1d grid example for malic

1dgrid.c

#include <stdio.h>

int main()
{
    // Notice, there are no brackets around the rows this time.
    // This is a 1-dimensional array. Even though it looks 2d in
    // the code, it's one long list to the computer.
    //
    // Using a 1-dimensional array, we can still treat the data 
    // inside of it as a grid in our code, though.
    int flat_grid[] = {
        0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 14 rows
        0,0,0,0,1,1,1,1,1,1,1,1,1,0,
        0,0,0,0,1,0,0,1,1,1,0,0,1,0,
        0,0,0,0,1,0,1,1,1,1,0,1,1,0,
        0,0,0,0,1,1,1,1,1,1,1,1,1,0,
        0,0,0,0,1,1,1,1,0,1,1,1,1,0,
        0,0,0,0,1,1,1,1,1,0,1,1,1,0,
        0,0,0,0,1,1,1,1,0,0,1,1,1,0,
        0,0,0,0,1,1,1,1,1,1,1,1,1,0,
        0,0,0,0,1,1,1,1,0,0,1,1,1,0,
        0,0,0,0,1,1,1,1,0,0,1,1,1,0,
        0,0,0,0,0,1,1,1,1,1,1,1,0,0,
        0,0,0,0,0,0,0,0,1,0,0,0,0,0,
        0,0,0,1,1,0,0,0,1,0,0,0,1,1,
        0,0,0,0,1,1,1,1,1,1,1,1,1,0,
        0,0,0,0,0,0,0,1,1,1,0,0,0,0,
        0,0,0,0,0,0,0,0,1,0,0,0,0,0,
        // to 17 columns
    };

    // lets set up some variables we'll need...
    int columns, x, // no. of "columns", and our index into them is "x"
        rows, y,    // no. of "rows", and our index into them is "y"
        position,   // a variable to hold our "position" in the grid
        value;      // a variable to hold the "value" at the "position"

    rows = 14;
    columns = 17;

    for(x=0; x < columns; x++) {
        for(y=0; y < rows; y++) {
            // We don't have a convenient 2-d array this time, but thats ok!
            // We just need to calculate the position with a little "math"...
            position = (x * rows) + y;

            //... and get the value at that position!
            value = flat_grid[position];

            // the rest looks pretty much the same as before...
            if (value == 1) {
                putc('@', stdout);
            } else {
                putc(' ', stdout);
            }
        }
        putc('\n', stdout); // end of line
    }
}

/*
here's what it looks like when i run it:
$ ./1dgrid 
              
    @@@@@@@@@ 
    @  @@@  @ 
    @ @@@@ @@ 
    @@@@@@@@@ 
    @@@@ @@@@ 
    @@@@@ @@@ 
    @@@@  @@@ 
    @@@@@@@@@ 
    @@@@  @@@ 
    @@@@  @@@ 
     @@@@@@@  
        @     
   @@   @   @@
    @@@@@@@@@ 
       @@@    
        @     
*/

boo, it looks better on a black+white background :)