StackOverflow2013

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plurals

PO
primarykey
Id
17725557
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-07-18T13:58:34.697
FavoriteCount
0
LastActivityDate
2013-07-18T16:56:02.737
LastEditDate
2013-07-18T16:56:02.737
LastEditorUserId
2410359
OwnerUserId
2410359
ParentId
17724364
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
There is no difference between the size of memory for <pre><code>static int a,b,c; int a;int b;int c; </code></pre> Differences occur in the lifetime, location, scope & initialization. Lifetime: Were these were declare globally, both a,b,c sets would exist for the lifetime of the program. Were they both in a function, the static ones would exist for the program lifetime, but the other would exist only for the duration of the function. Further, should the function be called recursively or re-entrant, multiple sets of the non-static a,b,c, would exists. Location: A common, thought not required by C, is to have a DATA section and STACK section of memory. Global variables tend to go in DATA as well as functional static ones. The non-static version of a,b,c in a function would typically go on in STACK. Scope: Simple view: Functionally declared variables (static or not) are scoped within the function. Global variables declared static have file scope. Global variables not declared static have the scope of the entire program. Initialization: follows along the same track as lifetime. Globally declared a,b,c, static or not, are both initialized at program start. If a,b,c are in a function, only static ones are initialized (at program start). Functional non-static a,b,c are not initialized. Optimization may affect location, especially for the functional non-static a,b,c which could readily be saved in registers. Optimization may also determine that the variable is not used and optimizing it out, thus taking 0 bytes.
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singulars
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1. POIs there any difference between the size of memory allocated for the following types of declaration:
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