Arrays - 2D Arrays
Introduction
CONCEPT: 2D arrays store data in rows and columns much like a spreadsheet. Accessing the data can be done in several ways:
- Access all the data in a given row
- Access all the data in a given column
- Access a sigle data item by specifying its row and column
Sample Code
namespace TwoDArrayDemo
{
class Program
{
static void Main(string[] args)
{
Setup();
//variables
string[,] data = { { "row0 - col0", "row0 - col1", "row0 - col2" },
{ "row1 - col0", "row1 - col1", "row1 - col2" },
{ "row2 - col0", "row2 - col1", "row2 - col2" },
{ "row3 - col0", "row3 - col1", "row3 - col2" }};
const int Rows = 5;
const int Columns = 10;
int[,] numbers = new int[Rows, Columns];
int columnSum,
rowSum,
columnTotal= 0,
rowTotal = 0;
//Load the 2D int array
LoadArrayRandom(numbers, Rows, Columns);
//Dispaly the string 2D array
DisplayArray(data, data.GetLength(0), data.GetLength(1));
//Display the int 2D array
DisplayArray(numbers, Rows, Columns);
Console.WriteLine();
//Add up the Column numbers
for (int column = 0; column < Columns; column++)
{
columnSum = SumColumns(numbers, Rows, column);
Console.WriteLine("The sum of numbers in column {0} is {1}", column, columnSum);
columnTotal += columnSum;
}//end for
Console.WriteLine();
//Add up the Row numbers
for(int row = 0; row < Rows; row++)
{
rowSum = SumRows(numbers, row, Columns);
Console.WriteLine(" The sum of numbers in row {0} is {1}", row, rowSum);
rowTotal += rowSum;
}//end for
Console.WriteLine();
Console.WriteLine("Column Total is {0}", columnTotal);
Console.WriteLine(" Row Total is {0}", rowTotal);
Console.ReadLine();
}//eom
static void DisplayArray(string[,] data, int rows, int columns)
{
Console.WriteLine("\nString Data:");
for (int row = 0; row < rows; row++)
{
for(int col = 0; col < columns; col++)
{
Console.Write("{0}\t", data[row, col]);
}
Console.WriteLine();
}
}//end of DisplayArray
static void DisplayArray(int[,] numbers, int rows, int columns)
{
Console.WriteLine("\nInteger Data:");
for (int row = 0; row < rows; row++)
{
for (int col = 0; col < columns; col++)
{
Console.Write("{0,2}\t", numbers[row, col]);
}
Console.WriteLine();
}
}//end of DisplayArray
static void LoadArrayRandom(int[,] numbers, int rows, int cols)
{
Random rnd = new Random();
for (int row = 0; row < rows; row++)
{
for (int col = 0; col < cols; col++)
{
numbers[row, col] = rnd.Next(1, 101);
}//end inner for
}//end outer for
}//end LoadArrayRandom
static int SumColumns(int[,] numbers, int rows, int column)
{
int sum = 0;
for (int row = 0; row < rows; row++)
{
sum += numbers[row, column];
}
return sum;
}//end SumColumns
static int SumRows(int[,] numbers, int row, int columns)
{
int sum = 0;
for (int col = 0; col < columns; col++)
{
sum += numbers[row, col];
}
return sum;
}//end of SumRows
#region Provided Methods - DO NOT MODIFY
static void Setup()
{
Console.Title = "2D Array Demo";
Console.ForegroundColor = ConsoleColor.Black;
Console.BackgroundColor = ConsoleColor.White;
Console.Clear();
}//end of Setup
#endregion
}//eoc
}//eon
