I have the following code. when I run the code I have to one by one input fx,ft,apha,m,n. After I run the code:

Y
10
0.5
1
10
50

Code works with this way.
I writed to a file called "d:\\a.txt" this values(that is upper values).I tried to work the code by showing the file path but Code isn't works.

Orginal code:

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;

namespace hard
{
    class Program
    {
        static void Main(string[] args)
        {
            Program app = new Program();
        }

        Program()
        {
            bool ok = false
            double[] w = new double[25];
            double[] l = new double[25];
            double[] u = new double[25];
            double[] z = new double[25];
            double ft = 0.0, fx = 0.0, alpha = 0.0, h = 0.0, k = 0.0, vv = 0.0, t = 0.0, x = 0.0;
            int n = 0, m = 0, m1 = 0, m2 = 0, n1 = 0, flag = 0, i1 = 0, i = 0, j = 0 ;
            input(ref ok,ref fx,ref ft,ref alpha,ref n,ref m);
            
            if (ok)
            {
                m1 = m - 1;
                m2 = m - 2;
                //    n1 = n - 1;
                /* step 1 */
                h = fx / m;
                k = ft / n;
                vv = alpha * k / (h * h);
                /* step 2 */
                for (i = 1; i <= m1; i++) w[i - 1] = F(i * h);
                /* step 3 */
                l[0] = 1.0 - 2.0 * vv;
                u[0] = vv / l[0];
                /* step 4 */
                for (i = 2; i <= m2; i++)
                {
                    l[i - 1] = 1.0 - 2.0 * vv - vv * u[i - 2];
                    u[i - 1] = vv / l[i - 1];
                }
                /* step 5 */
                l[m1 - 1] = 1.0 - 2.0 * vv - vv * u[m2 - 1];
                /* step 6 */
                for (j = 1; j <= n; j++)
                {
                    /* step 7 */
                    /* current t(j) */
                    //   t = j * k;
                    z[0] = w[0] / l[0];
                    /* step 8 */
                
                    for (i = 2; i <= m1; i++)
                        z[i - 1] = (w[i - 1] - vv * z[i - 2]) / l[i - 1];
                    /* step 9 */
                    w[m1 - 1] = z[m1 - 1];
                    /* step 10 */
                    for (i1 = 1; i1 <= m2; i1++)
                    {
                        i = m2 - i1 + 1;
                        w[i - 1] = z[i - 1] - u[i - 1] * w[i];
                    }
                }
                /* step 11 */
                output(ft, x, m1,ref w, h);
            }
            
        }

        
        private double F(double X)
        {
            double f;
            f = 0.3061 * X * X -2.1286*X+38.11;
            return f;
        }

        private void input(ref bool ok,ref double fx, ref double ft, ref double alpha, ref int n, ref int m )
        {
            Console.Write("Has the function F been created immediately (Y/N) : ");
            string sonuc = Console.ReadLine();
            
            if (sonuc.ToUpper() == "Y")
            {
                Console.WriteLine("The lefthand endpoint on the X-axis is 0.");
                ok = false;
                while (!ok)
                {
                    Console.Write("Input the righthand endpoint on the X-axis: ");
                    fx = Convert.ToDouble(Console.ReadLine());
                    if (fx < 0.0)
                        Console.WriteLine("Must be positive number.");
                    else
                        ok = true;
                }
                ok = false;
                while (!ok)
                {
                    Console.Write("Input the maximum value of the time variable T : ");
                    ft = Convert.ToDouble(Console.ReadLine());
                    if (ft < 0.0)
                        Console.WriteLine("Must be positive number.");
                    else
                        ok = true;
                }
                Console.Write("Input the constant alpha: ");
                alpha = Convert.ToDouble(Console.ReadLine());
                Console.WriteLine("Input integer m = number of intervals”);                                              
                Console.WriteLine("input N = number of time intervals");
                Console.WriteLine("Note :must be m>3 ve n>0 ");
                ok = false;
                while (!ok)
                {
                    Console.Write("m (>3) = ");
                    m = Convert.ToInt32(Console.ReadLine());
                    Console.Write("n (>0) = ");
                    n = Convert.ToInt32(Console.ReadLine());
                    if (m <= 2 || n <= 0)
                    {
                        Console.WriteLine("Numbers are not within correct range.");
                    }
                    else
                    {
                        ok = true;
                    }
                }
            }
            else
            {
                Console.WriteLine("The program will end so that the function F can be created.");
                ok = false;
            }
        }

