that uses HANDLE from Windows to Linux.
– Cornel Verster
Nov 4 '15 at 13:33
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Finding the average of a list
...r versions of Python you can do
sum(l) / len(l)
On Python 2 you need to convert len to a float to get float division
sum(l) / float(len(l))
There is no need to use reduce. It is much slower and was removed in Python 3.
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What is the size of ActionBar in pixels?
...ppose actionBarSize returns the dp value. I got the value 48dp. That means converting it to pixels gives me 96 pixels for xhdpi.
– Muhammad
Sep 3 '14 at 18:14
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Why are Standard iterator ranges [begin, end) instead of [begin, end]?
...hat were passed an array and a size.
void func(int* array, size_t size)
Converting to half-closed ranges [begin, end) is very simple when you have that information:
int* begin;
int* end = array + size;
for (int* it = begin; it < end; ++it) { ... }
To work with fully-closed ranges, it's har...
What does a tilde do when it precedes an expression?
...11 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
So ~ converts its operand to a 32 bit integer (bitwise operators in JavaScript do that)...
0000 0000 0000 0000 0000 0000 0000 0001
If it were a negative number, it'd be stored in 2's complement: invert all bits and add 1.
...a...
How do I turn a C# object into a JSON string in .NET?
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here is online tool to convert your classes to json format, hope helps someone.
– shaijut
Jan 25 '17 at 8:24
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How to extract the file name from URI returned from Intent.ACTION_GET_CONTENT?
...ame of file from camera, firstly you have to notify MediaScanner that will convert URI of your just created file from file:// to content:// in onScanCompleted(String path, Uri uri) method stackoverflow.com/a/5815005/2163045
– murt
Oct 4 '17 at 9:11
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How to capitalize the first character of each word in a string
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The following method converts all the letters into upper/lower case, depending on their position near a space or other special chars.
public static String capitalizeString(String string) {
char[] chars = string.toLowerCase().toCharArray();
b...
How to use background thread in swift?
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Could you please update this for Swift 3? The auto converter turned it into DispatchQueue.global(priority: Int(DispatchQoS.QoSClass.userInitiated.rawValue)).async { but this throws an error like cannot invoke initializer for type 'Int' with an argument list of type '(qos_clas...