C++ basic questions and answers

1. Which header file is used to manipulate the string?a) iostream
b) iomanip
c) string
d) container

2. How many maximum number of parameters does a string constructor can take?a) 1
b) 2
c) 3
d) 4

3. Which constant member functions does not modify the string?a) bool empty()
b) assign
c) append
d) None of the mentioned

4. What is the output of this program?

1.     #include 

2.     #include 

3.     using namespace std;

4.     int main ()

5.     {

6.         string str ("I like to code in C");

7.         unsigned sz = str.size();

8.         str.resize (sz + 2, '+');

9.         str.resize (14);

10.         cout << str << '\n';

11.         return 0;

12.     }

a) I like to code in c
b) I like to code
c) I like to code in c++
d) None of the mentioned

5. What is the output of this program?

1.     #include 

2.     #include 

3.     using namespace std;

4.     int main ()

5.     {

6.         string str ("Steve jobs");

7.         cout << str.capacity() << "\n";

8.         return 0;

9.     }

a) 9
b) 10
c) 11
d) 12

6. What is the output of this program?

1.     #include 

2.     #include 

3.     using namespace std;

4.     int main ()

5.     {

6.         string str ("Steve jobs founded the apple");

7.         string str2 ("apple");

8.         unsigned found = str.find(str2);

9.         if (found != string :: npos)

10.             cout << found << '\n';

11.         return 0;

12.     }

a) apple
b) 12
c) 23
d) Steve jobs founded the

7. What is the output of this program?

1.     #include 

2.     #include 

3.     using namespace std;

4.     int main ()

5.     {

6.         string str ("Steve jobs");

7.         unsigned found = str.find_first_of("aeiou");

8.         while (found != string :: npos)

9.         {

10.             str[found] = '*';

11.             found = str.find_first_of("aeiou", found + 1);

12.         }

13.         cout << str << '\n';

14.         return 0;

15.     }

a) Steve
b) jobs
c) St*v* j*bs
d) St*v*

8. What is the output of this program?

1.     #include   

2.     #include 

3.     #include 

4.     using namespace std;

5.     int main () 

6.     {

7.         string str ("Steve jobs");

8.         char * cstr = new char [str.length() + 1];

9.         strcpy (cstr, str.c_str());

10.         char * p = strtok (cstr," ");

11.         while (p != 0)

12.         {

13.             cout << p << '\n';

14.             p = strtok(NULL," ");

15.         }

16.         delete[] cstr;

17.         return 0;

18.     }

a) Steve jo
b) Steve jobs
c) Steve
jobs
d) None of the mentioned

9. What is the difference between unsigned int length() and unsigned int size()?a) Returns a different value
b) They are same
c) Both a & b
d) None of the mentioned

10. How many parameters does a resize method can take?a) 1
b) 2
c) 3
d) 4