Wow! the things on the stack). use an iterative algorithm instead of a recursive one, look at I/O vs. CPU-bound tasks, perhaps add multithreading or multiprocessing). Code that repeatedly allocates new memory without deallocating it when it is no longer needed leads to a memory leak. It costs less to build and maintain a stack. A heap is a general term for anything that can be dynamically allocated. Difference between Heap memory size and RAM - Coderanch Stored in computer RAM just like the heap. @ZaeemSattar Think of the static function variable like a hidden global or like a private static member variable. See my answer [link]. Three important memory sections are: Code; Stack; Heap; Code (also called Text or Instructions) section of the memory stores code instructions in a form that the machine understands. Here is my attempt at one: The stack is meant to be used as the ephemeral or working memory, a memory space that we know will be entirely deleted regularly no matter what mess we put in there during the lifetime of our program. Stack vs Heap Memory - Java Memory Management (Pointers and dynamic memory) Naveen AutomationLabs 315K subscribers Join Subscribe Share 69K views 2 years ago Whiteboard Learning - By. Probably you may also face this question in your next interview. Go memory usage (Stack vs Heap) Now that we are clear about how memory is organized let's see how Go uses Stack and Heap when a program is executed. To follow a pointer through memory: The stack is for static (fixed size) data. We will talk about pointers shortly. (I have moved this answer from another question that was more or less a dupe of this one.). Typically the OS is called by the language runtime to allocate the heap for the application. For a better understanding please have a look at the below image. Much faster to allocate in comparison to variables on the heap. Since some answers went nitpicking, I'm going to contribute my mite. This answer was the best in my opinion, because it helped me understand what a return statement really is and how it relates to this "return address" that I come across every now and then, what it means to push a function onto the stack, and why functions are pushed onto stacks. Its only disadvantage is the shortage of memory, since it is fixed in size. Interview question for Software Developer. Another nitpick- most of the answers (lightly) imply that the use of a "stack" is required by the, [@Heath] I have a small comment on your answer. The reference variable of the String emp_name argument will point to the actual string from the string pool into the heap memory. Now you can examine variables in stack or heap using print. When it comes to object variables, these are merely references (pointers) to the actual objects on the heap. A stack is usually pre-allocated, because by definition it must be contiguous memory. Some people think of these concepts as C/C++ specific. 4. If you access memory more than one page off the end of the stack you will crash). A particularly poignant example of why it's important to distinguish between lifetime and scope is that a variable can have local scope but static lifetime - for instance, "someLocalStaticVariable" in the code sample above.

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