Tag: programming languages

Questions Related to programming languages

Considereing int take 2 bytes of memory. What is size of memory allocated for ob in the below program.the size of memory allocated for object of class class my_class { int x; int y; public: void add(int k); void display(); }; my_class ob;
technology programming languages

  1. 4 bytes

  2. 6 bytes

  3. 8 bytes

  4. 12 bytes

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Correct Option: A

What is abstract class?
technology programming languages

  1. A class which can not be inherited

  2. A class which can have only single object

  3. A class which can not have any objects

  4. A class which can not inherit other classes

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Correct Option: C

How is dynamic binding achieved in C++?
technology programming languages

  1. Using virtual functions

  2. Using method overloading

  3. Using operator overloading

  4. Using both method & operator overloading

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Correct Option: A

Which of the following statement(s) is(are) correct?
technology programming languages

  1. constructors can be virtual

  2. destructors can be virtual

  3. constructors can be overloaded

  4. virtual functions are fast in execution

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Correct Option: B,C

void func(){ double d; static int si; int i; }; where will be memory allocated for the variables?
technology programming languages

  1. all(d,si,i) in stack

  2. d in stack;si in heap;i in stack

  3. d in stack;si in stack;i in heap

  4. d in heap;si in heap;i in stack

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Correct Option: B

Which of the following statment(s) is(are) true for constructors & destructors
technology programming languages

  1. constructors are executed only(once) when the first object is instantiated

  2. destructor is executed only at the end of main() execution

  3. constructors are executed on every object instantiation

  4. destructor is executed when all the objects of the class moves out of scope

  5. constructors can not take parameters

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Correct Option: C

int he below code, which declaration hold for copy constructor? class C{ int x; public: C(int t);//-----> (1) C(C t); //-----> (2) C(C& t); //-----> (3) C(C t, int k);// ------> (4) };
technology programming languages

  1. (1)

  2. (2)

  3. (3)

  4. (4)

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Correct Option: B,C

What is singleton class?
technology programming languages

  1. that can not be inherited

  2. that can be inherited only once

  3. that can have only one object

  4. there is no such class

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Correct Option: C

which of the below statemen(s)is(are) true for malloc() & new functions?
technology programming languages

  1. malloc is used to allocate store for integer arrays only

  2. new is used to allocate store for objects only

  3. new is used to allocate any kind of memory

  4. malloc is used to allocate any kind of memory

  5. new initializes the store after allocation

  6. malloc intializes the store after allocation

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Correct Option: C,D

Pass by reference and Pass by address are same in C++.
technology programming languages

  1. True

  2. False

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Correct Option: A