C++ miscellaneous
practice.

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

#include <iostream>
using namespace std;
template <class T>
inline T square(T x)
{
    T result;
    result = x * x;
    return result;
};
template <>
string square<string>(string ss)
{
    return (ss+ss);
};
int main()     
{
    int i = 4, ii;
    string ww("A");
    ii = square<int>(i);
    cout << i << ii;
    cout << square<string>(ww) << endl;
}

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

#include <iostream>
using namespace std;
int array[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
void swap(int x, int y)
{
    int temp = array[x];
    array[x] = array[y];
    array[y] = temp;
    return;
}
void printArray(int size)
{
    int i;
    for (i = 0; i < size; i++)
        cout << array[i] << " ";
    cout << endl;
    return;
}
void permute(int k, int size)
{
    int i;
    if (k == 0)
        printArray(size);
    else
    {
        for (i = k - 1;i >= 0;i--)
        {
            swap(i, k - 1);
            permute(k - 1, size);
            swap(i, k - 1);
        }
    }
    return;
}
int main()
{
    permute(3, 3);
    return 0;
}

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

#include <iostream>
#include <string>
using namespace std;
class A
{
	int a;
    public:
	virtual void func() = 0;
};
 
class B: public A
{
    public:
	void func(){
		cout<<"Class B"<<endl;
	}	
};
 
int main(int argc, char const *argv[])
{
	A *a;
	a->func();
	return 0;
}

Which of the following is correct about any() function in bitset?

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

#include <iostream>
using namespace std;
class MyInterface 
{
    public:
    virtual void Display() = 0;
};
class Class1 : public MyInterface 
{
    public:
    void Display() 
    {
        int  a = 5;
        cout << a;
    }
};
class Class2 : public MyInterface 
{
    public:
    void Display()
    {
        cout <<" 5" << endl;
    }
};
int main()
{
    Class1 obj1;
    obj1.Display();
    Class2 obj2;
    obj2.Display();
    return 0;
}

How many vector container properties are there in c++?

What is the use of tie() function?

What does this template function indicates?

==================
template<class T>
void func(T a)
{
	cout<<a;
}
==================

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

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
bool myfunction (int i, int j)
{ 
    return (i < j);
}
struct myclass {
bool operator() (int i, int j)
{
    return (i < j);
} 
} myobject;
int main () 
{
    int myints[] = {10, 9, 8};
    vector<int> myvector (myints, myints + 3);
    sort (myvector.begin(), myvector.begin() + 2);
    sort (myvector.begin() + 1, myvector.end(), myfunction);
    sort (myvector.begin(), myvector.end(), myobject);
    for (vector<int> :: iterator it = myvector.begin(); it != myvector.end(); ++it)
        cout << ' ' << *it;
    return 0;
}

What is bitset in C++?

What is another name of full specialization?

What will happen when a programs throws any other type of exception other than specified?

Pick out the correct statement about permutation.

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;
}

Which of the following(s) can be used to access the last element of a vector v?

What is the use of RAII in c++ programming?

Which function is used to check whether a character is a tab or space?

What can be passed by non-type template parameters during compile time?

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

#include <iostream>
#include <exception>
using namespace std;
class myexception: public exception
{
    virtual const char* what() const throw()
    {
        return "My exception";
    }
} myex;
int main () 
{
    try
    {
        throw myex;
    }
    catch (exception& e)
    {
        cout << e.what() << endl;
    }
    return 0;
}

Which header file is required to use tuples in your program?