C++ miscellaneous
practice.

Which header file is used for generating random numbers?

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

#include<iostream>
using namespace std;
class X 
{
    int m;
    public:
    X() : m(10)
    {                                                       
    }
    X(int mm): m(mm)
    {
    }
    int getm()
    {
        return m;
    }
};
class Y : public X 
{
    int n;
    public:
    Y(int nn) : n(nn) {}                                                
    int getn() { return n; }
};
int main()
{
    Y yobj( 100 );
    cout << yobj.getm() << " " << yobj.getn() << endl;
}

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

#include <iostream>
#include <bitset>
using namespace std;
int main()
{
	bitset<8> b1(95);
	bitset<8> b2(45);
	cout<<~b1<<endl;
	cout<<(b1|b2)<<endl;
	cout<<(b1&b2)<<endl;
}

Which function is used to check whether a character is a number?

How many kinds of parameters are there in C++?

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

#include <iostream>
#include <functional>
#include <numeric>
using namespace std;
int myfunction (int x, int y) 
{
    return x + 2 * y;
}
struct myclass 
{
    int operator()(int x, int y) 
    {
        return x + 3 * y;
    }
} myobject;
int main () 
{
    int init = 100;
    int numbers[] = {10, 20, 30};
    cout << accumulate(numbers, numbers + 3, init);
    cout << endl;
}

Which is used to get the input during runtime?

What is meant by pure virtual function?

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

#include <iostream>
#include <complex>
using namespace std;
int main()
{
	complex <double> cn(3.0, 5.0);
	cout<<"Complex number is: "<<real(cn)<<" + "<<imag(cn)<<"i"<<endl;
	return 0;
}

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

#include <iostream>
using namespace std;
class poly
{
    protected:
    int width, height;
    public:
    void set_values(int a, int b)
    {
        width = a; height = b;
    }
};
class Coutput
{
    public:
    void output(int i);
};
void Coutput::output(int i)
{
    cout << i;
}
class rect:public poly, public Coutput
{
    public:
    int area()
    {
        return(width * height);
    }
};
class tri:public poly, public Coutput
{
    public:
    int area()
    {
        return(width * height / 2);
    }
};
int main()
{
    rect rect;
    tri trgl;
    rect.set_values(3, 4);
    trgl.set_values(4, 5);
    rect.output(rect.area());
    trgl.output(trgl.area());
    return 0;
}

Which of the following is correct about Input Iterators?

How many types of sequence operations are provided by the C++ algorithm STL?

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

#include <iostream>
#include <memory>
#include <string>
using namespace std;
int main ()
{
    string numbers[] = {"steve", "jobs"};
    pair <string*, ptrdiff_t> result = get_temporary_buffer<string>(2);
    if (result.second>0) 
    {
        uninitialized_copy ( numbers, numbers + result.second, result.first );
        for (int i = 0; i < result.second; i++)
            cout << result.first[i] << " ";
       return_temporary_buffer(result.first);
    }
    return 0;
}

What kind of iteration does forward_list provide in C++?

Which of the following header file is needed to use vectors in your program?

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

#include <string>
#include <iostream>
using namespace std;
void string_permutation( string& orig, string& perm )
{
    if (orig.empty())
    {
        cout<<perm<<endl;
        return;
    }
    for (int i = 0; i < orig.size(); ++i)
    {
        string orig2 = orig;
        orig2.erase(i, 1);
        string perm2 = perm;
        perm2 += orig.at(i);
        string_permutation(orig2, perm2);
    }
}
int main()
{
    string orig = "ter";
    string perm;
    string_permutation(orig, perm);
    return 0;
}

What type of class template is list?

Pick out the correct statement about vector.

How do define the user-defined exceptions?

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

#include <iostream>
#include <vector>
using namespace std;
int main ()
{
    vector<int> first;
    first.assign (7,100);
    vector<int>::iterator it;
    it=first.begin()+1;
    int myints[] = {1776,7,4};
    cout << int (first.size()) << '\n';
    return 0;
}