#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;}