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2010-05-26T15:31:53Z

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==A two-dimensional array==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
int t, i;
int[,] table = new int[3, 4];

for(t=0; t < 3; ++t) {
for(i=0; i < 4; ++i) {
table[t,i] = (t*4)+i+1;
Console.Write(table[t,i] + " ");
}
Console.WriteLine();
}
}
}</source>
<pre class=codeResult>1 2 3 4
5 6 7 8
9 10 11 12</pre>

==Declare, create, and initialize the rectangular array==

<p>The general form of a multidimensional array declaration:</p>

<source lang="csharp">type[, ...,] name = new type[size1, size2, ..., sizeN];</source>

==Declaring a Jagged Array==

<source lang="csharp">class MainClass
{
static void Main()
{
int[][] cells = {
new int[]{1, 0, 2},
new int[]{0, 2, 0},
new int[]{1, 2, 1}
};
cells[1][0] = 1;
}
}</source>

==Declaring a Two-Dimensional Array==

<source lang="csharp">class MainClass
{
static void Main()
{
int[,] cells = new int[3,3];
}
}</source>

==Initialize a two-dimensional array==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
int[,] sqrs = {
{ 1, 1 },
{ 2, 4 },
{ 3, 9 },
{ 4, 16 },
{ 5, 25 },
{ 6, 36 },
{ 7, 49 },
{ 8, 64 },
{ 9, 81 },
{ 10, 100 }
};
int i, j;

for(i=0; i < 10; i++) {
for(j=0; j < 2; j++)
Console.Write(sqrs[i,j] + " ");
Console.WriteLine();
}
}
}</source>
<pre class=codeResult>1 1
2 4
3 9
4 16
5 25
6 36
7 49
8 64
9 81
10 100</pre>

==Initialize multidimensional arrays in declaration==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
int[,] matrix = { {1, 1}, {2, 2}, {3, 5}, {4, 5}, {134, 44} };

for (int i = 0; i < matrix.GetLength(0); i++)
{
for (int j = 0; j < matrix.GetLength(1); j++)
{
Console.WriteLine("matrix[{0}, {1}] = {2}", i, j, matrix[i, j]);
}
}
}
}</source>
<pre class=codeResult>matrix[0, 0] = 1
matrix[0, 1] = 1
matrix[1, 0] = 2
matrix[1, 1] = 2
matrix[2, 0] = 3
matrix[2, 1] = 5
matrix[3, 0] = 4
matrix[3, 1] = 5
matrix[4, 0] = 134
matrix[4, 1] = 44</pre>

==Initializing a Jagged Array==

<source lang="csharp">class MainClass
{
static void Main()
{
int[][] cells = {
new int[]{1, 0, 2, 0},
new int[]{1, 2, 0},
new int[]{1, 2},
new int[]{1}
};
}
}</source>

==Initializing a Two-Dimensional Array of Integers==

<source lang="csharp">class MainClass
{
static void Main()
{
int[,] cells = {
{1, 0, 2},
{0, 2, 0},
{1, 2, 1}
};
// Set the winning tic-tac-toe move to be player 1.
cells[1,0] = 1;
}
}</source>

==Retrieving a Particular Dimension"s Size==

<source lang="csharp">class MainClass
{
static void Main()
{
bool[,,] cells;
cells = new bool[2,3,3];
System.Console.WriteLine(cells.GetLength(0)); // Displays 2
}
}</source>

==Sum the values on a diagonal of a atrix==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
int[,,] m = new int[3, 3, 3];
int sum = 0;
int n = 1;

for(int x=0; x < 3; x++)
for(int y=0; y < 3; y++)
for(int z=0; z < 3; z++)
m[x, y, z] = n++;

sum = m[0,0,0] + m[1,1,1] + m[2, 2, 2];

Console.WriteLine("Sum of first diagonal: " + sum);
}
}</source>
<pre class=codeResult>Sum of first diagonal: 42</pre>

==The use of a three-dimensional rectangular array==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
int[,,] intArray = new int [10, 5, 3];
intArray[1, 3, 2] = 3;
intArray[4, 1, 2] = 9;
Console.WriteLine("intArray.Rank (number of dimensions) = " + intArray.Rank);
Console.WriteLine("intArray.Length (number of elements) = " + intArray.Length);
for (int x = 0; x < intArray.GetLength(0); x++)
{
for (int y = 0; y < intArray.GetLength(1); y++)
{
for (int z = 0; z < intArray.GetLength(2); z++)
{
if (intArray[x, y, z] != 0)
{
Console.WriteLine("intArray[" + x + ", " + y + ", " + z +"] = " + intArray[x, y, z]);
}
}
}
}
}
}</source>
<pre class=codeResult>intArray.Rank (number of dimensions) = 3
intArray.Length (number of elements) = 150
intArray[1, 3, 2] = 3
intArray[4, 1, 2] = 9</pre>

==Use a single for loop to assign a two-dimensional array==

<source lang="csharp">using System;
class MainClass
{
static void Main(string[] args)
{
//multidimensional array
int[,] MyIntArray = new int[5, 5];
for (int x = 0, y = 0; x < 5; x++, y++)
{
MyIntArray[x, y] = 0;
}
}
}</source>

==Use foreach on a two-dimensional array.==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
int sum = 0;
int[,] nums = new int[3,5];

for(int i = 0; i < 3; i++)
for(int j=0; j < 5; j++)
nums[i,j] = (i+1)*(j+1);

foreach(int x in nums) {
Console.WriteLine("Value is: " + x);
sum += x;
}
Console.WriteLine("Summation: " + sum);
}
}</source>
<pre class=codeResult>Value is: 1
Value is: 2
Value is: 3
Value is: 4
Value is: 5
Value is: 2
Value is: 4
Value is: 6
Value is: 8
Value is: 10
Value is: 3
Value is: 6
Value is: 9
Value is: 12
Value is: 15
Summation: 90</pre>

==Use Foreach statement to loop through Rectangular Array==

<source lang="csharp">using System;
class MainClass
{
static void Main()
{
int[,] arr1 = { { 0, 1 }, { 2, 3 } };
foreach (int element in arr1)
{
Console.WriteLine ("Element: {0}", element);
}
}
}</source>
<pre class=codeResult>Element: 0
Element: 1
Element: 2
Element: 3</pre>

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в 15:31, 26 мая 2010

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