How many types of class relationships are there in object-oriented programming?

What does ADT stand for?

 Which of the following is illegal? 

int foo = 10;
decltype(foo) bar;

cout << foo;

cout << bar << endl;

all needed library are already included .

​ Which of the following class allows to declare only one object of it?

In the case of friend operator overloaded functions, how many object arguments can a unary operator overloaded function take at maximum?

What is the output of the following C program?

int main()

{

  int arr[10];

  printf("%d", *arr + 5 - *arr + 3);

}

What is the primary purpose of a constructor in object-oriented programming?

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

#include<iostream>
using namespace std;
int x[100];
int main()
{
   cout << x[99] << endl;
}

Here is part of a graphics program that simulates a color fading in the sun. The amount of yellow starts at a maximum of 1.0 and is faded by decreasing it by 1% each time the loop executes until it is close to zero.

float yellowLevel = 1.0;
     while ( yellowLevel > 0.001 )
     {      
        yellowLevel = yellowLevel * 0.99 ;

        // the new yellowLevel is used herein some graphics methods         
     }

Pick a condition for the while statement.