Programming fundamentals in C#

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A quiz that aims to check if you understand the basics of programming and Visual Studio.
A score of 30 points+ (out of 60 total) is needed to advance to the next chapter.

In order to declare a local variable you need to provide: *

2 points

Type

Name

Value

Required

In order to use a local variable, it must have a value assigned explicitly. *

1 point

True

False

Required

Which of the following is invalid? *

3 points

'a' - 'b'

1-'a'

1 + 5.1

"a" - "b"

Required

Which of the following are types for whole numbers? *

1 point

int

float

double

decimal

short

byte

Required

Which of the following are types for numbers with a fraction? *

1 point

int

float

double

decimal

short

byte

Required

var number = 4.0f // What type is number? *

1 point

int

float

double

decimal

var

Required

var number = 1 + 4.0f // What type is number? *

1 point

int

float

double

decimal

var

Required

var a = "a"; // what type is a? *

1 point

var

string

char

Required

Console.WriteLine("5 / 2"); // what does this print? *

1 point

"5 / 2"

5 / 2

2.5

Required

Console.WriteLine(5 / 2); // what does this print? *

1 point

5 / 2

2.5

Required

Console.WriteLine(5 / 2.0); // what does this print? *

1 point

5 / 2

2.5

What is git? *

1 point

Code versioning host

Code versioning system

Language for managing deleted code

Which of the following does not belong to git? *

3 points

Working tree

Staging area

Central unit

Repository

Stash

Push area

Required

Which git command is involved for moving files from working directory to staging area? *

1 point

add

commit

push

reset

stash

merge

Which git command is involved for moving files from local to remote repository? *

1 point

add

commit

push

reset

stash

merge

Which git command is involved for moving files from staging area to local repository? *

1 point

add

commit

push

reset

stash

merge

Which command is used to move files to safe place locally for later working with them? *

1 point

add

commit

push

reset

stash

merge

When will merge conflict happen? *

1 point

When branch A has changes that branch B does not (different files)

When branch A has changes that branch B does (different files)

When branch A has changes that branch B does (same files, same place)

When branch A has changes that branch B does not (same files, same place)

Required

Every function must have a return statement. *

1 point

True

False

In order to declare a function you must give it: *

2 points

Return type

Name

Arguments

Access modifier

Required

You have the following piece of code. Refer to the 3 questions below and answer them.

Which of the following is true about Foo and Bar? *

2 points

Bar is invalid because it uses a variable that does not exist

Foo is invalid because a is not static

Bar won't compile because it cannot do anything else after a return statement

Required

FooBar is invalid because: *

2 points

It has no access modifier

It has no return type

It doesn't return anything

It has no arguments

It's not static

Required

What's wrong with function Sum? *

1 point

It's not static

a is already declared in Foo method

Which numbers will return true passed to IsValidNumber function? *

3 points

Required

Which loop is the most appropriate for iterating over an array of numbers? INDEX DOES NOT MATTER *

2 points

for

foreach

while

do while

Which loop is the most appropriate for iterating over an array of string? INDEX DOES MATTER *

2 points

for

foreach

while

do while

Which of the following can stop the loop completely? *

2 points

break

continue

stop

return

Required

Which is not a valid way of declaring array in C#? *

2 points

int[] a = {1, 2, 3}

var a = new int[] {1,2,3}

var a = new [] {1, 2, 3}

All are valid

What will be printed? *

2 points

ASD

Kaisinel

DKaisinel

Aisinel

ASDK

What will the output be? *

1 point

null

NullReferenceException

What will the output be?

1 point

Clear selection

What will the output be? *

1 point

IndexOutOfRangeException

NullReferenceException

What is a breakpoint? *

1 point

A line of code that throws an error

A line of code that you are currently typing at

A line of code that you mark to pause application during debug mode

A line of code that you mark to quit application during debug mode

While debugging in VS, how to go back to the line executed before?

1 point

Click the back button

Drag cursor for line currently being executed to the line you want to go back to

It's impossible to go back to previous line

Clear selection

What is a Watch? *

2 points

A window to observe memory and CPU usage

A window to see local variables

A window to pin expressions of choice

What is the purpose of an Immediate Window? *

2 points

Pin expressions of choice

Run code using your application context while debugging

See local variables

Observe memory and CPU usage

Which best define a stream? *

1 point

File

string

Sequence of bytes

In memory data

File "C://Out.txt" does not exist. What happens if you do: File.WriteAllText("C://Out.txt", "Hello out!"); *

1 point

It will fail with FileNotFoundException

A new empty file will be created

A new file with "Hello out!" will be created

It will fail with NullReferenceException

Which of the following is a way of generating a random number between 0.1 and 0.5 given Random random = new Random(); Note: Presume that all random signatures are correct. *

2 points

random.NextDouble() * 0.5;

random.Next(10, 50) / 100.0

random.Next(10, 50) / 100

Required

Caesar cypher is based on which operation? *

1 point

What could be a reason of 😀 sign appearing as ? instead? *

2 points

Saving string as Unicode

Saving string as ASCII

Saving string as UTF-16

Saving string as UTF-32

Submit

Clear form

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