C#

Question 1

_______ means “many forms”, and it occurs when we have many classes that are related to each other by inheritance. Inheritance lets us inherit attributes and methods from another class. ________ uses those methods to perform different tasks.

Answer 1

Polymorphism

Question 2

May or may not include ______ methods. Also cannot be instantiated, but they can be subclasses. A method declared without an implementation. If a class includes_____ methods, then the class itself must be declared ______?

Answer 2

Abstract Methods and Classes

Question 3

Abstract type that contains a collection of methods and constant variables. It is one of the core concepts in java, and used to achieve abstraction, polymorphism and multiple inheritances.

Answer 3

Interfaces

Question 4

Two or more methods may have the same name if they differ in parameters(different number of parameters, different types of parameters, or both). These methods are called overloaded methods and this feature is called method ______?

Answer 4

Overloading

Question 5

______ occurs when a subclass (child class) has the same method as the parent class. In other words, ______ occurs when a subclass provides a particular implementation of a method declared by one of its parent classes.

Answer 5

Overriding

Question 6

This function or method type in an OOP language is used to override the behavior of the function or method in an inherited class with the same signature to achieve the polymorphism.

Answer 6

Virtual Method

Question 7

ways of parameter passing, one way doesn’t require initialization.

Answer 7

out, in, ref

Question 8

Is a concept that acquires the properties from one class to other classes; for example, the relationship between father and son. Is a process of acquiring all the behaviors of a parent object.

Answer 8

Inheritance

Question 9

A _____ between two objects associated with each other exists when there is a strong relationship between one class and another. Other classes cannot exist without the owner or parent class.

Answer 9

Composition

Question 10

Is a keyword for creating a structure that contains variables, methods, different types of constructors, operators, etc. It is similar to classes that hold different types of data and has a value type. It creates objects which require less memory.

Answer 10

Struct

Question 11

A template definition of the methods and variables in a particular kind of object. Thus, an object is a specific instance of this. Is one of the defining ideas of object-oriented programming.

Answer 11

Class

Question 12

Is a method that is not bound to an identifier. Often used as arguments being passed to higher-order functions or used for constructing the result of a higher-order function that needs a return method.

Answer 12

Anonymous Method

Question 13

Simply passing a duty off to someone or something else. Can be an alternative to inheritance. Means you use an object of another class an an instance variable, and forwards messages to the instance.

Answer 13

Delegates

Question 14

Used for the export of variables, methods, and resources by name.

Answer 14

DLL(Dynamic Link Library)

Question 15

managed .NET assemblies created using third-party tools and usually contains .NET code that can only access .NET supported libraries.

Answer 15

Managed plugins

Question 16

platform-specific native code libraries. They are used to access third-party code libraries that would normally not be available to Unity otherwise.

Answer 16

Native plugins

Question 17

Can threads be used to modify a texture on runtime?

Answer 17

No, texture and meshes are examples of elements stored in GPU memory and Unity doesn’t allow other threads, besides the main one, to make modifications on these kinds of data.

Question 18

can threads be used to move a GameObject in the scene?

Answer 18

no, fetching the transform reference isn’t thread safe in Unity.

Question 19

class RandomGenerator : MonoBehaviour
{
    public float[] randomList;

    void Start()
    {
        randomList = new float[1000000];
    }

    void Generate()
    {
        System.Random rnd = new System.Random();
        for(int i=0;i

Answer 19

class RandomGenerator : MonoBehaviour
{
    public float[] randomList;

    void Start()
    {
        randomList = new float[1000000];
        Thread t = new Thread(delegate()
        {
            while(true)
            {
                Generate();
                Thread.Sleep(16); // trigger the loop to run roughly every 60th of a second
            }            
        });
        t.Start();
    }

    void Generate()
    {
      System.Random rnd = new System.Random();
      for(int i=0;i

Question 20

Define primitive data types?

Answer 20

Primitive data types are predefined data types such as byte, sbyte, int, uint, short, ushort, long, ulong, float, double, char, bool, object, string, decimal.

Question 21

What is unsigned vs signed variables?

Answer 21

only numerical variables have signed vs unsigned types. Unsigned is 0 to max. Signed is -min to -max.

Question 22

what are non-primitive data types?

Answer 22

non-primitive data types are user-defined data types such as enum, class, etc.

Question 23

Explain the difference between an object and a structure?

Answer 23

Generally speaking, objects bring the full object oriented functionality (methods, data, virtual functions, inheritance, etc, etc) whereas structs are just organized memory. Structs may or may not have support for methods / functions, but they generally won’t support inheritance and other full OOP features.

Question 24

Are you familiar with 3D math well enough to answer questions about it? If they ask you simple vector math questions like how to find the direction from vector A to Vector B could you answer that?

Answer 24

To find the vector between point A and point B, merely subtract the two vectors to get an angled vector pointing between the two points.

Question 25

Define an array with random values, then have it sort incrementally and decrementally.

Answer 25

int[] intArray = new int[] { 9, 2, 4, 3, 1, 5 };
//print array
Array.Sort(intArray);
//print array
Array.Reverse(intArray);
//print array

Question 26

How would you return the sum of a large collection of ints?

Answer 26

Use a long 64-bit value.

Question 27

what is wrong with an if statement like this?

if (computeRelVelocity(a, b) && needToCheck)

This lets me know if someone understands basic evaluation…

Question 28

How to instantiate a class in C#?

Answer 28

Use the new operator to instantiate a class in C#.

Let’s say our class is Line. Instantiation will create a new object as shown below −

Line line = new Line();

Using the object, you can now call the method −

line.setLength(6.0);

Let us see the example −

Example

using System;

namespace LineApplication {
   class Line {
      private double length; // Length of a line

      public Line() {
         Console.WriteLine("Object is being created");
      }
      public void setLength( double len ) {
         length = len;
      }
      public double getLength() {
         return length;
      }

      static void Main(string[] args) {
         Line line = new Line();

         // set line length
         line.setLength(6.0);
         Console.WriteLine("Length of line : {0}", line.getLength());
      }
   }
}

Question 29

What is the difference in reference types vs values types c#?

Answer 29

• A Value Type holds the data within its own memory allocation on the stack.
• A Reference Type contains a pointer to another memory location that holds the real data on the heap.

Question 30

This happens when you perform an operation with a data type and the result of this operation exceeds the size of a storage for this datatype. For example, when you add two large 32-bit integers together and the result cannot fit into Int32?

Answer 30

Arithmetic overflow