21. What is the output of this program?
    

1. 1. Ajit Kumar Gupta

   
   
   

   2. Compilation Error

   
   
   

   3. 16

   
   
   

   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 are finding the length of the string.

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22. Which header file is used to manipulate the string?

1. 1. container

   
   
   

   2. iostream

   
   
   

   3. iomanip

   
   
   

   4. string

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   To use the string class, We have to use #include header file.

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23. How many maximum number of parameters does a string constructor can take?

1. 1. 4

   
   
   

   2. 3

   
   
   

   3. 2

   
   
   

   4. 1

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   string( other_string, position, count ). It is a type of constructor for the string.

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24. Which constant member functions does not modify the string?

1. 1. assign

   
   
   

   2. append

   
   
   

   3. bool empty()

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Because bool empty is a constant member function, So it can’t be modified.

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25. What is the output of this program?
    

    #include <iostream>
        #include <string>
        using namespace std;
        int main ()
        {
            string s ("Coding is my life");
            unsigned sz = s.size();
            s.resize (sz + 2, '+');
            s.resize (13);
            cout << s << '\n';
            return 0;
        }
    

1. 1. my life

   
   
   

   2. Coding is my life

   
   
   

   3. Coding is my

   
   
   

   4. Compilation 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 are resizing the string by adding + and then we are resizing it to 13.

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