Static Variable

Question

Consider storage class of a variable declared as static. Where the memory will be allocated?

(A) Code Segment

(B) Stack Segment

(C) Heap Segment

(D) Data Segment

Comments

data segment.

https://en.wikipedia.org/wiki/Static_variable

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If it is uninitialized, then BSS segment or uninitialized data segment .

If initialized, then initialized data segment.

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thanks :)

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@Kapil

Can u elaborate more initialized and uninitialized portion? plz

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^

int static i;    // default value of i=0. 

int static i=10.  // initialized explicitely with value 10.

https://en.wikipedia.org/wiki/.bss#BSS_in_C

Answer 1

Code segment or text segment: Code segment contains the code executable or code binary.
• Data segment: Data segment is sub divided into two parts
– Initialized data segment: All the global, static and constant data are stored in the data segment.
– Uninitialized data segment: All the uninitialized data are stored in BSS.
Heap: When program allocate memory at runtime using calloc and malloc function, then memory gets
allocated in heap. when some more memory need to be allocated using calloc and malloc function,
heap grows upward as shown in above diagram.
• Stack: Stack is used to store your local variables and is used for passing arguments to the functions
along with the return address of the instruction which is to be executed after the function call is over.
When a new stack frame needs to be added (as a result of a newly called function), the stack grows
downward.

Answer 2

All variables that are defined inside a function are normally created on the stack each time the function is called. These variables die as soon as control goes back from the function. However if the variables inside the function are defined as static then they do not get created on the stack. Instead they are created in a place in memory called "Data Segment". Such variables die only when progran execution comes to an end.