What do you understand by static memory allocation and dynamic memory allocation?

Answer 1

MEMORY ALLOCATION MODELS……

STATIC MEMORY ALLOCATION DYNAMIC MEMORY ALLOCATION

Memory is allocated before the execution of the program begins.

(During Compilation)

Memory is allocated during the execution of the program.

No memory allocation or deallocation actions are performed during Execution.

Memory Bindings are established and destroyed during the Execution.

Variables remain permanently allocated.

Allocated only when program unit is active.

Implemented using stacks and heaps.

Implemented using data segments.

Pointer is needed to accessing variables.

No need of Dynamically allocated pointers.

Faster execution than Dynamic.

Slower execution than static.

More memory Space required.

Less Memory space required.

Answer 2

Static allocation mean that if you create an object of this type it will exists all life of your program without an option using that chunk of memory of something else.
When you are using dynamic allocation, you object can destroyed at virtually any moment and that memory can be reused for something else.

Static method is easier to use but it does not give flexibility.

Dynamic method is much harder to use and manage, but it gives a lot of flexibility and allows to use memory more efficiently.

Answer 3

As to physical memory:

• Static memory will store its data as long as power is available. It is commonly used with a battery to retain small amounts of data when the main power to the computer is off.
• Dynamic memory requires not only power but active refresh cycles that read and write back internally every row of data bits periodically. A Dynamic memory cell is much smaller and cheaper than a Static memory cell, so it is used for the main memory.
• Non-volatile memory (e.g. magnetic core memory, FLASH) will retain data even without power.

As to memory allocation in a program:

• Statically allocated memory is allocated once when the program enters and is not deallocated until the program exits.
• Dynamically allocated memory is allocated on demand when the program needs it, and can be deallocated later when the program no longer needs it.

Answer 4

Static memory is pre determined memory and has a fixed value in it ,while dynamic memory is allocated at run time by depending on the resources used.