Belov_HW_CS3

using System;
using System.Linq;
using System.Text;

namespace Example
{
    class MyApplication
    {
        static void CeasarEncode(string input, int shift)
        {
            StringBuilder encoded = new StringBuilder(input);
            for (int i = 0; i < encoded.Length; i++)
                encoded[i] += Convert.ToChar(shift);
            Console.WriteLine(encoded);
            Console.ReadKey();
            Console.Clear();
        }
        static void CeasarDecode(string input, int shift)
        {
            StringBuilder encoded = new StringBuilder(input);
            for (int i = 0; i < encoded.Length; i++)
                encoded[i] -= Convert.ToChar(shift);
            Console.WriteLine(encoded);
            Console.ReadKey();
            Console.Clear();
        }
        static void MatrixMult(double[,] matrix, double value)
        {
            for (int i = 0; i < matrix.GetLength(0); i++)
            {
                for (int j = 0; j < matrix.GetLength(1); j++)
                {
                    matrix[i, j] *= value;
                    Console.Write("{0:F2} ", matrix[i, j]);
                }
                Console.WriteLine();
            }
            Console.ReadKey();
            Console.Clear();
        }
        static void MatrixMult(double[,] first, double[,] second)
        {
            if (first.GetLength(0) == second.GetLength(1) && first.GetLength(1) == second.GetLength(0))
            {
                int maxCoulmn = Math.Max(first.GetLength(0), second.GetLength(0));
                int maxRows = Math.Max(first.GetLength(1), second.GetLength(1));
                double[,] result = new double[maxCoulmn, maxRows];
                for (int i = 0; i < maxCoulmn; i++)
                {
                    for (int m = 0; m < first.GetLength(1); m++)
                    {
                        double sum = 0;
                        for (int k = 0; k < first.GetLength(1); k++)
                        {
                            sum += first[i, k] * second[k, m];
                        }
                        result[i, m] = sum;
                        Console.Write($"{result[i, m]} ");
                    }
                    Console.WriteLine();
                }
            }
            else
            {
                Console.WriteLine("Неверный формат.");
            }
            Console.ReadKey();
            Console.Clear();
        }
        static void SumMatrix(double[,] first, double[,] second)
        {
            if (first.GetLength(0) == second.GetLength(0) && first.GetLength(1) == second.GetLength(1))
            {
                double[,] result = new double[first.GetLength(0), first.GetLength(1)];
                for (int i = 0; i < result.GetLength(0); i++)
                {
                    for (int j = 0; j < result.GetLength(1); j++)
                    {
                        result[i, j] = first[i, j] + second[i, j];
                        Console.Write("{0} ", result[i, j]);
                    }
                    Console.WriteLine();
                }
            }
            else
            {
                Console.WriteLine("Неверный формат.");
            }
        }
        static void CalcString(string input)
        {
            char[] operations = { '+', '-' };
            int operandShift = 1;
            string[] operands = input.Split(new char[] { '+', '-' });
            double result = double.Parse(operands[0]);
            while (true)
            {
                int index = input.IndexOfAny(operations);
                if (index == -1)
                    break;
                if (input[index] == '+')
                    result += double.Parse(operands[operandShift]);
                else if (input[index] == '-')
                    result -= double.Parse(operands[operandShift]);
                operandShift++;
                input = input.Remove(0, index + 1);
            }
            Console.WriteLine($"{result}");
            Console.ReadKey();
            Console.Clear();
        }
        static void UpperSentenceBeginning(string text)
        {
            string[] split = text.Split(new char[] { '.' }, StringSplitOptions.TrimEntries);
            Console.WriteLine(string.Join(". ", split.Select(s => s[0].ToString().ToUpper() + s.Substring(1))));
            Console.ReadKey();
            Console.Clear();
        }
        static void CensorString(string text, params string[] badWords)
        {
            foreach (var item in badWords)
            {
                int counter = 0;
                int startIndex = -1;
                while ((startIndex = (text.IndexOf(item, startIndex + 1))) != -1)
                    counter++;
                text = text.Replace(item, new string(Enumerable.Repeat('*', item.Length).ToArray()));
                Console.WriteLine($"{item} - {counter}");
            }
            Console.WriteLine(text);
            Console.ReadKey();
            Console.Clear();
        }
        public static void Main()
        {
            CeasarEncode("Я люблю свою маму", 3);
            CeasarDecode("в#оёдоё#фесё#пгпц", 3);
            MatrixMult(new double[,] { { 1, 2, 3, 4, 5 }, { 2, 3, 4, 5, 6 } }, 2.4);
            SumMatrix(new double[,] { { 1, 2, 3, 4, 5 }, { 2, 3, 4, 5, 6 } }, new double[,] { { 1, 2, 3, 4, 5 }, { 2, 3, 4, 5, 6 } });
            MatrixMult(new double[,] { { 0, -1, 1 }, { 3, 2, 2 }, { 1, 0, -2 } }, new double[,] { { 0, -1, 1 }, { 3, 2, 2 }, { 1, 0, -2 } });
            CalcString("1 + 2 + 4 + 3 - 220");
            UpperSentenceBeginning("today is a good day for walking. i will try to walk near the sea");
            CensorString(@"To be, or not to be, that is the question,
Whether 'tis nobler in the mind to suffer
The slings and arrows of outrageous fortune,
Or to take arms against a sea of troubles,
And by opposing end them? To die: to sleep;
No more; and by a sleep to say we end
The heart-ache and the thousand natural shocks
That flesh is heir to, 'tis a consummation
Devoutly to be wish'd. To die, to sleep", "die", "fortune");
        }
    }
}