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Computer Science Engineering (CSE) Exam  >  Computer Science Engineering (CSE) Questions  >  In stack, memory allocation and deallocation ... Start Learning for Free
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In stack, memory allocation and deallocation is performed in ________.
  • a)
    Last­-in-­first­-out (LIFO) manner
  • b)
    First-­in-­first­-out (FIFO) manner
  • c)
    First-­in-­last-­out (FILO) manner 
  • d)
    Random manner
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
In stack, memory allocation and deallocation is performed in ________....
A stack is a linear data type that acts as a collection of elements. A stack is a linear data structure that operates memory allocation and deallocation on the Last-In-First-Out (LIFO) principle. In linear data structures, the elements are accessed in sequential order but it is not compulsory to store all elements sequentially. It has two main operations:
  • Push, which adds a new element to the collection, and
  • Pop, which removes the most recently added element that hasn't been removed yet.
Hence the correct answer is Last­-in-­first­-out (LIFO) manner.
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Community Answer
In stack, memory allocation and deallocation is performed in ________....
A stack is a linear data type that acts as a collection of elements. A stack is a linear data structure that operates memory allocation and deallocation on the Last-In-First-Out (LIFO) principle. In linear data structures, the elements are accessed in sequential order but it is not compulsory to store all elements sequentially. It has two main operations:
  • Push, which adds a new element to the collection, and
  • Pop, which removes the most recently added element that hasn't been removed yet.
Hence the correct answer is Last­-in-­first­-out (LIFO) manner.
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Which of the following statement is true for Power-of-2 allocators? Buddy System splits and recombines memory blocks in a predetermined manner during allocation and deallocation. No splitting of blocks takes place, also no effort is made to coalesce adjoining blocks to form larger blocks; when released, a block is simply returned to its free list. When a request is made for m bytes, the allocator first check the free list containing blocks whose size is 2i for the smallest value of i such that 2i ≥ m.if the free list is empty ,it checks the list containing blocks that are higher the next higher power of 2 in size on so on. an entire block is allocated to a request. When a request is made for m bytes. the system finds the smallest power of 2 that is ≥ m. Let this be 2i.if the list is empty, it checks the lists for block of size 2i+1.it takes one block off this list and splits it into two halves of size 2i.it put one of these blocks into the free list of size 2i,and uses the other block to satisfy the request.

Which of the following statement is true for buddy system allocators? Buddy System splits and recombines memory blocks in a predetermined manner during allocation and deallocation. No splitting of blocks takes place, also no effort is made to coalesce adjoining blocks to form larger blocks; when released, a block is simply returned to its free list. When a request is made for m bytes, the allocator first check the free list containing blocks whose size is 2i for the smallest value of i such that 2i ≥ m.if the free list is empty ,it checks the list containing blocks that are higher the next higher power of 2 in size on so on. an entire block is allocated to a request. When a request is made for m bytes. the system finds the smallest power of 2 that is ≥ m. Let this be 2i.if the list is empty, it checks the lists for block of size 2i+1.it takes one block off this list and splits it into two halves of size 2i.it put one of these blocks into the free list of size 2i,and uses the other block to satisfy the request.

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In stack, memory allocation and deallocation is performed in ________.a)Last­-in-­first­-out (LIFO) mannerb)First-­in-­first­-out (FIFO) mannerc)First-­in-­last-­out (FILO) mannerd)Random mannerCorrect answer is option 'A'. Can you explain this answer?
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