it goes something like this...
Code:


int main_grid[5][10]

1 0 1 0 1 1 0 1 0 1
1 0 1 0 1 1 0 1 0 1
1 0 1 0 1 1 0 1 0 1
1 0 1 0 1 1 0 1 0 1
1 0 1 0 1 1 0 1 0 1



char display_grid[11][21]

+-+-+-+-+-+-+-+-+-+-+
|X| |X| |X|X| |X| |X|
+-+-+-+-+-+-+-+-+-+-+
|X| |X| |X|X| |X| |X|
+-+-+-+-+-+-+-+-+-+-+
|X| |X| |X|X| |X| |X|
+-+-+-+-+-+-+-+-+-+-+
|X| |X| |X|X| |X| |X|
+-+-+-+-+-+-+-+-+-+-+
|X| |X| |X|X| |X| |X|
+-+-+-+-+-+-+-+-+-+-+



so it's like transferring another array to another array with similar size and data type. I notice a pattern...

Code:
display main			display	main	
row	row	difference	col	col	difference
0	-	-		0	-	-
1	0	1		1	0	1
2	-	-		2	-	-
3	1	2		3	1	2
4	-	-		4	-	-
5	2	3		5	2	3
6	-	-		6	-	-
7	3	4		7	3	4
8	-	-		8	-	-
.	.	.		.	.	.
.	.	.		.	.	.
In theory, you can get the display = main - difference, but I can't it t work correctly...

Code:
#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>

using namespace std;

int main()
{
    int i, j, , x, y, m, n;
    char d=32; //ascii code for white space " "
   char display_grid[11][21]={};
    
    int main_grid[5][10]={{1,0,1,0,1,1,0,1,0,1},
                           {1,0,1,0,1,1,0,1,0,1},
                           {1,0,1,0,1,1,0,1,0,1},
                           {1,0,1,0,1,1,0,1,0,1},
                           {1,0,1,0,1,1,0,1,0,1}}; //sample values
                           

    for ( i=0 ; i<5 ; i++ )
    {
        for ( j=0 ; j<5 ; j++ )
            cout<<main_grid[i][j]<<" ";
        cout<<endl;
    }
    
    cout<<"\n\n\n";
        
        for ( i=0 ; i<11 ; i++ )
        {
            
            n=0;
            for ( j=0 ; j<21 ; j++ )
            {
                
                if (( i%2==0 ) && ( j%2==0 ))
                    display_grid[i][j]='+';
                   
                else if (( i%2==0 ) && ( j%2!=0 ))
                    display_grid[i][j]='-';
                        
                else if (( i%2!=0 ) && ( j%2==0 ))
                    display_grid[i][j]='|';

                else if (( i%2!=0 ) && ( j%2!=0 ))
                {
                for ( m=0 ; m<5 ; m++ )
                {
                    for ( n=0 ; n<5 ; n++ )
                    {
                        if ( main_grid[i-m][j-m]!=0 )
                        display_grid[i][j]='X';
                        else
                        display_grid[i][j]=d;
                    }
                }
                
            }
            
        }
    }
          
           
    
    for ( i=0 ; i<11 ; i++ )
        {
            for ( j=0 ; j<21 ; j++ )
            {
                
            cout<<display_grid[i][j];
            }
            cout<<endl;
        }

    getch();
    return 0;
}
What's wrong with the loops?