• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 354
  • Last Modified:

Trouble with a two dimensional array - one element replaceing another

I have been trying to write a simple program of connect4 using a 4x4 array. It certiantly sounds simple but for some reason I am having problems with the array itself

#include <iostream>
using namespace std;

void main()
{
      int grid[3][3];
      for(int m=0;m<4;m++)
      {
            for(int n=0;n<4;n++)
            {
                  grid[m][n]=0;
            }
      }
      cout<<grid[0][0]<<" "<<grid[0][1]<<" "<<grid[0][2]<<" "<<grid[0][3]<<endl;
      cout<<grid[1][0]<<" "<<grid[1][1]<<" "<<grid[1][2]<<" "<<grid[1][3]<<endl;
      cout<<grid[2][0]<<" "<<grid[2][1]<<" "<<grid[2][2]<<" "<<grid[2][3]<<endl;
      cout<<grid[3][0]<<" "<<grid[3][1]<<" "<<grid[3][2]<<" "<<grid[3][3]<<endl;
      cout<<endl;
      grid[1][0]=1;
      grid[2][3]=1;
      cout<<grid[1][0]<<" "<<grid[0][3]<<" "<<grid[2][3]<<" "<<grid[3][0]<<endl;
      grid[0][3]=2;
      grid[3][0]=2;
      cout<<grid[1][0]<<" "<<grid[0][3]<<" "<<grid[2][3]<<" "<<grid[3][0]<<endl;
}

After a significant amount of frusteration I scrapped the entire code and tried this code.  The only problem is, after they are all initalized to 0, it prints out the grid perfectly.  When I go to assign values however, any value I put in grid[1][0] ends up in grid[0][3] and vice versa.  Also anything in grid[2][3] ends up in grid[3][0].  My Dev enviroment is Microsoft Visual C++, I installed it on my other computer just to make sure it wasn't a memory problem, but got the exact same result.

This is my first question here so I am still a bit fuzzy on how this works.
0
SpaceMonkey101
Asked:
SpaceMonkey101
  • 2
1 Solution
 
avizitCommented:
int x[10];
means you have 10 integers  x[0] to x[9];


similarly for int grid[3][3];

grid[3][3] is out of bounds.


/abhijit/
0
 
avizitCommented:
changing

 int grid[3][3];  to  int grid[4][4];  made the program work fine .. (atleast on my machine )

/abhijit/
0
 
SpaceMonkey101Author Commented:
Wow, thank you... I knew it was something stupid... heh
0
 
rendaduiyanCommented:
the arry declared is int grid[3][3]
and initialized with 4x4, which is Array boudary write(ABR/ABW).
that is the reason you print such result.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Cloud Class® Course: Microsoft Azure 2017

Azure has a changed a lot since it was originally introduce by adding new services and features. Do you know everything you need to about Azure? This course will teach you about the Azure App Service, monitoring and application insights, DevOps, and Team Services.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now