Matrix Multiplication by Dynamic values (matrix value at run time)
// Program in C# to multiply two matrices using Rectangular arrays.
using System;
class MatrixMultiplication
{
int[,] a;
int[,] b;
int[,] c;
public void ReadMatrix()
{
Console.WriteLine("\n Size of Matrix 1:");
Console.Write("\n Enter the number of rows in Matrix 1 :");
int m = int.Parse(Console.ReadLine());
Console.Write("\n Enter the number of columns in Matrix 1 :");
int n = int.Parse(Console.ReadLine());
a = new int[m, n];
Console.WriteLine("\n Enter the elements of Matrix 1:");
for (int i = 0; i < a.GetLength(0); i++)
{
for (int j = 0; j < a.GetLength(1); j++)
{
a[i, j] = int.Parse(Console.ReadLine());
}
}
Console.WriteLine("\n Size of Matrix 2 :");
Console.Write("\n Enter the number of rows in Matrix 2 :");
m = int.Parse(Console.ReadLine());
Console.Write("\n Enter the number of columns in Matrix 2 :");
n = int.Parse(Console.ReadLine());
b = new int[m, n];
Console.WriteLine("\n Enter the elements of Matrix 2:");
for (int i = 0; i < b.GetLength(0); i++)
{
for (int j = 0; j < b.GetLength(1); j++)
{
b[i, j] = int.Parse(Console.ReadLine());
}
}
}
public void PrintMatrix()
{
Console.WriteLine("\n Matrix 1:");
for (int i = 0; i < a.GetLength(0); i++)
{
for (int j = 0; j < a.GetLength(1); j++)
{
Console.Write("\t" + a[i, j]);
}
Console.WriteLine();
}
Console.WriteLine("\n Matrix 2:");
for (int i = 0; i < b.GetLength(0); i++)
{
for (int j = 0; j < b.GetLength(1); j++)
{
Console.Write("\t" + b[i, j]);
}
Console.WriteLine();
}
Console.WriteLine("\n Resultant Matrix after multiplying Matrix 1 & Matrix 2:");
for (int i = 0; i < c.GetLength(0); i++)
{
for (int j = 0; j < c.GetLength(1); j++)
{
Console.Write("\t" + c[i, j]);
}
Console.WriteLine();
}
Console.ReadLine();
}
public void MultiplyMatrix()
{
if (a.GetLength(1) == b.GetLength(0))
{
c = new int[a.GetLength(0), b.GetLength(1)];
for (int i = 0; i < c.GetLength(0); i++)
{
for (int j = 0; j < c.GetLength(1); j++)
{
c[i, j] = 0;
for (int k = 0; k < a.GetLength(1); k++) // OR k c[i, j] = c[i, j] + a[i, k] * b[k, j];
}
}
}
else
{
Console.WriteLine("\n Number of columns in Matrix1 is not equal to Number of rows in Matrix2.");
Console.WriteLine("\n Therefore Multiplication of Matrix1 with Matrix2 is not possible");
Console.ReadLine();
Environment.Exit(-1);
}
}
}
class Matrices
{
public static void Main()
{
MatrixMultiplication MM = new MatrixMultiplication();
MM.ReadMatrix();
MM.MultiplyMatrix();
MM.PrintMatrix();
}
}
OUTPUT
---------
SUCCESS:
ERROR MSG
