piece of code does not work

Question

Why does this piece of code does not work?
it is supposed to be a "random walk". and I should not be using any methods or classes. just branching, looping and arrays.
I have no errors from the compiler but when I try to run the code console appears and then disappears before I can do anything.

static void Main(string[] args)
        {
            Random randomObject = new Random();
            int randomDirection;
            int row=1;
            int col=1;
            while (true)
            {
                int n;
                int row = 1;
                int col = 1;
                Console.WriteLine("Enter the number of steps: ");
                n = Convert.ToInt32(Console.ReadLine());
                for (int i = 0; i < n; i++)
                {
                    randomDirection = randomObject.Next(1, 5);
                    if (randomDirection == 1 && row > 0 && row < 10)
                        row++;
                    else if (randomDirection == 2 && row > 0 && row < 10)
                        row--;
                    else if (randomDirection == 3 && col > 0 && col < 10)
                        col++;
                    else if (randomDirection == 4 && col > 0 && col < 10)
                        col--;
                    else
                        i--;
                }
                Console.WriteLine("You have walked in row: " + row);
                Console.WriteLine("You have walked in col: " + col);
                Console.WriteLine("");
            }
            Console.ReadKey();
        }

Srinubabu Ravilla · Answer

I have tried it. Please remove the local variable row and col and then try it as follows . using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { static void Main( string [] args) { Random randomObject = new Random (); int randomDirection; int row = 1; int col = 1; while ( true ) { int n; Console .WriteLine( Enter the number of steps:  ); n = Convert .ToInt32( Console .ReadLine()); for ( int i = 0; i { randomDirection = randomObject.Next(1 5); if (randomDirection == 1 && row > 0 && row row++; else if (randomDirection == 2 && row > 0 && row row--; else if (randomDirection == 3 && col > 0 && col col++; else if (randomDirection == 4 && col > 0 && col col--; else i--; } Console .WriteLine( You have walked in row:  + row); Console .WriteLine( You have walked in col:  + col); Console .WriteLine(  ); } Console .ReadKey(); } } }

Jignesh Trivedi · Answer

hi I have also got completion error on above code. A local variable named 'row' cannot be declared in this scope because it would give a different meaning to 'row' which is already used in a 'parent or current' scope to denote something else if we remove int declaration from row and col than it work fine. Random randomObject = new Random(); int randomDirection; int row = 1; int col = 1; while (true) { int n; row = 1; col = 1; Console.WriteLine(Enter the number of steps: ); n = Convert.ToInt32(Console.ReadLine()); for (int i22 = 0; i22 { randomDirection = randomObject.Next(1 5); if (randomDirection == 1 && row > 0 && row row++; else if (randomDirection == 2 && row > 0 && row row--; else if (randomDirection == 3 && col > 0 && col col++; else if (randomDirection == 4 && col > 0 && col col--; else i22--; } Console.WriteLine(You have walked in row:  + row); Console.WriteLine(You have walked in col:  + col); Console.WriteLine(); } Console.ReadKey();

saman hamidi · Answer

I did what you said. but it still doesn't work. the console shows and then disappears. could you please tell why this happens?

Javeed M Shaikh · Answer

I see a compiler error in your code: while (true) { int n; int row = 1; int col = 1; you have already declared int row and int col above this loop change it to: while (true) { int n; row = 1; col = 1;