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==Assigning array reference variables==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
int i;

int[] nums1 = new int[10];
int[] nums2 = new int[10];

for(i=0; i < 10; i++)
nums1[i] = i;

for(i=0; i < 10; i++)
nums2[i] = -i;

Console.Write("Here is nums1: ");
for(i=0; i < 10; i++)
Console.Write(nums1[i] + " ");
Console.Write("Here is nums2: ");
for(i=0; i < 10; i++)
Console.Write(nums2[i] + " ");
Console.WriteLine();

nums2 = nums1; // now nums2 refers to nums1

Console.Write("Here is nums2 after assignment: ");
for(i=0; i < 10; i++)
Console.Write(nums2[i] + " ");
Console.WriteLine();
}
}</source>
<pre class=codeResult>Here is nums1: 0 1 2 3 4 5 6 7 8 9 Here is nums2: 0 -1 -2 -3 -4 -5 -6 -7 -8 -9
Here is nums2 after assignment: 0 1 2 3 4 5 6 7 8 9</pre>

==Demonstrate an array overrun==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
int[] sample = new int[10];
int i;

// generate an array overrun
for(i = 0; i < 100; i = i+1)
sample[i] = i;
}
}</source>
<pre class=codeResult>Unhandled Exception: System.IndexOutOfRangeException: Index was outside the bounds of the array.
at MainClass.Main()</pre>

==Set array element value by index(subscript)==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
int[] nums = new int[10];
int avg = 0;

nums[0] = 99;
nums[1] = 10;
nums[2] = 100;
nums[3] = 18;
nums[4] = 78;
nums[5] = 23;
nums[6] = 63;
nums[7] = 9;
nums[8] = 87;
nums[9] = 49;

for(int i=0; i < 10; i++)
avg = avg + nums[i];

avg = avg / 10;

Console.WriteLine("Average: " + avg);
}
}</source>
<pre class=codeResult>Average: 53</pre>

==Swapping Data between Positions in an Array==

<source lang="csharp">class MainClass
{
static void Main()
{
string[] languages = new string[9]{"C#", "COBOL", "Java","C++"};
string language = languages[3];
languages[3] = languages[2];
languages[2] = language;
}
}</source>

==Use the IndexOf() and LastIndexOf() methods to find the string "Hello" in stringArray==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
string[] stringArray = {"Hello", "to", "everyone", "Hello", "all"};
Console.WriteLine("stringArray:");
for (int i = 0; i < stringArray.Length; i++)
{
Console.WriteLine("stringArray[" + i + "] = " + stringArray[i]);
}

int index = Array.IndexOf(stringArray, "Hello");
Console.WriteLine("Array.IndexOf(stringArray, \"Hello\") = " + index);
index = Array.LastIndexOf(stringArray, "Hello");
Console.WriteLine("Array.LastIndexOf(stringArray, \"Hello\") = " + index);
}
}</source>
<pre class=codeResult>stringArray:
stringArray[0] = Hello
stringArray[1] = to
stringArray[2] = everyone
stringArray[3] = Hello
stringArray[4] = all
Array.IndexOf(stringArray, "Hello") = 0
Array.LastIndexOf(stringArray, "Hello") = 3</pre>

==Use the IndexOf() and LastIndexOf() methods to find the value 1 in intArray==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
int[] intArray = {1, 2, 1, 3};
Console.WriteLine("intArray:");
for (int i = 0; i < intArray.Length; i++)
{
Console.WriteLine("intArray[" + i + "] = " +
intArray[i]);
}

int index = Array.IndexOf(intArray, 1);
Console.WriteLine("Array.IndexOf(intArray, 1) = " + index);
index = Array.LastIndexOf(intArray, 1);
Console.WriteLine("Array.LastIndexOf(intArray, 1) = " + index);
}
}</source>
<pre class=codeResult>intArray:
intArray[0] = 1
intArray[1] = 2
intArray[2] = 1
intArray[3] = 3
Array.IndexOf(intArray, 1) = 0
Array.LastIndexOf(intArray, 1) = 2</pre>

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