C++ miscellaneous
practice.

What does the size of the vector refers to in c++?

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

#include <iostream>
#include <array>
 
using namespace std;
 
int main(int argc, char const *argv[])
{
	array<int, 10> arr1 = {1,2,3,4,5};
	array<int, 5> arr2 = {6,7,8,9,10};
	arr1.swap(arr2);
	for(int i=0;i<5;i++)
		cout<<arr1[i]<<" ";
	cout<<endl;
	for(int i=0;i<5;i++)
		cout<<arr2[i]<<" ";
	cout<<endl;
	return 0;
}

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

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

#include <iostream>
using namespace std;
class vec
{
    public:
    vec(float f1, float f2) 
    {
        x = f1;
        y = f2;
    }
    vec()
    {
    }
    float x;
    float y;
};
vec addvectors(vec v1, vec v2);
int main() 
{
    vec v1(3, 6);
    vec v2(2, -2);
    vec v3 = addvectors(v1, v2);
    cout << v3.x << ", " << v3.y << endl;
}
vec addvectors(vec v1, vec v2)
{
    vec result;
    result.x = v1.x + v2.x;
    result.y = v1.y + v2.y;
    return result;
};

The destination statement for the goto label is identified by what label?

Given below classes which of the following are the possible row entries in vtable of D2 class?

class Base
{
    public:
    virtual void function1() {};
    virtual void function2() {};
};
class D1: public Base
{
    public:
    virtual void function1() {};
};
class D2: public Base
{
    public:
    virtual void function2() {};
};

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

#include <iostream>
using namespace std;
int main () 
{
    char str[] = "Steve jobs";
    int val = 65;
    char ch = 'A';
    cout.width (5);
    cout << right;
    cout << val << endl;
    return 0;
}

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

#include <iostream>
using namespace std; 
template <class T>
T max (T &a, T &b)
{
	cout << "Template Called ";
    return (a > b)? a : b;
}
 
template <>
int max <int> (int &a, int &b)
{
    cout << "Called ";
    return (a > b)? a : b;
}
 
int main ()
{
    int a = 10, b = 20;
    cout << max <int> (a, b);
}

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;
}

To use command line arguments in C++, how many parameters are passed to the main function?

What is the correct syntax of declaring an array class?

Which is similar to template specialization?

Pick the correct statement.

Pick out the correct statement about sequence point.

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

#include <iostream>
using namespace std;
class Base
{
    public:
    virtual void print() const = 0;
};
class DerivedOne : virtual public Base
{
    public:
    void print() const
    {
        cout << "1";
    }
};
class DerivedTwo : virtual public Base
{
    public:
    void print() const
    {
        cout << "2";
    }
};
class Multiple : public DerivedOne, DerivedTwo
{
    public:
    void print() const
    {
        DerivedTwo::print();
    }
};
int main()
{
    Multiple both;
    DerivedOne one;
    DerivedTwo two;
    Base *array[ 3 ];
    array[ 0 ] = &both;
    array[ 1 ] = &one;
    array[ 2 ] = &two;
    for ( int i = 0; i < 3; i++ )
    array[ i ] -> print();
    return 0;
}

What happens when only one argument is supplied to reset() function?

Which of the follwoing function(s) of Array classes are similar to [] operator?

Where does the vector add the item?

What is the name of the myfile2 file after executing the following C++ code?

#include <stdio.h>
int main ()
{
    int result;
    char oldname[] = "myfile2.txt";
    char newname[] = "newname.txt";
    result = rename(oldname, newname );
    if (result == 0)
        puts ( "success" );
    else
        perror( "Error" );
    return 0;
}

Which type of relationship is modelled by Association?