Questions and Answers

Questions and Answers

Easy Questions

C++ Programming

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Questions and Answers
Standard Library
  1. How many sets of requirements are need in designing a container?










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: B

    There are three sets of requirements. They are container interface requirements, Allocator interface requirements and iterator requirements.

  1. What is the output of this program?
    #include <iostream>
        using namespace std;
        struct N 
        {
            virtual void fun()  
            { 
                cout << "Class N" << endl; 
            }
        };
        struct M : N 
        {
            virtual void fun() 
            { 
                cout << "Class M" << endl;
            }
        };
        struct O : N 
        {
            virtual void fun() 
            {
                cout << "Class O" << endl; 
            }
        };
        void fun(N* argumnet) 
        {
            M* ptr1 = dynamic_cast<M*>(argumnet);
            O* ptr2 = dynamic_cast<O*>(argumnet);
            if (ptr1)
                ptr1 -> fun();
            else if (ptr2)
                ptr2 -> fun();
            else
                argumnet -> fun();  
        };
        int main() 
        {
            N Object1;
            O Object2;
            N* ptr1 = &Object2;
            N* ptr3 = &Object1;
            fun(ptr1);
            fun(ptr3);
        }










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: E

    In this program, We applied the dynamic casting to structure and produced the output.

  1. What is meant by type_info?










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: C

    Used to hold the type information returned by the typeid operator

  1. At which time does the static_cast can be applied?










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: B

    Static_cast can be applied to only compile-time construct and not during run time construct.

  1. What is the output of this program?
    #include <typeinfo>
        #include <iostream>
        using namespace std;
        class N
        {
            public:
            virtual ~N();
        };
        int main() 
        {
            N* ptr = NULL;
            try 
            {
                cout << typeid(*ptr).name() << endl; 
            }
            catch (bad_typeid)
            {
                cout << "Object is NULL" << endl;
            }
        }










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: D

    In this program, We are using the bad typeid() for a. So it is arising an exception.