        public void output(double ft, double x, int m1, ref double[] w, double h)
        {
            System.IO.StreamWriter oup;
            System.IO.TextWriter tmp = Console.Out;
            Console.WriteLine("Choice of output method.");
            Console.WriteLine("1. Output to screen");
            Console.WriteLine("2. Output to text file");
            int flag = Convert.ToInt32(Console.ReadLine());
            if (flag == 2)
            {
                
                Console.WriteLine("Sample:   D:\\1.txt");
                string name = Console.ReadLine();
                try
                {
                    
                    oup = new System.IO.StreamWriter(name);
                    Console.SetOut(oup);
                    write(ft, x, m1, ref w, h);
                    oup.Close();
                }
                catch (System.IO.IOException expc)
                {
                    Console.WriteLine(expc.Message + " file dont extract.");
                }
            }
            else
            {
                write(ft, x, m1, ref w, h);
            }


        }

        private void write(double ft, double x, int m1, ref double[] w, double h)
        {
            
            Console.WriteLine("I\tX(I)\tW(X(I),{0:#.#})", ft);
               for (int i = 1; i <= m1; i++)
            {
                x = i * h;
                Console.WriteLine("{0:#.##}\t{1:#.###}\t\t{2:#.###}", i, x, w[i - 1]);
            }
        }
    }
}

don't working code:

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.IO;

namespace hard
{
    class Program
    {
        static void Main(string[] args)
        {
            Program app = new Program();
        }

        Program()
        {
            bool ok = false;
            double[] w = new double[25];
            double[] l = new double[25];
            double[] u = new double[25];
            double[] z = new double[25];
            double ft = 0.0, fx = 0.0, alpha = 0.0, h = 0.0, k = 0.0, vv = 0.0, t = 0.0, x = 0.0;
            int n = 0, m = 0, m1 = 0, m2 = 0, n1 = 0, flag = 0, i1 = 0, i = 0, j = 0 ;
            input(ref ok,ref fx,ref ft,ref alpha,ref n,ref m);
            
            if (ok)
            {
                m1 = m - 1;
                m2 = m - 2;
                //    n1 = n - 1;
                /* step 1 */
                h = fx / m;
                k = ft / n;
                vv = alpha * k / (h * h);
                /* step 2 */
                for (i = 1; i <= m1; i++) w[i - 1] = F(i * h);
                /* step 3 */
                l[0] = 1.0 - 2.0 * vv;
                u[0] = vv / l[0];
                /* step 4 */
                for (i = 2; i <= m2; i++)
                {
                    l[i - 1] = 1.0 - 2.0 * vv - vv * u[i - 2];
                    u[i - 1] = vv / l[i - 1];
                }
                /* step 5 */
                l[m1 - 1] = 1.0 - 2.0 * vv - vv * u[m2 - 1];
                /* step 6 */
                for (j = 1; j <= n; j++)
                {
                    /* step 7 */
                    /* current t(j) */
                    //   t = j * k;
                    z[0] = w[0] / l[0];
                    /* step 8 */
                
                    for (i = 2; i <= m1; i++)
                        z[i - 1] = (w[i - 1] - vv * z[i - 2]) / l[i - 1];
                    /* step 9 */
                    w[m1 - 1] = z[m1 - 1];
                    /* step 10 */
                    for (i1 = 1; i1 <= m2; i1++)
                    {
                        i = m2 - i1 + 1;
                        w[i - 1] = z[i - 1] - u[i - 1] * w[i];
                    }
                }
                /* step 11 */
                output(ft, x, m1,ref w, h);
            }
            
