Basic

Question 1

What a tuple and why are they useful?

Answer 1

Tuples are used to store multiple items in a single variable. They are useful for returning multiple results from a function.

Question 2

What is string builder and why is it used?

Answer 2

The string builder is a class of .NET to work with strings when repetitive operations are needed. It can improve the performance of code as it is faster than string

Question 3

How can you prevent the silent overflow of integers?

Answer 3

It can be achieved via the project settings or by using checked()

Question 4

What is a method body?

Answer 4

It contains the instructions that implement the method

Question 5

When does the .NET garbage collector run? What does it do?

Answer 5

It is used to free memory space, it runs whenever the heap starts filling up

Question 6

What is method overloading?

Answer 6

When multiple methods are created with the same name in same class but they work in different ways (different data types in method returns)

Question 7

What is an Enum and why would you use it?

Answer 7

Enum is a special “class” that represents a group of constants. It makes values more readable making it less complex

Question 8

What is casting?

Answer 8

When the datatype of a variable is changed.

Question 9

What is an exception?

Answer 9

When a error occurs during the runtime.

Question 10

What is meant by a “Strongly Typed Language”?

Answer 10

It is in which type of data is predefined as of the programming language and all constants or variables defined for the program must be assigned with one of these datatypes.

Question 11

Why is c# described as memory safe?

Answer 11

C# supports static typing meaning that the language enforces type safety at compile time. It prevent a string type being interacted with as though it were an interger type

Question 12

What is .NET?

Answer 12

.NET is an open source developer platform, it can build different types of applications and uses multiple languages.

Question 13

What is a conditional breakpoint?

Answer 13

They allow you to break inside a code block when a defined expression evaluates to true.

Question 14

In handling exceptions, when is the finally block run?

Answer 14

It always executes when try block exits.

Question 15

In a method signature, what does the void keyword mean?

Answer 15

The void keyword indicates that this method has no return value

Question 16

What is an out parameter?

Answer 16

The out parameter is used to pass arguements to methods by reference

Question 17

What is the difference between an array and a list?

Answer 17

Lists are containers for elements having differing data types but arrays are containers for the same data type. New elements can be added to a list

Question 18

What is the difference between a multidimensional array and a jagged array?

Answer 18

In a multidimensional array, each element in each dimension has the same size as the other elements in that dimension. In a jagged array, which is an array of arrays, each inner array can be of different size.

Question 19

Which types of operator have the lowest priority?

Answer 19

Assignment (=, +=, -=, *=, /=, %=)

Question 20

Which types of operator have the highest priority?

Answer 20

Postfix, increment and decrement (++,–)

Question 21

What are method parameters passed by value?

Answer 21

Numeric types(integral and floating), char, bool, enum, struct.

Question 22

What are method parameters passed by reference?

Answer 22

String, object, dynamic

Question 23

What’s compile time and run time?

Answer 23

Compile time is the period when the programming code is converted to machine code. Runtime is the period of time the program is running.

Question 24

Why is representing dates and times complicated?

Answer 24

Finding the difference between 2 dates is difficult. Leap year and formatting due different types display dates