matrixCalculator

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _06ClassMatrix
{
    class Matrix
    {
        public const int rows = 3;
        public const int cols = 3;
        private double[,] matrix = new double[rows, cols];
        public double this[int rows, int cols]
        {
            get { return matrix[rows, cols]; }
            set { matrix[rows, cols] = value; }
        }
        public static Matrix operator +(Matrix matrix1, Matrix matrix2)
        {
            Matrix finalMatrix = new Matrix();

            for (int i = 0; i < rows ; i++)
            {
                for (int j = 0; j < cols; j++)
                {
                    finalMatrix[i, j] = matrix1[i, j] + matrix2[i, j];
                }
            }
            return finalMatrix;
        }
        public static Matrix operator *(Matrix matrix1, Matrix matrix2)
        {
            Matrix finalMatrix = new Matrix();
            for (int i = 0; i < rows; i++)
            {

                for (int j = 0; j < cols; j++)
                {
                    finalMatrix[i, j] = 0;
                    for (int p = 0; p < rows;p++ )//less than "rows" cause it's 3x3 matrix...and it doesn't metter rows or cols
                        finalMatrix[i, j] += matrix1[i, p] * matrix2[p, j];
                }
            }
            return finalMatrix;
        }
        public static Matrix operator -(Matrix matrix1, Matrix matrix2)
        {
            Matrix finalMatrix = new Matrix();
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < cols; j++)
                {
                    finalMatrix[i, j] = matrix1[i, j] - matrix2[i, j];
                }
            }
            return finalMatrix;
        }
    }

    class ClassMatrix
    {
        static void Main(string[] args)
        {
            Matrix firstMatrix = new Matrix();
            Matrix secondMatrix = new Matrix();

            Console.WriteLine("--1st--");
            InitMatrix(firstMatrix);
            Console.WriteLine("--2nd--");
            InitMatrix(secondMatrix);

            Matrix matrixFinal = new Matrix();
            Console.Write("Choose an operation between them:(+,-,*) ");
            string operation = Console.ReadLine();
            switch (operation)
            {
                case ("+"):
                    {
                        matrixFinal = firstMatrix + secondMatrix;
                        PrintMatrix(firstMatrix);
                        Console.WriteLine(".......+.......");
                        PrintMatrix(secondMatrix);
                        Console.WriteLine(".......=.......");
                        PrintMatrix(matrixFinal);
                    }
                    break;
                case ("-"):
                    {
                        matrixFinal = firstMatrix - secondMatrix;
                        PrintMatrix(firstMatrix);
                        Console.WriteLine(".......-.......");
                        PrintMatrix(secondMatrix);
                        Console.WriteLine(".......=.......");
                        PrintMatrix(matrixFinal);
                    }
                    break;
                case("*"):
                    {
                        matrixFinal = firstMatrix * secondMatrix;
                        PrintMatrix(firstMatrix);
                        Console.WriteLine(".......*.......");
                        PrintMatrix(secondMatrix);
                        Console.WriteLine(".......=.......");
                        PrintMatrix(matrixFinal);
                    }
                    break;
                default:
                    Console.WriteLine("Invalid choose...try again!");
                    break;
            }




        }
        public static void InitMatrix(Matrix matrix)
        {
            Console.WriteLine("Now enter the matrix' elements");
            for (int i = 0; i < Matrix.rows; i++)
            {
                for (int j = 0; j < Matrix.cols; j++)
                {
                    Console.Write("[{0},{1}] = ", i, j);
                    matrix[i, j] = double.Parse(Console.ReadLine());
                }
            }
        }
        public static void PrintMatrix(Matrix matrix)
        {
            for (int i = 0; i < Matrix.rows; i++)
            {
                for (int j = 0; j < Matrix.cols; j++)
                {
                    Console.Write("{0} ", matrix[i, j]);
                }
                Console.WriteLine();
            }
        }
    }
}