Class Test - 30-04-2020 - Back-End Programming MCQ

What is the output of following program?

#include<iostream>
using namespace std;
int x = 1;
void fun()
{
    int x = 2;
    {
        int x = 3;
        cout << ::x << endl;
    }
}
int main()

{
    fun();
    return 0;
}

Which of the following is true about virtual functions in C++.

Which of the following in Object Oriented Programming is supported by Function overloading and default arguments features of C++.

How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Here, one can create a non-dynamic array using int *arr[10]

What is the output of the following program?

#include <iostream>
using namespace std;
int main()
{
   int x = -1;
   try {
      cout << "Inside try \n";
      if (x < 0)
      {
         throw x;
         cout << "After throw \n";
      }
   }
   catch (int x ) {
      cout << "Exception Caught \n";
   }
   cout << "After catch \n";
   return 0;
}

What is the difference between struct and class in C++?

Which of the following operators cannot be overloaded?

A member function can always access the data in __________ .

What is the output of the following program?
#include <iostream>
using namespace std;
 
class Test
{
  int x;
  Test() { x = 5;}
};
 
int main()
{
   Test *t = new Test;
   cout << t->x;
}

Predict the output.

#include<iostream>

using namespace std;
class abc {
   public:
      static int x;
      int i;

      abc() {
         i = ++x;
      }
   };
int abc::x;

main() {
   abc m, n, p;
  
   cout<<m.x<<" "<<m.i<<endl;
}

What should be put in a try block?

1. Statements that might cause exceptions
2. Statements that should be skipped in case of an exception

What is the output of following program?

#include <stdio.h>
int main()
{
   const int x;
   x = 10;
   printf("%d", x);
   return 0;
}

What is the use of this pointer?

What is the built in library function to compare two strings?

Predict the output.

class Test {
    int x;
};
int main()
{
  Test t;
  cout << t.x;
  return 0;
}

What is the output of following program?

#include <iostream>
using namespace std;
int fun(int=0, int = 0);
 
int main()
{
  cout << fun(5);
  return 0;
}
int fun(int x, int y)
{
  return (x+y);
}

Which of the followings is/are automatically added to every class, if we do not write our own?