Question

A.2 5 pts - VWhat is a dangling/stale pointer? And please give code example [Yes ]No Does delete delete a pointer? Please explain why. Then please give instructions how to properly deallocate an object allocated on Free-Store. Please ample to demonstrate. use a code

Answer 1

`Hey,

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A pointer pointing to a memory location that has been deleted (or freed) is called dangling pointer.

// Deallocating a memory pointed by ptr causes

// dangling pointer

#include <stdlib.h>

#include <stdio.h>

int main()

{

    int *ptr = (int *)malloc(sizeof(int));

  

    // After below free call, ptr becomes a

    // dangling pointer

    free(ptr);

      

    // No more a dangling pointer

    ptr = NULL;

}

2)

Yes,

• New operator is used for dynamic memory allocation which puts variables on heap memory.
• Which means Delete operator deallocates memory from heap.
• Pointer to object is not destroyed, value or memory block pointed by pointer is destroyed.

deleting memory dynamically allocated by malloc

#include <bits/stdc++.h>

using namespace std;

  

int main()

{

    // Dynamic memory allocated by using malloc

    int* ptr2 = (int*)malloc(sizeof(int));

  

    delete ptr2;

  

    cout << "ptr2 deleted successfully";

  

    return 0;

}

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