Memory Allocation in System's Memory Management
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Memory Allocation in System's Memory Management

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Questions and Answers

What is the main difference between static memory allocation and dynamic memory allocation?

  • Static memory allocation is used for constants, while dynamic memory allocation is used for variables.
  • Static memory allocation is more efficient than dynamic memory allocation.
  • Static memory allocation is used for variables, while dynamic memory allocation is used for arrays.
  • Static memory allocation is determined by the compiler at compile time, while dynamic memory allocation is determined at runtime. (correct)

    • What is the main drawback of static memory allocation?

  • It is not possible to allocate memory dynamically at runtime.
  • It is not possible to read or write less elements than the declared size of the array.
  • It is not possible to deallocate memory dynamically at runtime.
  • It is not possible to read or write more elements than the declared size of the array. (correct)

    • How does dynamic memory allocation address the issue of unused memory in static memory allocation?

  • Dynamic memory allocation does not address the issue of unused memory.
  • Dynamic memory allocation allocates only the required amount of memory, and makes unused memory available to other applications. (correct)
  • Dynamic memory allocation always allocates the maximum possible memory, even if it is not needed.
  • Dynamic memory allocation is less efficient than static memory allocation, so it does not matter if memory is unused.

    • What is the main advantage of dynamic memory allocation over static memory allocation?

    <p>Dynamic memory allocation is more flexible than static memory allocation, allowing for variable memory usage.</p> Signup and view all the answers

    What is the primary purpose of static memory allocation?

    <p>To allocate memory for variables that require a fixed amount of memory.</p> Signup and view all the answers

    Which of the following is NOT a drawback of static memory allocation?

    <p>It is not possible to deallocate memory at runtime.</p> Signup and view all the answers

    What is the main difference between static memory allocation and dynamic memory allocation?

    <p>Memory is allocated at compile-time in static memory allocation and during run-time in dynamic memory allocation</p> Signup and view all the answers

    What is a key advantage of dynamic memory allocation over static memory allocation?

    <p>Dynamic memory allocation allows for memory block allocation and deallocation during program execution</p> Signup and view all the answers

    Which operator is typically used to create a dynamic space in C++ during dynamic memory allocation?

    <p>new[]</p> Signup and view all the answers

    Why is it necessary to store the address of the allocated space in a pointer variable during dynamic memory allocation in C++?

    <p>To access and modify the contents of the allocated memory block</p> Signup and view all the answers

    When is the allocated space usually deleted in dynamic memory allocation?

    <p>When the user no longer requires the memory block</p> Signup and view all the answers

    What happens when a program re-uses dynamic memory during its run-time?

    <p>Memory becomes fragmented and less efficient</p> Signup and view all the answers

    Study Notes

    Memory Management

    • Memory can be used as both static memory and dynamic memory.

    Static Memory Allocation

    • Occurs at compile-time, where the required memory is allocated to variables at the beginning of the program.
    • The memory to be allocated is fixed and determined by the compiler at compile-time.
    • Drawbacks:
      • Trying to access an array with a size declared as 10, but reading 15 elements will result in reading 10 values and 5 unknown random memory values.
      • Assigning values to 15 elements of an array with a size declared as 10 will only allow the first 10 elements to be assigned, and the remaining 5 elements cannot be accessed.
      • Wasting memory if less number of elements are stored than the declared memory, as the unused memory cells are not made available to other applications.

    Dynamic Memory Allocation

    • Occurs at run-time, making efficient use of memory by allocating the required amount of memory whenever needed.
    • Real-time problems often have unpredictable memory requirements, which dynamic memory allocation can handle.
    • Comparison with static memory allocation:
      • Memory is allocated or de-allocated during run-time.
      • A variable space can be changed during the execution of the program.
      • Memory can be re-used during the run-time of the program, making it highly effective.

    Dynamic Memory Allocation & De-allocation Criteria

    • Creating a dynamic space in memory using the new operator.
    • Storing the address of the allocated space in a pointer variable to access and modify the contents of the memory block.
    • Deleting the allocated space using the delete operator to free up the heap memory when it is no longer needed.

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    Description

    This quiz covers the concepts of memory allocation in system's memory management, focusing on static memory allocation at compile time and dynamic memory allocation at run time. Understand the difference between the two methods and learn how memory is managed in a computer system.

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