Minepit Lake

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace ConsoleApp1
{
    class Program
    {

        static int rows, columns;
        static int[,] array = new int[99, 99];

        static int n = 2;
        static void exn()
        {
            Console.WriteLine($"Exercise {n++}.");
        }

        static void ex1()
        {
            // 1.Import and store the contents of file depth.txt
            // and solve the following exercises using those data.
            StreamReader sr = new StreamReader("depth.txt");
            rows = Convert.ToInt16(sr.ReadLine());    // 1st line
            columns = Convert.ToInt16(sr.ReadLine()); // 2nd line
            array = new int[rows, columns];
            for (int r = 0; r < rows; r++){           // rows
                var line = sr.ReadLine().Split();     // read a line (more values)
                for (int c = 0; c < columns; c++){    // columns
                    array[r, c] = Convert.ToInt16(line[c]);
                }
            }
            sr.Close();
        }

        static void ex2()
        {
            // 2.Request the identifier of a row and a column, then
            // display the measurement data at that point on
            // the screen.
            // (Row and column numbering should start with 1.)
            exn();
            int R, C;
            Console.Write("Row identifier of the measurement point = ");
            R = Convert.ToInt16(Console.ReadLine());
            Console.Write("Column identifier of the measurement point = ");
            C = Convert.ToInt16(Console.ReadLine());
            Console.WriteLine($"The measured depth at the given point is {array[R - 1, C - 1]} dm.");
        }

        static void ex3()
        {
            // 3.Determine the surface area of the lake(that is, the grey area)
            // and the average depth of the lake.
            // Display the two results on the screen according to the example.
            // The average depth of the lake should be displayed in metres with an
            // accuracy of two decimal digits.
            exn();
            int count = 0;
            double sum = 0;
            for (int r = 0; r < rows; r++){ // rows
                for (int c = 0; c < columns; c++){ // columns
                    if (array[r, c] > 0){   // water
                        count++;            // count of water surface
                        sum += array[r, c]; // sum of depths
                    }
                }
            }
            Console.WriteLine($"The surface area of the lake is {count} m2, it's average depth is {sum / count / 10:F2} m.");
        }

        static void ex4() {
            /*4. What is the greatest depth of the lake and where is the deepest point? Display the answer
            on the screen.Display the coordinates of the deepest point according to the example, in
            (row; column) format.If there are several deepest points, then the coordinates of each point
            should be displayed. */
            exn();
            int max = 0;
            for (int r = 0; r < rows; r++){
                for (int c = 0; c < columns; c++){
                    if (max < array[r, c]){
                        max = array[r, c];
                    }
                }
            }
            Console.WriteLine($"The greatest depth of the lake is {max} dm");
            Console.Write("The row-column coordinates of the deepest point(s) are:\n");
            for (int r = 0; r < rows; r++){
                for (int c = 0; c < columns; c++){
                    if (max == array[r, c]){
                        Console.Write($"({r+1}; {c+1})\t");
                    }
                }
            }
        }

        static void ex5() {
            /*5. Find the length of the shore of the lake, that is, the length of the black line bordering the
            grey area. Also include the perimeter of the islands in the lake into the length of the shore.
            Display the result on the screen according to the example. (In the solution you can make
            use of the fact that the data in the first and last rows and columns of the table are all 0.)*/
            Console.WriteLine();
            exn();
            int shore = 0;
            for (int r = 0; r < rows-1; r++){
                for (int c = 0; c < columns-1; c++){
                    if (array[r, c] == 0 && array[r, c+1] != 0 || array[r, c] != 0 && array[r, c + 1] == 0){
                        shore++;
                    }
                    if (array[r, c] == 0 && array[r+1, c] != 0 || array[r, c] != 0 && array[r + 1, c] == 0){
                        shore++;
                    }
                }
            }
            Console.WriteLine($"The length of the shore is {shore} m");
        }

        static void ex6(){
            /*6. Request the identifier of a column from the user and show the depth of the lake in the given
            column in text file chart.txt using a “bar chart” in the following way. The beginning of
            the line should contain the row identifier of the measurement point with exactly two digits,
            then add as many asterisks (*) next to each other as the depth of the lake at the given point
            in metres. Round the measurement data according to the rules of mathematics.
             */
            exn();
            int C;
            Console.Write("Column identifier of the measurement point = ");
            C = Convert.ToInt16(Console.ReadLine());
            StreamWriter sw = new StreamWriter("chart.txt");
            for (int r = 0; r < rows; r++){
                sw.Write($"{r+1:D2} ");
                for (int i = 0; i < array[r, C - 1]; i++)
                {
                    sw.Write("*");
                }
                sw.WriteLine();
            }
            sw.Close();
        }

        static void Main(string[] args)
        {
            ex1();
            //ex2();
            ex3();
            ex4();
            ex5();
            ex6();

            Console.ReadKey();
        }
    }
}