Intro Week 5

Enum

More complex variable types but very useful ways of defining data.

enum

enumerations allow us to define data that can take a fixed set of results.

<syntaxhighlight lang="csharp" line="1" > enum direction {north, east, south, west}; </csharp> <syntaxhighlight lang="csharp" line="1" > enum difficulty {novice =1, easy =5, normal =10, hard =15, unbeatable =25}; </csharp>

Or we can use months

<syntaxhighlight lang="csharp" line="1" >//another more useful example // forced sequence to start // from 1 instead of 0 (default) enum Months

 {
   January = 1, February , March, April ,
   May , June , July , August , Sept , Oct , Nov , Dec 
 }</csharp>

To write out the name of month we can use the enumerator <syntaxhighlight lang="csharp" line="1" > Console.WriteLine(Months.February); Console.WriteLine( (Months)3 ); </csharp>

Array

Groups of that same type of variable

A group of strings

<syntaxhighlight lang="csharp" line="1" > string[] names; //delcare an array of strings names = new string[4]; //initialize the array

//set the values in the array names[0] = "Cheryl"; names[1] = "Joe"; names[2] = "Matt"; names[3] = "Robert";

</csharp>

for each

A for each loop requires and iterator.. more on this iterator thing later...

<syntaxhighlight lang="csharp" line="1" >string[] names = {"Cheryl", "Joe", "Matt", "Robert"}; foreach (string person in names) {

   Console.Write (" " + person);

}</csharp>

produces

 Cheryl Joe Matt Robert

Homework

Write a program that averages 10 numbers