Apr 28, 2014 · After reading the question, I know the differences between declaration and definition. So does it mean definition equals declaration plus initialization?

Jul 30, 2015 · A variable declaration (e.g., var foo) causes that variable to be created as soon as the "lexical environment" is instantiated. For example, if that variable were defined within a …

Dec 29, 2013 · 28 Is this a variable definition or declaration? And why? var x; ..and is the memory reserved for x after this statement? EDIT: In C extern int x; is a declaration, int x = 5; is a …

A variable is introduced by the declaration of a reference other than a non-static data member or of an object. The variable’s name, if any, denotes the reference or object. My take on this, …

Sep 11, 2009 · Definition associates the variable with a type and allocates memory, whereas declaration just specifies the type but doesn't allocate memory. Declaration is more useful …

int x; // at file scope, declares and "tentatively" defines x As written in C Standard, a declaration specifies the interpretation and attributes of a set of identifiers and a definition for an object, …

The clean, reliable way to declare and define global variables is to use a header file to contain an extern declaration of the variable. The header is included by the one source file that defines …

Jul 30, 2012 · The way that Java handles "definition without initialization" of a field or variable does not require a single "declaration" point. If an initialization of a variable is required, it may …

In case I have a variable that may be used in several sources - is it a good practice to declare it in a header? or is it better to declare it in a .c file and use extern in other files?

Mar 23, 2009 · To be a definition (e.g. of a previously declared extern variable in its defining translation unit), it would need the type (and the assignment component is optional).