Constructors And Destructors In C Plus Plus — Part 2 MCQs with Explanations

Error is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class A{ int a; public: A(int i){ a = i; } void assign(int i){ a = i; } int return_value(){ return a; } }; int main(int argc, char const *argv[]) { A obj; obj.assign(5); cout<<obj.return_value(); }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

3 is the correct answer to “How many types of constructors are there in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Error is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ A(){ cout<<"Constructor called"; } }; int main(int argc, char const *argv[]) { A a; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Nothing printed is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ public: int a; A(){ cout<<"Constructor called"; } }; int main(int argc, char const *argv[]) { A *a1 = (A*)malloc(sizeof(A)); return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

All of the mentioned is the correct answer to “Which of the following constructors are provided by the C++ compiler if not defined in a class”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Nothing printed is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ public: A(){ cout<<"Constructor called"; } }; int main(int argc, char const *argv[]) { A *a; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

010 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ public: int a; A(int a=0){ this->a = a; } }; int main(int argc, char const *argv[]) { A a1, a2(10); cout<<a2.a; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Constructor called is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ public: int a; A(){ cout<<"Constructor called"; } } a; int main(int argc, char const *argv[]) { return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Compile time error is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ public: int a; A(int a){ this->a = a; } }; int main(int argc, char const *argv[]) { A a1, a2(10); cout<<a2.a; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A's default constructor called B's Constructor called A's default constructor called B's Constructor called is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class A{ mutable int a; public: A(){ cout<<"A's default constructor called\n"; } A(const A& a){ cout<<"A's copy Constructor called\n"; } }; class B{ A obj; public: B(){ cout<<"B's Constructor called\n"; } }; int main(int argc, char const *argv[]) { B b1; B b2; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

All of the mentioned is the correct answer to “Why constructors are efficient instead of a function init() defined by the user to initialize the data members of an object”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Error is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ A(){ cout<<"A's Constructor called\n"; } }; class B { public: A a; B(){ cout<<"B's constructor called\ns"; } }; int main(int argc, char const *argv[]) { B b; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A constructor to initialize an object with the values of another object is the correct answer to “What is a copy constructor”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

All of the mentioned is the correct answer to “When a copy constructor is called”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A a = A(5) is the correct answer to “Which of the following represents the correct explicit call to a constructor of class A? class A{ int a; public: A(int i) { a = i; } }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Error is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ ~A(){} }; class B { public: A a; }; int main(int argc, char const *argv[]) { B b; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

0 is the correct answer to “How many parameters does a default constructor require”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

1 is the correct answer to “In the following C++ code how many times the string "A's constructor called" will be printed? #include <iostream> #include <string> using namespace std; class A{ int a; public: A(){ cout<<"A's constructor called"; } }; class B{ static A a; public: B(){ cout<<"B's constructor called"; } static A get(){ return a; } }; A B::a; int main(int argc, char const *argv[]) { B b; A a1 = b.get(); A a2 = b.get(); A a3 = b.get(); }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

To destroy an object when the lifetime of an object ends is the correct answer to “What is the role of destructors in Classes”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

~A(){} is the correct answer to “What is syntax of defining a destructor of class A”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Compiler provides a default constructor to avoid faults/errors is the correct answer to “What happens if a user forgets to define a constructor inside a class”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

1010 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ public: int a; }; int main(int argc, char const *argv[]) { A a1 = {10}; A a2 = a1; cout<<a1.a<<a2.a; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Constructor called Main function is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ public: int a; A(){ cout<<"Constructor called\n"; } } a; int main(int argc, char const *argv[]) { cout<<"Main function\n"; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Error is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class A{ int a; A(){ a = 5; } public: void assign(int i){ a = i; } int return_value(){ return a; } }; int main(int argc, char const *argv[]) { A obj; obj.assign(10); cout<<obj.return_value(); }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A's Constructor called A's Constructor called B's Constructor called B's Destructor called A's Destructor called A's Destructor called is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class A{ mutable int a; public: A(){ cout<<"A's Constructor called\n"; } ~A(){ cout<<"A's Destructor called\n"; } }; class B: public A{ A a; public: B(){ cout<<"B's Constructor called\n"; } ~B(){ cout<<"B's Destructor called\n"; } }; int main(int argc, char const *argv[]) { B b1; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A's Constructor called B's constructor called is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ A(){ cout<<"A's Constructor called\n"; } friend class B; }; class B { public: A a; B(){ cout<"B's constructor called\ns"; } }; int main(int argc, char const *argv[]) { B b; return 0; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

To initialize the data members of an object when it is created is the correct answer to “What is the role of a constructor in classes”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

1 is the correct answer to “How many Destructors are allowed in a Class”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.