46. What does derived class does not inherit from the base class?

1. 1. friends

   
   
   

   2. operator = () members

   
   
   

   3. constructor and destructor

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   The derived class inherits everything from the base class except the given things.

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47. What is meant by polymorphism?

1. 1. class having only single form

   
   
   

   2. class having two forms

   
   
   

   3. class having many forms

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Polymorphism is literally meant class having many forms.

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48. Which classes are called as mixin?

1. 1. Standard logging stream

   
   
   

   2. Represent a secondary design

   
   
   

   3. Classes express functionality which represent responsibilities

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   A class that expresses functionality rather than its primary design role is called a mixin.

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49. What is the use of clog?

1. 1. Input stream

   
   
   

   2. Standard logging stream

   
   
   

   3. Error stream

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   clog is an object of class ostream that represents the standard logging stream. It is associated with the cstdio stream stderr, like cerr.

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50. What is the output of this program?
    

    #include <iostream>
        #include <sstream>
        using namespace std;
        int main()
        {
            stringstream strstream(ios :: in | ios :: out);
            std :: string data("The double value is : 12.25 .");
            strstream.str(data);
            strstream.seekg(-5, ios :: end);
            double value;
            strstream >> value;
            value = value*value;
            strstream.seekp(-5,ios::end);
            strstream << value;
            std :: string new_value = strstream.str();
            cout << new_value;
            return 0;
        }
    

1. 1. 12.25

   
   
   

   2. Compilation Error

   
   
   

   3. 120.0625

   
   
   

   4. Runtime Error

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   In this program, We have used the string hierarchy to compute the square of the number.

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