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In computer programming, initialization (or initialisation) is the assignment of for a flowchart or variable. The manner in which initialization is performed depends on programming language, as well as type, storage class, etc., of an object to be initialized. Programming constructs which perform initialization are typically called initializers and initializer lists. Initialization is distinct from (and preceded by) declaration, although the two can sometimes be conflated in practice. The complement of initialization is finalization, which is primarily used for objects, but not variables.
Initialization is done either by statically embedding the value at compile time, or else by assignment at run time. A section of code that performs such initialization is generally known as 'initialization code' and may include other, one-time-only, functions such as opening files; in object-oriented programming, initialization code may be part of a constructor (class method) or an initializer (instance method). Setting a memory location to hexadecimal zeroes is also sometimes known as 'clearing' and is often performed by an exclusive or instruction (both operands specifying the same variable), at machine code level, since it requires no additional memory access.
C family of languages[edit]
Initializer[edit]
In C/C99/C++, an initializer is an optional part of a declarator. It consists of the '=' character followed by an expression or a comma-separated list of expressions placed in curly brackets (braces). The latter list is sometimes called the 'initializer list' or 'initialization list' (although the term 'initializer list' is formally reserved for initialization of class/struct members in C++; see below).A declaration which creates a data object, instead of merely describing its existence, is commonly called a definition.
Many find it convenient to draw a distinction between the terms 'declaration' and 'definition', as in the commonly seen phrase 'the distinction between a declaration and definition..', implying that a declaration merely designates a data object (or function). In fact, according to the C++ standard, a definition is a declaration. Still, the usage 'declarations and definitions', although formally incorrect, is common.[1] Although all definitions are declarations, not all declarations are definitions.
C examples:
C++ examples:
Initializer list[edit]
In C++, a constructor of a class/struct can have an initializer list within the definition but prior to the constructor body. It is important to note that when you use an initialization list, the values are not assigned to the variable. They are initialized. In the below example, 0 is initialized into re and im.Example:
Here, the construct : re(0), im(0) is the initializer list.
Sometimes the term 'initializer list' is also used to refer to the list of expressions in the array or struct initializer.
C++11 provides for a more powerful concept of initializer lists, by means of a template, called std::initializer_list. Caret 2 1.
Default initialization[edit]
The Initial 1 0 Percent
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.
See also[edit]
Initial 1041 Return
- Finalizer Process & related Finalization Pattern
References[edit]
- ^C++ FAQs, by Cline, Lomow, and Girou, Addison-Wesley, 1999, ISBN0-201-30983-1.
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