2d grid example for malic

2dgrid.c

#include <stdio.h>

#define ROWS    10
#define COLUMNS 7

// This is a 2-dimensional array.
// It makes accessing the values of a 
// bitmap easy by using x/y references.
int grid[ROWS][COLUMNS] = {
    {0,0,0,0,0,0,0}, // 7 columns across
    {0,1,1,0,1,1,0},
    {0,1,1,0,1,1,0},
    {0,0,0,0,0,0,0},
    {0,0,0,1,0,0,0},
    {0,0,0,1,0,0,0},
    {0,0,0,0,0,0,0},
    {0,1,1,1,1,1,0},
    {0,0,1,1,1,0,0},
    {0,0,0,0,0,0,0},
    // 10 columns down
};

int main() {
    int x,y;
    for(x=0; x < ROWS; x++) {
        for(y=0; y < COLUMNS; y++) {
            // to access a value in the bitmap we just reference it with our
            // x/y coordinate.
            int value = grid[x][y];

            if (value == 1) {
                putc('*', stdout); // output a single *
            } else {
                putc(' ', stdout); // or an empty space
            }
        }
        putc('\n', stdout); // print end of line (and begin at next one)
    }
}

/* 
here's what the output looks like
$ ./2dgrid 
       
 ** ** 
 ** ** 
       
   *   
   *   
       
 ***** 
  ***  
       
*/