        }

        
        private double F(double X)
        {
            double f;
            f = 0.3061 * X * X -2.1286*X+38.11;
            return f;
        }

        private void input(ref bool ok,ref double fx, ref double ft, ref double alpha, ref int n, ref int m )
        {
            try
            {
                FileStream fs = new FileStream("d:\\a.txt", FileMode.Open);
                StreamReader sr = new StreamReader(fs);

                List<string> lines = new List<string>();
                String line;
                //add all the lines to a list
                while ((line = sr.ReadLine()) != null)
                {
                    lines.Add(line);
                }
                //read the lines you would like to read:
                try
                {
                     fx = double.Parse(lines[0]);
                     ft = double.Parse(lines[1]);
                 alpha = double.Parse(lines[2]);
                     m = Int32.Parse(lines[3]);
                     n = Int32.Parse(lines[4]);
                }
                catch { }
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception in ShowFile: {0}", e);
            } 
            
        }

        public void output(double ft, double x, int m1, ref double[] w, double h)
        {
            System.IO.StreamWriter oup;
            System.IO.TextWriter tmp = Console.Out;
            Console.WriteLine("Choice of output method.");
            Console.WriteLine("1. Output to screen");
            Console.WriteLine("2. Output to text file");
            int flag = Convert.ToInt32(Console.ReadLine());
            if (flag == 2)
            {
                
                Console.WriteLine("Sample:   D:\\1.txt");
                string name = Console.ReadLine();
                try
                {
                    
                    oup = new System.IO.StreamWriter(name);
                    Console.SetOut(oup);
                    write(ft, x, m1, ref w, h);
                    oup.Close();
                }
                catch (System.IO.IOException expc)
                {
                    Console.WriteLine(expc.Message + " file dont extract.");
                }
            }
            else
            {
                write(ft, x, m1, ref w, h);
            }


        }

        private void write(double ft, double x, int m1, ref double[] w, double h)
        {
            
            Console.WriteLine("I\tX(I)\tW(X(I),{0:#.#})", ft);
               for (int i = 1; i <= m1; i++)
            {
                x = i * h;
                Console.WriteLine("{0:#.##}\t{1:#.###}\t\t{2:#.###}", i, x, w[i - 1]);
            }
        }
    }
}

I dont have any error message.
I want to run the code by showing file path d:\\a.txt insted of input each of values from screen.

problem solved:

finally code:

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Program app = new Program();
            Console.ReadLine();
        }

        Program()
        {
            bool ok = false;
            double[] w = new double[25];
            double[] l = new double[25];
            double[] u = new double[25];
            double[] z = new double[25];
            double ft = 0.0, fx = 0.0, alpha = 0.0, h = 0.0, k = 0.0, vv = 0.0, t = 0.0, x = 0.0;
            int n = 0, m = 0, m1 = 0, m2 = 0, n1 = 0, flag = 0, i1 = 0, i = 0, j = 0;
            input(ref ok, ref fx, ref ft, ref alpha, ref n, ref m);

            if (ok)
            {
                m1 = m - 1;
                m2 = m - 2;
                //    n1 = n - 1;
                /* step 1 */
                h = fx / m;
                k = ft / n;
                vv = alpha * k / (h * h);
                /* step 2 */
                for (i = 1; i <= m1; i++) w[i - 1] = F(i * h);
                /* step 3 */
                l[0] = 1.0 - 2.0 * vv;
                u[0] = vv / l[0];
                /* step 4 */
                for (i = 2; i <= m2; i++)
                {
                    l[i - 1] = 1.0 - 2.0 * vv - vv * u[i - 2];
                    u[i - 1] = vv / l[i - 1];
                }
                /* step 5 */
                l[m1 - 1] = 1.0 - 2.0 * vv - vv * u[m2 - 1];
                /* step 6 */
                for (j = 1; j <= n; j++)
                {
                    /* step 7 */
                    /* current t(j) */
                    //   t = j * k;
                    z[0] = w[0] / l[0];
                    /* step 8 */

