For annotating some point of interest on map, we use pin annotation. Now, start by creating annotation object first.
MKPointAnnotation *pointAnnotation = [[MKPointAnnotation alloc] init];
Now provide coordinate to pointAnnotation,as
CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake...
The extension 'realurl' provides complete transformation of URLs with GET parameter in the browser, like “index.php?id=123&type=0&L=1” into a virtual path, a so called “Speaking URL” like “home/about-us/index.html” and back again. The objective is that URLs shall be as human readable as poss...
A program unit which is not an internal subprogram may contain other program units, called internal subprograms.
program prog
implicit none
contains
function f()
end function f
subroutine g()
end subroutine g
end program
Such an internal subprogram has a number of features:
t...
A distinctive syntactic peculiarity of C is that declarations mirror the use of the declared object as it would be in a normal expression.
The following set of operators with identical precedence and associativity are reused in declarators, namely:
the unary * "dereference" operator wh...
Using an incorrect format specifier in the first argument to printf invokes undefined behavior.
For example, the code below invokes undefined behavior:
long z = 'B';
printf("%c\n", z);
Here is another example
printf("%f\n",0);
Above line of code is undefined behavior. %...
mconcat :: [a] -> a is another method of the Monoid typeclass:
ghci> mconcat [Sum 1, Sum 2, Sum 3]
Sum {getSum = 6}
ghci> mconcat ["concat", "enate"]
"concatenate"
Its default definition is mconcat = foldr mappend mempty.
We cannot break a string into arbitrary points (because a System.Char may not be valid alone because it's a combining character or part of a surrogate) then code must take that into account (note that with length I mean the number of graphemes not the number of code-units):
public static IEnumerabl...
Press Ctrl + v to enter into visual block mode.
Use ↑ / ↓ / j / k to select multiple lines.
Press Shift + i and start typing what you want.
After you press Esc, the text will be inserted into all the lines you selected.
Remember that Ctrl+c is not 100% equivalent to Esc and will not work in this...
F# Interactive, is a REPL environment that lets you execute F# code, one line at a time.
If you have installed Visual Studio with F#, you can run F# Interactive in console by typing "C:\Program Files (x86)\Microsoft SDKs\F#\4.0\Framework\v4.0\Fsi.exe". On Linux or OS X, the command is fsh...
With TypeScript 1.8 it becomes possible for a type parameter constraint to reference type parameters from the same type parameter list. Previously this was an error.
function assign<T extends U, U>(target: T, source: U): T {
for (let id in source) {
target[id] = source[id];
...
Folds are (higher-order) functions used with sequences of elements. They collapse seq<'a> into 'b where 'b is any type (possibly still 'a). This is a bit abstract so lets get into concrete practical examples.
Calculating the sum of all numbers
In this example, 'a is an int. We have a list of...
int x = 5 / 0; // Undefined behavior
Division by 0 is mathematically undefined, and as such it makes sense that this is undefined behavior.
However:
float x = 5.0f / 0.0f; // x is +infinity
Most implementation implement IEEE-754, which defines floating point division by zero to return N...
int x = INT_MAX + 1;
// x can be anything -> Undefined behavior
If during the evaluation of an expression, the result is not mathematically defined or not in the range of representable values for its type, the behavior is undefined.
(C++11 Standard paragraph 5/4)
This is one of the mo...
Interfaces may have variant type parameters.
interface IEnumerable<out T>
{
// ...
}
interface IComparer<in T>
{
// ...
}
but classes and structures may not
class BadClass<in T1, out T2> // not allowed
{
}
struct BadStruct<in T1, out T2> // not allo...
LOOP AT itab INTO wa.
ENDLOOP.
FIELD-SYMBOLS <fs> LIKE LINE OF itab.
LOOP AT itab ASSIGNING <fs>.
ENDLOOP.
LOOP AT itab ASSIGNING FIELD-SYMBOL(<fs>).
ENDLOOP.
LOOP AT itab REFERENCE INTO dref.
ENDLOOP.
LOOP AT itab TRANSPORTING NO FIELDS.
ENDLOOP.
Conditional L...
CLP(FD) constraints are provided by all serious Prolog implementations. They allow us to reason about integers in a pure way.
?- X #= 1 + 2.
X = 3.
?- 5 #= Y + 2.
Y = 3.
CLP(FD) constraints are completely pure relations. They can be used in all directions for declarative integer arithmetic:
?- X #= 1+2.
X = 3.
?- 3 #= Y+2.
Y = 1.
A browser's debugging console can be used in order to print simple messages. This debugging or web console can be directly opened in the browser (F12 key in most browsers – see Remarks below for further information) and the log method of the console Javascript object can be invoked by typing the fol...
