I want to increase the length of the snake by eating each piece.

Question

1.00/5 (3 votes)

See more:

C#

<pre>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace SnakeGame
{
        class program
{
    enum Direction
    {
        Left,
        Right,
        Up,
        Down,
    }

    const char snakeBody = '■';
    const char snakeHook = '■';
    static int[] snakeX = new int[1000];
    static int[] snakeY = new int[1000];
    static int snakeLen;
    static Direction snakeDir = Direction.Right;
    const int SnakeStartX = 20;
    const int SnakeStartY = 0;
    private static int hookX;
    private static int hookY;

    static void Main(string[] args)
    {

        Console.CursorVisible = false;
        InitSnakePoints();
        CreateHook();
        while (true)
        {
            DrawSnake();
            Thread.Sleep(200);
            ChangeDirection();
            MoveSnake();
            if (IsFindHook())
            {
                IncreaseLen5();
                CreateHook();
            }
        }
    }
private static void IncreaseLen5(){
           for (int i=0;   i<5;  i++)
              IncreaseLen();
       }
          private static void IncreaseLen(){

    snakeX[snakeLen] = snakeX[snakeLen - 1];
    snakeY[snakeLen] = snakeY[snakeLen - 1];
}
private static bool IsFindHook()
{
    if (snakeX[0] == hookX)
        if (snakeY[0] == hookY)
            return true;
    return false;
}
     
private static void CreateHook()
{
    Random random = new Random();
    int x = random.Next(0, Console.WindowWidth  -1);
    int y = random.Next(0, Console.WindowHeight -1);


    hookX = x;
    hookY = y;

    Console.ForegroundColor = ConsoleColor.Red;
    Console.SetCursorPosition(x, y);
    Console.Write(snakeHook);

}
private static void ChangeDirection()
{
    if (Console.KeyAvailable == false) return;
    ConsoleKeyInfo keyInfo = Console.ReadKey();
    if (keyInfo.Key == ConsoleKey.LeftArrow && snakeDir != Direction.Right)
       {
        snakeDir = Direction.Left;
    }
    if (keyInfo.Key == ConsoleKey.RightArrow && snakeDir != Direction.Left )
    {
        snakeDir = Direction.Right;
    }
    if (keyInfo.Key == ConsoleKey.UpArrow && snakeDir != Direction.Down)
    {
        snakeDir = Direction.Up;
    }

    if (keyInfo.Key == ConsoleKey.DownArrow && snakeDir != Direction.Up)

    {
        snakeDir = Direction.Down;
    }
}
private static void MoveSnake()
{
    ClearTail();
    for (int i = snakeLen - 1; i > 0; i--)
    {
        snakeX[i] = snakeX[i -1 ];
        snakeY[i] = snakeY[i -1];
    }
    setHeadpoint();
}
private static void setHeadpoint()

{
    if (snakeDir == Direction.Left)
    {
        if (snakeX[0] > 0)
            snakeX[0]--; 
            else 
           snakeX[0] = Console.WindowWidth-1;
    }
    if (snakeDir == Direction.Right)
    {
        if (snakeX[0] < Console.WindowWidth - 1 )
       snakeX[0]++; 
    else 
        snakeX[0] = SnakeStartX;
    }
    if (snakeDir == Direction.Up)
        { 
         if  (snakeY[0]>0)
               snakeY[0]-- ;
          else 
              snakeY[0]= Console.WindowWidth - 1 ;
     }
         if (snakeDir== Direction.Down )
 
         {
if (snakeY[0]< Console.WindowWidth - 1)
        snakeY[0]++; 
    else 
        snakeY[0]= SnakeStartY; 
         }
     }
    private static void ClearTail()
{
    Console.ForegroundColor = ConsoleColor.Black;
    Console.SetCursorPosition(snakeX[snakeLen-1], snakeY[snakeLen -  1]);
    Console.Write(snakeBody);
}
private static void DrawSnake()
{
    for (int i = 0; i < snakeLen; i++)
    {
        if (i == 0)
            Console.ForegroundColor = ConsoleColor.Yellow;
        else
            Console.ForegroundColor = ConsoleColor.Blue;

        Console.SetCursorPosition(snakeX[i], snakeY[i]);
        Console.Write(snakeBody);
    }
}
private static void InitSnakePoints()
{
    int x = SnakeStartX;
    int y = SnakeStartY;

    snakeLen = 2;
    for (int i = 0; i < snakeLen; i++)
    {
        snakeX[0] = x--;
        snakeY[0] = y;
    }
}
   }
}

What I have tried:

    static void Main(string[] args)
    {

        Console.CursorVisible = false;
        InitSnakePoints();
        CreateHook();
        while (true)
        {
            DrawSnake();
            Thread.Sleep(200);
            ChangeDirection();
            MoveSnake();
            if (IsFindHook())//<-----------------here
            {
                IncreaseLen5();
                CreateHook();
            }
        }
    }
private static void IncreaseLen5(){
           for (int i=0;   i<5;  i++)
              IncreaseLen();
       }
          private static void IncreaseLen(){

    snakeX[snakeLen] = snakeX[snakeLen - 1];
    snakeY[snakeLen] = snakeY[snakeLen - 1];
}
private static bool IsFindHook()
{
    if (snakeX[0] == hookX)
        if (snakeY[0] == hookY)
            return true;
    return false;
}

Why does it not work at runtime? Thank you for your help.

Posted 29-Jul-21 20:52pm

Mehdi Naseri Jul2021

Updated 30-Jul-21 8:35am

Add a Solution

Comments

Richard MacCutchan 30-Jul-21 3:23am

"Why does it not work at runtime"
Probably because there is something wrong in all that code. Instead of just dumping all your code here and expecting someone to fix it, you need to explain exactly where the problem lies, what is supposed to happen, and what actually happens.

2 solutions

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2021-07-29T21:34:00

Compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:

Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16

Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:

C#

private int Double(int value)
   {
   return value * value;
   }

Once you have an idea what might be going wrong, start using the debugger to find out why. Put a breakpoint on the first line of the method, and run your app. When it reaches the breakpoint, the debugger will stop, and hand control over to you. You can now run your code line-by-line (called "single stepping") and look at (or even change) variable contents as necessary (heck, you can even change the code and try again if you need to).
Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?
Hopefully, that should help you locate which part of that code has a problem, and what the problem is.
This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!

Patrice T · Answer 2 · 2021-07-30T08:35:00

Quote:
Why does it not work at runtime? Thank you for your help.

The problem may be in the fact that you set position of next part of body, do not update snakeLen

C#

private static void IncreaseLen5(){
           for (int i=0;   i<5;  i++)
              IncreaseLen();
       }

private static void IncreaseLen(){
    snakeX[snakeLen] = snakeX[snakeLen - 1];
    snakeY[snakeLen] = snakeY[snakeLen - 1];
}

Your code do not behave the way you expect, or you don't understand why !

There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]

Debugging C# Code in Visual Studio - YouTube[^]

The debugger is here to only show you what your code is doing and your task is to compare with what it should do.

I want to increase the length of the snake by eating each piece.

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

I want to increase the length of the snake by eating each piece.

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

Existing Members

...or Join us