                    for (i = 2; i <= m1; i++)
                        z[i - 1] = (w[i - 1] - vv * z[i - 2]) / l[i - 1];
                    /* step 9 */
                    w[m1 - 1] = z[m1 - 1];
                    /* step 10 */
                    for (i1 = 1; i1 <= m2; i1++)
                    {
                        i = m2 - i1 + 1;
                        w[i - 1] = z[i - 1] - u[i - 1] * w[i];
                    }
                }
                /* step 11 */
                output(ft, x, m1, ref w, h);
            }

        }


        private double F(double X)
        {
            double f;
            f = 0.3061 * X * X - 2.1286 * X + 38.11;
            return f;
        }

        private void input(ref bool ok, ref double fx, ref double ft, ref double alpha, ref int n, ref int m)
        {
            try
            {
                FileStream fs = new FileStream("D:\\1.txt", FileMode.Open);
                StreamReader sr = new StreamReader(fs);

                string[] lines = new string[10]; // you cannot use list like that
                string line;
                //add all the lines to a list
                int i = 0;
                while ((line = sr.ReadLine()) != null)
                {
                    lines[i++] = (line);
                }
                //read the lines you would like to read:
                
                    fx = double.Parse(lines[0]);
                    ft = double.Parse(lines[1]);
                    alpha = double.Parse(lines[2]);
                    m = Int32.Parse(lines[3]);
                    n = Int32.Parse(lines[4]);
              
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception in ShowFile: {0}", e);
            }
            ok = true;
        }

        public void output(double ft, double x, int m1, ref double[] w, double h)
        {
            System.IO.StreamWriter oup;
            System.IO.TextWriter tmp = Console.Out;
            Console.WriteLine("Choice of output method.");
            Console.WriteLine("1. Output to screen");
            Console.WriteLine("2. Output to text file");
            int flag = Convert.ToInt32(Console.ReadLine());
            if (flag == 2)
            {

                Console.WriteLine("Sample:   C:\\Data\\1.txt");
                string name = Console.ReadLine();
                try
                {
                    name = name.Replace(@"\", @"\\"); // look at the changes in the path
                    oup = new System.IO.StreamWriter(name);
                    Console.SetOut(oup);
                    write(ft, x, m1, ref w, h);
                    oup.Close();
                }
                catch (System.IO.IOException expc)
                {
                    Console.WriteLine(expc.Message + " file dont extract.");
                }
            }
            else
            {
                write(ft, x, m1, ref w, h);
            }


        }

        private void write(double ft, double x, int m1, ref double[] w, double h)
        {

            Console.WriteLine("I\tX(I)\tW(X(I),{0:#.#})", ft);
            for (int i = 1; i <= m1; i++)
            {
                x = i * h;
                Console.WriteLine("{0:#.##}\t{1:#.###}\t\t{2:#.###}", i, x, w[i - 1]);
            }
        }
    }
}

Thats a heck of a lot of code.

Work with something smaller, its easier for us, and easier for you as you end up with a small snippet with only whats needed in it

If you just read the files from console, its much harder because someone could write

"..\..\..\..\..\..\..\..\..\dir1\dir2\a.txt"

if you did that using the filepicker of course it would return you a full path to the file.

But, in the example above if your current directory was

c:\dir3\

then the new path would be c:\dir1\dir2\a.txt
but if the current directory was

c:\dir1\dir3

the new path would still be c:\dir1\dir2\a.txt

sounds like you should find a way of parsing the directories

This article has been dead for over six months. Start a new discussion instead.