Object Oriented Programming With C++
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- 1.What is the final value of x when the code int x; for(x=0; x<10; x++) {} is run?
- A.
10
- B.
9
- C.
0
- D.
1
- 2.In an assignment statement a=b Which of the following statement is true?
- A.
The variable a and the variable b are equal.
- B.
The value of b is assigned to variable a but the later changes on variable b will not effect the value of variable a
- C.
The value of b is assigned to variable a and the later changes on variable b will effect the value of variable a
- D.
The value of variable a is assigned to variable b and the value of variable b is assigned to variable a.
- 3.Which of the following type of class allows only one object of it to be created?
- A.
Virtual class
- B.
Abstract class
- C.
Singleton class
- D.
Friend class
- 4.Which of the following statements is correct?
- A.
Base class pointer cannot point to derived class.
- B.
Derived class pointer cannot point to base class.
- C.
Pointer to derived class cannot be created.
- D.
Pointer to base class cannot be created.
- 5.Which of the following provides a reuse mechanism?
- A.
Abstraction
- B.
Inheritance
- C.
Dynamic binding
- D.
Encapsulation
- 6.What is the output of the following code char symbol[3]={‘a’,‘b’,‘c’}; for (int index=0; index<3; index++) cout << symbol [index];
- A.
A b c
- B.
“abc”
- C.
Abc
- D.
‘abc’
- 7.The process of building new classes from existing one is called _________.
- 8.If a class C is derived from class B, which is derived from class A, all through public inheritance, then a class C member function can access
- A.
Protected and public data only in C and B.
- B.
Protected and public data only in C.
- C.
Private data in A and B.
- D.
Protected data in A and B.
- 9.To perform stream I/O with disk files in C++, you should
- A.
Open and close files as in procedural languages.
- B.
Use classes derived from ios
- C.
Use C language library functions to read and write data.
- D.
Include the IOSTREAM.H header file.
- 10.Overloading the function operator
- A.
Requires a class with an overloaded operator.
- B.
Requires a class with an overloaded [ ] operator.
- C.
Allows you to create objects that act syntactically like functions.
- D.
Usually make use of a constructor that takes arguments.
- 11.RunTime Polymorphism is achieved by ______
- 12.In C++, dynamic memory allocation is accomplished with the operator ____
- 13.What will be the output of the following C++ code? #include<iostream> using namespace std; class Test { protected: int x; public: Test (int i):x(i) { } void fun() const { cout << "fun() const " << endl; } void fun() { cout << "fun() " << endl; } }; int main() { Test t1 (10); const Test t2 (20); t1.fun(); t2.fun(); return 0; }
- A.
fun() const fun()
- B.
fun() fun() const
- C.
fun() fun()
- D.
fun() const fun() const
- 14.What will be the output of the following C++ code? #include <iostream> using namespace std; int fun(int=0, int = 0); int main() { cout << fun(5); return 0; } int fun(int x, int y) { return (x+y); }
- A.
-5
- B.
0
- C.
10
- D.
5
- 15.What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class A { static int a; public: void show() { a++; cout<<"a: "<<a<<endl; } }; int A::a = 5; int main(int argc, char const *argv[]) { A a; return 0; }
- A.
Segmentation fault
- B.
Error as a private member a is referenced outside the class
- C.
No output
- D.
Program compiles successfully but gives run-time error
- 16.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(); }
- A.
Error
- B.
5
- C.
10
- D.
Segmentation fault
- 17.What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class Box { int capacity; public: Box(int cap){ capacity = cap; } friend void show(); }; void show() { Box b(10); cout<<"Value of capacity is: "<<b.capacity<<endl; } int main(int argc, char const *argv[]) { show(); return 0; }
- A.
Value of capacity is: 10
- B.
Value of capacity is: 100
- C.
Error
- D.
Segmentation fault
- 18.How the template class is different from the normal class?
- A.
Template class generate objects of classes based on the template type
- B.
Template class saves system memory
- C.
Template class helps in making genetic classes
- D.
All of the mentioned
- 19.Which of the following accesses a variable in structure *b?
- A.
B->var;
- B.
B.var;
- C.
B-var;
- D.
B>var;
- 20.The operator used for dereferencing or indirection is ____
- A.
->
- B.
–>>
- C.
*
- D.
&
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