C++ Constructors

Question 11

Given the programming constructs i)assignment  ii)for loops where the loop parameter cannot be changed within the loop  iii)if-then-else  iv)forward  go to v)arbitrary go to  vi)non-recursive procedure call vii)recursive procedure/function call  viii)repeat loop, which constructs will you not include in a programming language such that it should be possible to program the terminates (i.e. halting) function in the same programming language.

• ii), iii), iv)
• v), vii), viii)
• vi), vii), viii)
• iii), v), viii)

Question 12

Constructors have _____ return type.

• void
• char
• int
• no

Question 13

What is the right way to declare a copy constructor of a class if the name of the class is MyClass?

• MyClass (constant MyClass *arg)
• MyClass (constant MyClass &arg)
• MyClass (MyClass arg)
• MyClass (MyClass *arg)

Question 14

Predict output of the following program 

C

#include <stdio.h>
int main()
{
   printf("\new_c_question\b\r");
   printf("geeksforgeeks"); 
   getchar();
   return 0;
}

• ew_c_question
  geeksforgeeks
  

• new_c_ques
  geeksforgeeks
  

• 
  geeksforgeeks
  

• Depends on terminal configuration

Question 15

Fond out the  time complexity of the program 

int a = 0;  

  for (i = 0; i < N; i++) {

       for (j = N; j > i; j--) {       

              a = a + i + j;      

        }

    }

• O(N^2)

• O(N^2)

• O(2*N)

• O(NlogN)

Question 16

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

• Copy Constructor
• Assignment Operator
• A constructor without any parameter
• All of the above

Question 17

Output of following C++ code will be?

C++

#include <iostream>
using namespace std;

class X 
{
public:
    int x;
};

int main()
{
    X a = {10};
    X b = a;
    cout << a.x << " " << b.x;
    return 0;
}

• Compiler Error

• 10 followed by Garbage Value

• 10 10

• 10 0

Question 18

Output of following program? 

C++

#include <iostream>
using namespace std;

class Point {
    Point() { cout << "Constructor called"; }
};

int main()
{
    Point t1;
    return 0;
}

• Runtime Error

• None of these

• Constructor called

• Compiler Error

Question 19

When a copy constructor may be called?

• When an object of the class is returned by value.
• When an object of the class is passed (to a function) by value as an argument.
• When an object is constructed based on another object of the same class
• When compiler generates a temporary object.
• All of the above

Question 20

C

#include<iostream>
using namespace std;
class Point {
public:
    Point() { cout << \"Constructor called\"; }
};

int main()
{
   Point t1, *t2;
   return 0;
}

• Compiler Error
• Constructor called
  Constructor called
  
• Constructor called