C++ STL Test – 2

1. What will be the output of the following C++ code?

#include <iostream>  
#include <utility>
#include <string>

using namespace std;

int main () 
{
  pair <int,int> p1(1,2);
  pair <int,int> p2(3,4);
  cout<<"Pair(first,second) = ("<<p1.first<<","<<p1.second<<")\n";
  p1.swap(p2);
  cout<<"Pair(first,second) = ("<<p1.first<<","<<p1.second<<")\n";
  return 0;
}

2. Which of the following is correct way of copying the values of pair p1 into other pair p2?

3. Which of the following is the correct syntax of using pair p?

4. Which operator is used to access the first or second element of a pair?

5. What will be the output of the following C++ code?

#include <iostream>  
#include <utility>
#include <string>

using namespace std;

int main () 
{
  pair <int,int> p1(1,2);
  pair <int,int> p2(3,4);
  if(p1 <= p2)
  	cout<<"P1 is small";
  else
  	cout<<"P2 is small";
  return 0;
}

6. What happens if a pair is not initialized?

7. What will be the output of the following C++ code?

#include <iostream>  
#include <utility>

using namespace std;

int main () 
{
  pair p(1,2);
  cout<<"Pair(first,second) = ("<<p.first<<","<<p.second<<")\n";
  return 0;
}

8. Which header file is required to use pair container in your program?

9. Which of the following is the correct syntax of accessing the second element of a pair p?

10. Which of the following is the correct syntax of accessing the first element of a pair p?

11. Which of the following Operator cannot be used with pairs?

12. Which of the following operations can be performed on a pair?

13. What will be the output of the following C++ code?

#include <iostream>  
#include <utility>

using namespace std;

int main () 
{
  pair <int,int>p;
  p = make_pair(1,2);
  cout<<"Pair(first,second) = ("<<p.first<<","<<p.second<<")\n";
  return 0;
}

14. What is a pair?

15. What will be the output of the following C++ code?

#include <iostream>  
#include <utility>

using namespace std;

int main () 
{
  pair <int,int> p(1,2);
  cout<<"Pair(first,second) = ("<<p.first<<","<<p.second<<")\n";
  return 0;
}