Search results
Results From The WOW.Com Content Network
Data initialization may occur without explicit syntax in a program to do so. For example, if static variables are declared without an initializer, then those of primitive data types are initialized with the value of zero of the corresponding type, while static objects of class type are initialized with their default constructors.
They are declared by writing the variable's type and name, and are optionally initialized in the same statement by assigning a value. int count ; //Declaring an uninitialized variable called 'count', of type 'int' count = 35 ; //Initializing the variable int count = 35 ; //Declaring and initializing the variable at the same time
While a variable or function may be declared many times, it is typically defined once (in C++, this is known as the One Definition Rule or ODR). Dynamic languages such as JavaScript or Python generally allow functions to be redefined, that is, re-bound; a function is a variable much like any other, with a name and a value (the definition).
When declaring a local variable or a field with the const keyword as a prefix the value must be given when it is declared. After that it is locked and cannot change. They can either be declared in the context as a field or a local variable. [10] Constants are implicitly static.
Constructor functions are usually declared in the public section, but can also be declared in the protected and private sections, if the user wants to restrict access to them. The constructor has two parts. First is the initializer list which follows the parameter list and before the method body. It starts with a colon and entries are comma ...
Hence, the BSS segment typically includes all uninitialized objects (both variables and constants) declared at file scope (i.e., outside any function) as well as uninitialized static local variables (local variables declared with the static keyword); static local constants must be initialized at declaration, however, as they do not have a ...
Some languages assist this task by offering constructs to handle the initializedness of variables; for example, C# has a special flavour of call-by-reference parameters to subroutines (specified as out instead of the usual ref), asserting that the variable is allowed to be uninitialized on entry but will be initialized afterwards.
The lazy initialization technique allows us to do this in just O(m) operations, rather than spending O(m+n) operations to first initialize all array cells. The technique is simply to allocate a table V storing the pairs ( k i , v i ) in some arbitrary order, and to write for each i in the cell T [ k i ] the position in V where key k i is stored ...