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Distinguish between Array and Pointers

Question

Distinguish between Array and Pointers

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Solution

Sure, here is a step by step distinction between Arrays and Pointers:

  1. Definition:

    • Array: An array is a collection of items stored at contiguous memory locations. The items are of the same data type.
    • Pointer: A pointer is a variable that stores the memory address of another variable.

  2. Memory Allocation:

    • Array: Memory allocation for an array is done at compile time, which means the size of an array is fixed.
    • Pointer: Memory allocation for a pointer is done at runtime, which means the size can be changed.

  3. Flexibility:

    • Array: Arrays are less flexible as you cannot change the size or the data type of elements once it is declared.
    • Pointer: Pointers are more flexible as they can point to any type of data and also the memory block size can be changed at runtime.

  4. Element Access:

    • Array: Elements in an array can be accessed directly by their index.
    • Pointer: Elements in a pointer need to be accessed by dereferencing the pointer.

  5. Arithmetic Operations:

    • Array: Arithmetic operations cannot be performed on arrays.
    • Pointer: Arithmetic operations can be performed on pointers.

  6. Value Modification:

    • Array: The whole array can be passed to a function, but the changes made to the array elements in the function do not reflect in the original array.
    • Pointer: A pointer can be passed to a function and the changes made to the value pointed by the pointer in the function reflect in the original value.

  7. Keyword Usage:

    • Array: The '[]' is used to declare an array.
    • Pointer: The '*' is used to declare a pointer.

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