Unit 1 Rob

Question 1

What is a variable?

Answer 1

Variables are data values that can change when the user is asked a question, for example, their age.

Question 2

Constants in C#

Answer 2

Constants can NOT change whilst the program is running, e.g const int passMark= 40;

Question 3

What are the most common data types and what it does

Answer 3

boolean - true/false
Character - Single character
date/time - date and/or time
double - a number with a decimal such as 2.3
floating point. a number with a decimal e.g 4.5f
integer - A whole number
string - holds zero or more characters such as letters, numbers, spaces etc.

Question 4

What are the there basic programming constructs:?

Answer 4

Sequence - the order in which instructions occur and are processed (order)

Selection - determines which path a program takes when it is running (IF)

Iteration - is the repeated execution of a section of code, when a program is running(LOOP)

Question 5

What are the four basic programming operators?

Answer 5

Logical - AND OR NOT
Comparison - == = >= < ! =
Assignment - =
Arithmetic - + - * / DIV MOD

Question 6

What is a sequence?

Answer 6

Sequence is the order in which instructions occur and are processed and if no conditions they’re done in order

Question 7

What is a selection?

Answer 7

A selection determines which path a program takes when it is running, so the user is asked a question and if its answer is yes it will do 1 task and if the answer is no it will do another different task depending on the answer something will be done.

Question 8

Iteration

Answer 8

Iteration is the repeated execution of a section of code when a programming is running until its complete (LOOP).

Question 9

What is a logical operator?

Answer 9

AND OR NOT

Question 10

What is a Comparison/relational operator?

Answer 10

== =>= < !=

Question 11

What is an assignment operator?

Answer 11

=

Question 12

What is an arithmetic operator?

Answer 12

+ - * / DIV MOD

Question 13

What is readability?

Answer 13

refers how easy it is to read and understand code

Question 14

What are the different types that help with readability?

Answer 14

Comments
Indentation
Naming

Question 15

What is a comment?

Answer 15

Codes can be used to explain C# and to make it more readable, any text between // and the end of the line is ignored by C# and is just some text to help understand the code, and will not be executed.

Question 16

What is indentation?

Answer 16

Indentation is the space between lines when coding and this saves lots of time while we revisit the code and use it, and this is because it allows the user to read it more quicker and understand it quicker e.g 
IF (you're reading this)
{              
            then stop   
}
Instead of doing this, 
IF (you're reading this) {then stop}
ALL in the same line

Question 17

What is naming?

Answer 17

naming is basically as the name says, give meaningful names to variables, programs etc. because it allows the programmer to read the code faster when he’s searching for a variable than a random variable name.

Question 18

What is a function?

Answer 18

On programming, there are often sections of the program that we want to re-use or repeat, “chunks” of instructions can be given a name, they are called functions and procedures.

Question 19

What is declaring?

Answer 19

A function declaration tells the compiler about a function’s name, return type if any and parameters.

Question 20

What is calling?

Answer 20

When a program calls a function, the program control is transferred to the called function. A called function performs a defined task.

Question 21

What is validation?

Answer 21

Is an automatic computer check to ensure that the data entered is sensible and reasonable, for example the computer can be programmed to only accept numbers between 11 and 16 and that’s called range check.

Question 22

Different types of validation

Answer 22

Length
Presence
Range
Format

Question 23

What is length validation

Answer 23

The computer is programmed to check the data isn’t too short or too long

Question 24

What is presence validation?

Answer 24

The computer checks whether a value is there or not, so maybe != null

Question 25

What is range validation?

Answer 25

The computer checks that a value falls within the specified range, for example the computer can be programmed to accept numbers between 1-100 and it checks if the user did so do that.

Question 26

What is format validation?

Answer 26

Format/data type validation is where the computer is programmed to check the data is in the right format, so int with whole numbers and float with decimals.

Question 27

What is defining?

Answer 27

Defining is actually providing the actual body of the function/variable where as declaring you are only declaring its name, value and if any parameters without the actual body.