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Interview Questions on typecasting in C++ : (9)

Question: 1

Which of the following is the least safe type casting in C++?

(A) static_cast
(B) const_cast
(C) reinterpret_cast
(D) dynamic_cast

Compiler
Level: ExpertCategory: typecasting
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Question: 2

dynamic_cast can be used only with pointers and references to objects

(A) True
(B) False

Compiler
Level: PractitionerCategory: typecasting
[Posted by: | ]

Question: 3

dynamic_cast is always successful when we cast a class to one of its base classes

(A) True
(B) False

Compiler
Level: PractitionerCategory: typecasting
[Posted by: | ]

Question: 4

When dynamic_cast cannot cast a pointer because it is not
a complete object of the required class it returns
a null pointer to indicate the failure

(A) True
(B) False

Compiler
Level: PractitionerCategory: typecasting
[Posted by: | ]

Question: 5

static_cast can perform conversions between pointers
to related classes not only from the derived class to its base,
but also from a base class to its derived

(A) True
(B) False

Compiler
Level: PractitionerCategory: typecasting
[Posted by: | ]

Question: 6

reinterpret_cast converts any pointer type to any other pointer type, even of unrelated classes

(A) True
(B) False

Compiler
Level: PractitionerCategory: typecasting
[Posted by: | ]

Question: 7

const_cast manipulates the constness of an object, either to be set or to be removed

(A) True
(B) False

Compiler
Level: PractitionerCategory: typecasting
[Posted by: | ]

Question: 8

#include<iostream>
using namespace std;

class cppbuzz_base{
    public: 
    
    void hello(){
        cout<<"Hello Base ";
    }
};

class derived: public cppbuzz_base{
    public:
    
    void hello(){
        cout<<"Hello Derived ";
    }
    
};

int main()
{
derived obj;
cppbuzz_base baseObj = cppbuzz_base(obj);
baseObj.hello();
return 0;
}

(A) Hello Derived
(B) Hello Base
(C) Hello Derived Hello Base
(D) Hello Base Hello Derived

Compiler
Level: PractitionerCategory: typecasting
[Posted by: | ]

Question: 9

#include<iostream>
using namespace std;

class cppbuzz_base{
    public: 
    
    void hello(){
        cout<<"Hello Base ";
    }
};

class derived: public cppbuzz_base{
    public:
    
    void hello(){
        cout<<"Hello Derived ";
    }
    
};

int main()
{
cppbuzz_base baseObj;
derived obj = derived(baseObj);
obj.hello();
return 0;
}

(A) Hello Derived
(B) Hello Base
(C) Hello Derived Hello Base
(D) Error: not matching func to call ‘derived::derived(cppbuzz_base&)’

Home » C++ » Questions on typecasting in C++

Interview Questions on typecasting in C++ : (9)

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