C++ | new and delete | Question 5

Is it fine to call delete twice for a pointer?

#include<iostream>
using namespace std;

int main()
{
    int *ptr = new int;
    delete ptr;
    delete ptr;
    return 0;
}

(A) Yes
(B) No


Answer: (B)

Explanation: It is undefined behavior to call delete twice on a pointer.

Anything can happen, the program may crash or produce nothing.

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