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Global and static variables are stored in bss section of the data segment. Local variables are stored on the stack and are valid until the program exits from the function in which they are defined.

Any comments on optimization, guys?

BSS = Block Started by Symbol

That doesn't answer the question of when to use them. Perhaps something like, use globals as a last resort, because since they are accessible to everyone class, all bets are off. They could be getting modified all over the place, so debugging can be very difficult.

That doesn't answer the question of when to use them. Perhaps something like, use globals as a last resort, because since they are accessible to everyone class, all bets are off. They could be getting modified all over the place, so debugging can be very difficult.

Data segment is divided into 3 parts data, BSS, Heap

data part is further divided into 2 parts Read only memory & read write memory...
all global and static variables that are intialsed to a value but not to '0'(deafult intialisation) are stored in data part.
All constats are stored in Read only memory in data part.

BSS - All global and static variables which are not initialized to any value (but will be initialized to 0 as default initialization) will be stored in BSS part.

Heap - managed by malloc, calloc, realloc...

Please read the wiki for data segment..

well, according to wiki, data segment is divide into 4: data, stack, bss, heap.
stack: local var
data: constants
heap: dynamically allocated var
bss: global var and static var which is not initialized

@Jiez...its mentioned tht the main memory (RAM) is divided in 2 parts - data segment and stack..and data segment is further divided into 3 parts...the above mentioned main memory is only a part of the main memory which doesn't include the address space occupied by OS or device drivers or any ISR...