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.

What happens if you try to free a pointer twice in a row?

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

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 happens if we run the following code?12345678#include <iostream>int main() { int* ptr = new int; ptr = new int; delete ptr; return 0;}Marks : 1Negative Marks : 0Answer hereThe code will not compile due to a syntax error.The code will compile and execute without any issues.The code will compile but result in a memory leak.The code will compile but result in an allocation failure.

What happens if a NULL pointer is dereferenced in C?Marks : 1Negative Marks : 0Answer hereIt will point to a different variableIt will cause a runtime error or crashIt will return 0It will allocate new memory