#include <stdio.h>
#include <stdlib.h>

void fill(char des[20][40], int x, int y, char c)
{
        if(des[x][y]==' ') des[x][y]=c;
        if(des[x][y-1]==' ') fill(des,x,y-1,c);
        if(des[x-1][y]==' ') fill(des,x-1,y,c);
        if(des[x][y+1]==' ') fill(des,x,y+1,c);
        if(des[x+1][y]==' ') fill(des,x+1,y,c);
}

int main(void)
{
        int line,column,i,j;
        char charsel;
        char drawing[20][40];
        FILE *filein=NULL,*fileout=NULL;

        filein=fopen("in","rt");
        fileout=fopen("out","wt");

        for(i=0;i<20;i++)
        {
                for(j=0;j<40;j++)
                fscanf(filein,"%c",&drawing[i][j]);
        }

        printf("Insert line and column number for the start position\n");
        scanf("%d %d",&line,&column);
        getchar();
        printf("Insert the fill character (must not be an empty space)\n");
        scanf("%c",&charsel);

        fill(drawing,line,column,charsel);

        for(i=0;i<20;i++)
        {
                for(j=0;j<40;j++)
                fprintf(fileout, "%c", drawing[i][j]);
        };
        printf("Result has been spewed to file named 'out'");
        fclose(filein);
        fclose(fileout);
        getchar();
        return 0;
}