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What is polymorphism, what is it for, and how is it used?
...orm.
So polymorphism is the ability (in programming) to present the same interface for differing underlying forms (data types).
For example, in many languages, integers and floats are implicitly polymorphic since you can add, subtract, multiply and so on, irrespective of the fact that the types a...
error: use of deleted function
..., which would not be initialized by the default ctor.
class X {
const int x;
};
Since X::x is const, it must be initialized -- but a default ctor wouldn't normally initialize it (because it's a POD type). Therefore, to get a default ctor, you need to define one yourself (and it must initializ...
Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
... copy of a slice from a DataFrame" warning.
– PlasmaBinturong
Mar 23 '19 at 16:38
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Python TypeError: not enough arguments for format string
...', '{1}', '{2}', '{3}', '{4}', '{5}', '{6}'".format(softname, procversion, int(percent), exe, description, company, procurl)
This also fixes the error that you happened to have.
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How do I round a decimal value to 2 decimal places (for output on a page)
...cimal and Double type ToString method accepts argument for formatting. Try converting your value to Decimal/Double first.
– sohaiby
Mar 13 '16 at 8:05
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SQLite add Primary Key
... is to create a new table with the correct requirements and copy your data into it, then drop the old table.
here is the official documentation about this: http://sqlite.org/faq.html#q11
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How do I create a dynamic key to be added to a JavaScript object variable [duplicate]
... numeric value of the property whose name is numeric and whose value, when converted to a number, is the largest of all such properties. That sounds really weird, but it just means that given an array instance, the properties with names like "0", "5", "207", and so on, are all treated specially in t...
All Ruby tests raising: undefined method `authenticate' for nil:NilClass
...a Rails 3 application. It could be experiencing a few growing pains as it converts over.
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C++ wait for user input [duplicate]
...tem("pause") (need #include <iostream>).
PS: This method will also print Press any key to continue . . . on the screen. (seems perfect choice for you :))
Edit: As discussed here, There is no completely portable solution for this. Question 19.1 of the comp.lang.c FAQ covers this in some dept...
Java Pass Method as Parameter
... of Java 8, lambda expressions are a nice solution as other answers have pointed out. The answer below was written for Java 7 and earlier...
Take a look at the command pattern.
// NOTE: code not tested, but I believe this is valid java...
public class CommandExample
{
public interface Comma...