C++ miscellaneous
practice.

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

#include <iostream>
using namespace std;
double division(int a, int b)
{
    if (b == 0)
    {
        throw "Division by zero condition!";
    }
    return (a / b);
}
int main ()
{
    int x = 50;
    int y = 0;
    double z = 0;
    try 
    {
        z = division(x, y);
        cout << z << endl;
    }
    catch (const msg) 
    {
        cerr << msg << endl;
    }
    return 0;
}

Which of the following is correct syntax of making heap from a vector v?

What is mandatory for designing a new container?

Pick out the incorrect method in non-modifying sequence algorithm?

What do container adapter provide to interface?

Given the below class, what is the correct syntax of declaring a functor that adds 10 to each of the passed argument?

class Add
{
	int x;
   public:
	Add(int x){
		this->x = x;
	}
	int operator()(int a){
		return x+a;
	}
};

setprecision requires which of the following header file?

What is the correct syntax of constructing any using assignment operator?

What is random_device?

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

#include <stdexcept>
#include <limits>
#include <iostream>
using namespace std;
void func(int c)
{
    if (c < numeric_limits<char> :: max())
        throw invalid_argument("MyFunc argument too large.");
    else
    {
        cout<<"Executed";
    }
}
int main()
{
    try
    {
        func(256);
    }
    catch(invalid_argument& e)
    {
        cerr << e.what() << endl;
        return -1;
    }
    return 0;
}

Which of the following function is used to get the actual number of elements stored in vector?

What are functors in C++?

How many streams are automatically created when executing a program?

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

#include <iostream>
#include <vector>
using namespace std;
int main ()
{
    vector<int> myvector (3);
    for (unsigned i = 0; i < myvector.size(); i++)
    myvector.at(i) = i;
    for (unsigned i = 0; i < myvector.size(); i++)
    cout << ' ' << myvector.at(i);
    return 0;
}

What is the use of is_array() function in C++?

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

#include <iostream>
#include <new>
using namespace std;
int main ()
{
    int i, n;
    int * p;
    i = 2;
    p= new (nothrow) int[i];
    if (p == 0)
        cout << "Error: memory could not be allocated";
    else
    {
        for (n=0; n<i; n++)
        {
            p[n] = 5;
        }
        for (n = 0; n < i; n++)
            cout << p[n];
        delete[] p;
     }
     return 0;
}

What is the correct syntax of defining function template/template functions?

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

#include <iostream>
using namespace std;
long factorial (long a)
{
    if (a > 1)
        return (a * factorial (a + 1));
    else
        return (1);
}
int main ()
{
    long num = 3;
    cout << num << "! = " << factorial ( num );
    return 0;
}

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

#include <vector> 
#include <algorithm>
#include <iostream>
#include <iterator>
using namespace std;
int square(int i) { return i * i; }
int main()
{
    vector<int> V, V2;
    V.push_back(0);
    V.push_back(1);
    V.push_back(2);
    transform(V.begin(), V.end(), back_inserter(V2), square);
    copy(V2.begin(), V2.end(), ostream_iterator<int>(cout, " "));
    cout << endl;
}

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

#include <iostream>
using namespace std;
class BaseClass 
{
    int x;
    public:
    void setx(int n) 
    {
        x = n;
    }
    void showx() 
    {
        cout << x ;
    }
};
class DerivedClass : private BaseClass
{
    int y;
    public:
    void setxy(int n, int m)
    {
        setx(n);      
        y = m;
    }
    void showxy() 
    {
        showx();       
        cout << y << '\n';
    }
};
int main()
{
    DerivedClass ob;
    ob.setxy(10, 20);
    ob.showxy();
    return 0;
}