C# Arrays

Pascal caseAddUp(..)Camel casefirstNumberC Programming Language casefirst_numbera word on naming conventions

Why use Arrays?How to set up Array?Arrays and LoopsSet size of Arrays at runtimeForeach loopWhat will we learn?

The variables we have been working with so far have only been able to hold one value at a timeExample:int lotteryNumber1 = 1;int lotteryNumber2 = 2;int lotteryNumber3 = 3; :An Array allows you to use just one identifying name that refers to lots of valuesWhy use Arrays?

1. Declaration:int[] lotteryNumbers;float[] myFloatValues;string[] myStrings;2. Size of array:lotteryNumbers = new int[4];myFloatValues = new float[10];myStrings = new string[5];How to setup an Array

Declaration and setting the size in one lineint[] lotteryNumbers = new int[4];float[] myFloatValues = new float[10];string[] myStrings = new string[5];

arrayName[position] = arrayValue;int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; // first arraylotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; // last (4th) arrayAssigning values

int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; First index is ZERO

int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; Last index is (SIZE -1)

int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; Total number of array = SIZE

int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Declare, Set Array Size and Assign Values in one lineDeclare

int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Set Size of Array

int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Assign values

To loop through the following array:lotteryNumbers[0] lotteryNumbers[1]lotteryNumbers[2] lotteryNumbers[3] for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}Part 2 Arrays and Loops

for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}starts from 0The first index is ZERO

for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}Length is equal to the SIZE of arrayThe last index should be (Length – 1)

for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}i < lotteryNumers.Length

for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}i <= lotteryNumers.Length -1

New Solution and project: SpfChapter8Save allChange the project name to "Part 2 Arrays and Loops"Add a button and a listBoxAdd codes into the button click method:Hands On

change the size of Array to 49:

Looping through from 2nd Array to last Arrayint() lotteryNumbers = int(5);for (inti=2; i != lotteryNumbers.Length; ++i){lotteryNumbers(i) = 0;} Spots the Errors

Why use Arrays?How to set up Array?Arrays and LoopsReview

Set size of Arrays at runtimeForeach loopWhat will we learn?

The size of an array refers to how many items it holdsBut sometimes, you just don’t know how big the array needs to be – for example, when the application depends on user’s input during runtimePart 3 Set the Size of a C# array at RunTime

Add another button and textboxContinue from previous project

Add codes for button2 Click method:

The size of the array is set only during runtime

Compare for loop and foreach loop:for (int i = 0; i != arraySize.Length; i++)foreach (int number in arraySize)foreach loop

Compare for loop and foreach loop:for (int i = 0; i != arraySize.Length; i++)foreach (int number in arraySize)foreach looploop through from 0 to (Length-1) counter

Compare for loop and foreach loop:for (int i = 0; i != arraySize.Length; i++)foreach (int number in arraySize)foreach looploop through from 0 to (Length-1) counterindividual element in array

Compare for loop and foreach loop:for (int i = 0; i != arraySize.Length; i++)foreach (int number in arraySize)foreach loopIndividual element: arraySize[i]Individual element: number

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string Array is similar to integer Array string[] arrayStrings;arrayStrings = new string[5];foreach loop for stringforeach (string arrayElement in arrayStrings)Using foreach with string Array

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C# Arrays

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C# Arrays