What happens when delete is used for a NULL pointer? int *ptr = NULL; delete ptr;

Related MCQs

• 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; }
• Which of the following is true about new when compared with malloc. 1) new is an operator, malloc is a function 2) new calls constructor, malloc doesn't 3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.
• #include <iostream> using namespace std; int main() { int a; a = 5 + 3 * 5; cout <<a; return 0; }
• class Test { int x; }; int main() { Test t; cout <<t.x; return 0; }
• Which of the following is true about the following program #include <iostream> class Test { public: int i; void get(); }; void Test::get() { std::cout <<"Enter the value of i: "; std::cin >>i; } Test t; // Global object int main() { Test t; // local object t.get(); std::cout <<"value of i in local t: "<<t.i<<'\n'; ::t.get(); std::cout <<"value of i in global t: "<<::t.i<<'\n'; return 0; }
• Predict the output? #include <iostream> using namespace std; class Test { int x; Test() { x = 5;} }; int main() { Test *t = new Test; cout <<t->x; }
• #include<iostream> using namespace std; class X { public: int x; }; int main() { X a = {10}; X b = a; cout <<a.x <<" " <<b.x; return 0; }
• The only integer that can be assigned directly to a pointer is                    
• Which of the following ways are legal to access a class data member using this pointer?
• What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor?