C# – Arrays

Compiled in Visual Studio 2017.

using System;
using System.Linq;

class Program
{
static ref int FirstElement(int[] array)
{
return ref array[0];
}

static void Main()
{
int[] array1 = { 1, 4, 2, 7, 6, 4, 4, 5, 3, 7 };
int[] array2 = new int[10];
int maxValue = array1.Max();
int indexElement = Array.IndexOf(array1, maxValue);

// display elements in array1
Console.Write("Original Array1: ");
for (int i = 0; i < array1.Length; i++)
{
Console.Write(array1[i]);
Console.Write(' ');
}

// max value
Console.Write("\n\nMax value in array: {0}", maxValue);
// index of max value
Console.Write("\n\nIndex of max value in array: {0}", indexElement);
Console.Write("\n\n");

// sort ascending
Console.Write("Array1 sorted ascending: ");
Array.Sort(array1);
for (int i = 0; i < array1.Length; i++)
{
Console.Write(array1[i]);
Console.Write(' ');
}
Console.Write("\n\n");

// sort descending
Console.Write("Array1 sorted descending: ");
Array.Reverse(array1);
for (int i = 0; i < array1.Length; i++)
{
Console.Write(array1[i]);
Console.Write(' ');
}
Console.Write("\n\n");

// make a change to array1, index 0
FirstElement(array1) = 9;

// display elements with a change in array1
Console.Write("Array1 with changed element: ");
for (int i = 0; i < array1.Length; i++)
{
Console.Write(array1[i]);
Console.Write(' ');
}
Console.Write("\n\n");

// copy all elements from array1 to array2
int[] array1OriginalData1 = { 1, 4, 2, 7, 6, 4, 4, 5, 3, 7 };
Array.Copy(array1OriginalData1, 0, array2, 0, 10);

int[] array1OriginalData2 = { 1, 4, 2, 7, 6, 4, 4, 5, 3, 7 };

// display elements in array2
Console.Write("Array2 copied from Array1: ");
for (int i = 0; i < array2.Length; i++)
{
Console.Write(array2[i]);
Console.Write(' ');
}
Console.Write("\n\n");

// Array.Copy
// p1 = source array
// p2 = start index in source array
// p3 = destination array
// p4 = start index in destination array
// p5 = elements to copy

// array1 with index
Console.Write("Array1 sorted with Index:\n");
for (int i = 0; i < array1OriginalData1.Length; i++)
{
int indexVal = Array.IndexOf(array1OriginalData1, array1OriginalData1[i]);
Console.Write(array1OriginalData1[i] + "(" + indexVal.ToString() + ")");
Console.Write(' ');
}
Console.Write("\n\n");

// sort array1 into array2 by max value

Console.Write("Array2 sorted by max value from Array1: ");
// sort descending
Array.Reverse(array1OriginalData1);

// move by index value to array2
for (int i = 0; i < array1.Length; i++)
{
Array.Copy(array1OriginalData1, i, array2, i, 1);
Console.Write(array2[i]);
Console.Write(' ');
}
Console.Write("\n\n");

Console.Write("\n\nCleared array 1\n");
Array.Clear(array1, 0, array1.Length);
for (int i = 0; i < array1.Length; i++)
{
Console.Write(array1[i]);
Console.Write(' ');
}
Console.Write("\n");

Console.Write("\n\nCleared array 2\n");
Array.Clear(array2, 0, array2.Length);
for (int i = 0; i < array2.Length; i++)
{
Console.Write(array2[i]);
Console.Write(' ');
}
Console.Write("\n");

Console.ReadKey();
}
}