C++ miscellaneous
practice.

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

#include <iostream>
#include <iterator>
using namespace std;
int main ()
{
    try {
        double value1, value2;
        istream_iterator<double> eos;       
        istream_iterator<double> iit (cin);   
        if (iit != eos) 
            value1 = *iit;
        iit++;
        if (iit != eos) 
            value2 = *iit;
        cout << (value1 * value2) << endl;
    }
    catch (...) {
        cout << "Unknown exception: " << endl;
    }
    return 0;
}

Which is called on allocating the memory for the array of objects?

What will be the type of output of vector cross product?

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 <int>a1;
	cout<<a1.func(3,2)<<endl;
	cout<<a1.func(3.0,2.0)<<endl;
	return 0;
}

Which keyword is used to declare the min and max functions?

What is the syntax of inheritance of class?

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

#include <stdio.h>
int main ()
{
    FILE * p;
    int c;
    int n = 0;
    p = fopen ("myfile.txt", "r");
    if (p == NULL) 
        perror ("Error opening file");
    else
    {
        do {
            c = getc (p);
            if (c == '$') 
                n++;
        } while (c != EOF);
        fclose (p);
        printf ("%d\n", n);
    }
    return 0;
}

Which function is used to check whether a character is printable on console?

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); }
int main () 
{
    int myints[] = {9, 8, 7, 6, 5};
    vector<int> myvector (myints, myints + 5);
    partial_sort (myvector.begin(), myvector.begin() + 3, myvector.end());
    partial_sort (myvector.begin(), myvector.begin() + 2, myvector.end(), 
    myfunction);
    for (vector<int> :: iterator it = myvector.begin(); it != myvector.end(); ++it)
        cout << ' ' << *it;
    return 0;
}

What may be the name of the parameter that the template should take?

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

#include <iostream>  
#include <algorithm> 
#include <vector> 
 
using namespace std;
 
bool IsOdd (int i) 
{ 
	return (i%2)==1; 
}
 
int main () 
{
  vector<int> v;
 
  for (int i=1; i<=10; ++i) 
  	v.push_back(i);
 
  vector<int>::iterator bound;
  bound = partition (v.begin(), v.end(), IsOdd);
 
  for (vector<int>::iterator it=v.begin(); it!=bound; ++it)
    cout << ' ' << *it;
  cout << '\n';
 
  for (vector<int>::iterator it=bound; it!=v.end(); ++it)
    cout << ' ' << *it;
  cout << '\n';
 
  return 0;
}

Which of the following is correct about the second parameter of the main 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 with magnitude "<<abs(cn)<<" 
        and phase angle "<<arg(cn)<<" is: 
        "<<polar(abs(cn), arg(cn))<<endl;
	return 0;
}

How many types of container classes are there in c++?

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

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
bool IsOdd (int i) 
{
    return (i % 2) == 1; 
}
int main () 
{
    vector<int> myvector;
    for (int i = 1; i < 10; ++i) myvector.push_back(i);
    vector<int> :: iterator bound;
    bound = partition (myvector.begin(), myvector.end(), IsOdd);
    for (vector<int> :: iterator it = myvector.begin(); it != bound; ++it)
        cout << ' ' << *it;
    return 0;
}

Which header file is required to use complex class in your program?

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

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

Which of the following is correct about shift() and cshift()?
1. shift() makes some values of Valarray equal to 0 after shifting by a non-zero number
2. cshift() makes some values of Valarray equal to 0 after shifting by a non-zero number

What kind of object is modifying sequence algorithm?

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

#include <iostream>
using namespace std;
int main ()
{
    int n;
    n = -77;
    cout.width(4); 
    cout << internal << n << endl;
    return 0;
}