In C++, which of the following statements differentiate between delete and free:The delete is an operator that de-allocates the memory dynamically while the free() is a function that destroys the memory at the runtime.The delete operator is used to delete the pointer, which is either allocated using new operator or a NULL pointer, whereas the free() function is used to delete the pointer that is either allocated using malloc(), calloc() or realloc() function or NULL pointer.When the delete operator destroys the allocated memory, then it calls the destructor of the class in C++, whereas the free() function does not call the destructor; it only frees the memory from the heap.The free() operator is faster than the delete() function.1, 2, and 32, 3, and 41, 3, and 4All of these
Question
In C++, which of the following statements differentiate between delete and free:The delete is an operator that de-allocates the memory dynamically while the free() is a function that destroys the memory at the runtime.The delete operator is used to delete the pointer, which is either allocated using new operator or a NULL pointer, whereas the free() function is used to delete the pointer that is either allocated using malloc(), calloc() or realloc() function or NULL pointer.When the delete operator destroys the allocated memory, then it calls the destructor of the class in C++, whereas the free() function does not call the destructor; it only frees the memory from the heap.The free() operator is faster than the delete() function.1, 2, and 32, 3, and 41, 3, and 4All of these
Solution
The correct answer is 1, 2, and 3.
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The delete operator in C++ is used to de-allocate memory that was previously allocated using the new operator. On the other hand, the free() function is used to destroy memory during runtime that was allocated using malloc(), calloc(), or realloc().
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The delete operator can be used to delete a pointer that was allocated using the new operator or a NULL pointer. The free() function can be used to delete a pointer that was allocated using malloc(), calloc(), or realloc() or a NULL pointer.
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When the delete operator is used, it calls the destructor of the class in C++, whereas the free() function does not call the destructor; it only frees the memory from the heap.
The fourth statement is incorrect because the speed of delete and free can depend on various factors and it's not accurate to say that free() is always faster than delete.
Similar Questions
Which of the following correctly deallocates memory allocated for an array in C++?delete ptr;delete[] ptr;free(ptr);delete array ptr;
What will be the result of the following code snippet?int main() { int *ptr1, *ptr2; ptr1 = (int *)malloc(sizeof(int)); ptr2 = (int *)malloc(sizeof(int)); *ptr1 = 42; *ptr2 = *ptr1; free(ptr1); printf("%d\n", *ptr2); free(ptr2); return 0;}
What is the purpose of the 'delete' operator in C++?To delete variables from the stackTo free dynamically allocated memoryTo remove values from an arrayTo terminate the process
What happens if you try to free a pointer twice in a row?The program will crash.The program will continue to run normally.Undefined behavior.The memory will be freed twice.
Which of the following statements is true regarding calloc? Marks : 1Negative Marks : 0Answer hereIt only allocates memory for integersIt does not require the free function to deallocate memoryIt can allocate memory of any type and numberIt always allocates a fixed size of memory
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