C++ miscellaneous
practice.

How many parameters does a operator() in a function object shoud take?

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

#include <iostream>
#include <complex>
using namespace std;
int main()
{
	complex <double> cn(3.0, 4.0);
	cout<<"Norm is: "<<norm(cn)<<endl;
	return 0;
}

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

#include <cstdlib>
#include <iostream>
using namespace std;
int main()
{
    cout << RAND_MAX << endl;
}

Which of the following is correct about remove_all_extents() function?

What is the use of includes function in c++?

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

#include <iostream>
#include <cctype>
using namespace std;
int main(int argc, char const *argv[])
{
    char arr[12] = "H3ll0\tW0r1d";
    for(int i=0;i<12;i++)
    {
	cout<<(bool)iscntrl(arr[i]);
    }
}

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

#include <iostream>
#include <functional>
#include <algorithm>
using namespace std;
int main ()
{
    int numbers[] = {10, -20, -30, 40, -50};
    int cx;
    cx = count_if ( numbers, numbers + 5, bind2nd(less<int>(), 0) );
    cout << cx;
    return 0;
}

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(46);
	cout<<(b1^b2);
}

If i1 is Input Iterator and i2 is Output Iterator, then which of the following things are correct?

i) cout<<*i1;
ii) i2 can be used with == operator
iii) *i1 = 1
iv) i2--

Identify the incorrect statement.

To what kind of elements does non-modifying sequence algorithm can be applied?

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

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main () 
{
    int myints[] = { 10, 20, 30 ,40 };
    int * p;
    p = find (myints, myints + 4, 30);
    --p;
    cout << *p << '\n';
    return 0;
}

Which container is used to store elements as key-value pair?

What is the use of has_value() function in any container?

Which of the following header files is required for creating and reading data files?

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

#include <iostream>
using namespace std; 
struct A 
{
    int i;
    char j;
    float f;
    void func();
};
void A :: func() {}
struct B 
{
    public:
    int i;
    char j;
    float f;
    void func();
};
void B :: func() {}
int main() 
{
    A a; B b;
    a.i = b.i = 1; 
    a.j = b.j = 'c';
    a.f = b.f = 3.14159;
    a.func();
    b.func();
    cout << "Allocated"; 
    return 0;
}

Which function allows you to set minimum width for the next input?

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 = 2, ii;
    string ww("A");
    ii = square<int>(i);
    cout << i << ": " << ii;
    cout << square<string>(ww) << ":" << endl;
}

How many categories of iterators are there in c++?

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

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
template<class T>
class A
{
    public:
	T func(T a, T b){
		return a/b;
	}	
};
 
int main(int argc, char const *argv[])
{
	A <float>a1;
	cout<<a1.func(3,2)<<endl;
	cout<<a1.func(3.0,2.0)<<endl;
	return 0;
}