C# Arrays
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The document discusses arrays in C# and .NET. It covers declaring and initializing arrays, setting array size at runtime, looping through arrays using for and foreach loops, and using arrays of different data types like integers, floats, and strings. Key points include declaring arrays, assigning values, getting the length of an array, looping from index 0 to length-1, and the differences between for and foreach loops when iterating over an array.
![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](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-5-320.jpg)
![Declaration and setting the size in one lineint[] lotteryNumbers = new int[4];float[] myFloatValues = new float[10];string[] myStrings = new string[5];](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-6-320.jpg)
![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](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-7-320.jpg)
![int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; First index is ZERO](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-8-320.jpg)
![int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; Last index is (SIZE -1)](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-9-320.jpg)
![int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; Total number of array = SIZE](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-10-320.jpg)
![int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Declare, Set Array Size and Assign Values in one lineDeclare](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-11-320.jpg)
![int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Set Size of Array](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-12-320.jpg)
![int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Assign values](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-13-320.jpg)
![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](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-14-320.jpg)
![for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}starts from 0The first index is ZERO](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-15-320.jpg)
![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)](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-16-320.jpg)
![for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}i < lotteryNumers.Length](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-17-320.jpg)
![for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}i <= lotteryNumers.Length -1](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-18-320.jpg)
![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](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-37-320.jpg)
![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](https://image.slidesharecdn.com/spfchapter8arrays-100519221515-phpapp01/85/C-Arrays-39-320.jpg)
C# Arrays
- 1. Chapter 8C# .NET Arrays
- 2. Pascal caseAddUp(..)Camel casefirstNumberC Programming Language casefirst_numbera word on naming conventions
- 3. Why use Arrays?How to set up Array?Arrays and LoopsSet size of Arrays at runtimeForeach loopWhat will we learn?
- 4. 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?
- 5. 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
- 6. Declaration and setting the size in one lineint[] lotteryNumbers = new int[4];float[] myFloatValues = new float[10];string[] myStrings = new string[5];
- 7. 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
- 8. int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; First index is ZERO
- 9. int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; Last index is (SIZE -1)
- 10. int[] lotteryNumbers = new int[4];lotteryNumbers[0] = 1; lotteryNumbers[1] = 2;lotteryNumbers[2] = 3;lotteryNumbers[3] = 4; Total number of array = SIZE
- 11. int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Declare, Set Array Size and Assign Values in one lineDeclare
- 12. int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Set Size of Array
- 13. int[] lotteryNumbers = new int[4] {1, 2, 3, 4};Assign values
- 14. 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
- 15. for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}starts from 0The first index is ZERO
- 16. 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)
- 17. for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}i < lotteryNumers.Length
- 18. for (inti = 0; i != lotteryNumbers.Length; i++){lotteryNumber[i] ….. // not complete}i <= lotteryNumers.Length -1
- 19. 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
- 20. Use Loop
- 22. Use Loop
- 25. 4
- 26. change the size of Array to 49:
- 27. Looping through from 2nd Array to last Arrayint() lotteryNumbers = int(5);for (inti=2; i != lotteryNumbers.Length; ++i){lotteryNumbers(i) = 0;} Spots the Errors
- 28. Why use Arrays?How to set up Array?Arrays and LoopsReview
- 29. Set size of Arrays at runtimeForeach loopWhat will we learn?
- 30. 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
- 31. Add another button and textboxContinue from previous project
- 32. Add codes for button2 Click method:
- 33. The size of the array is set only during runtime
- 34. Compare for loop and foreach loop:for (int i = 0; i != arraySize.Length; i++)foreach (int number in arraySize)foreach loop
- 35. 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
- 36. 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
- 37. 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
- 38. Continue from previous project (Extra)
- 39. 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
- 40. Continue from previous project
- 41. string array using for loop
- 43. string array using foreach