Write a program to implement polygon filling

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<dos.h>

void fill_right(int x,int y)

{

if((getpixel(x,y)!=WHITE)&&(getpixel(x,y)!=RED))

{

putpixel(x,y,RED);

fill_right(++x,y);

x=x-1;

fill_right(x,y-1);

fill_right(x,y+1);

}

delay(1);

}

void fill_left(int x,int y)

{

if((getpixel(x,y)!=WHITE)&&(getpixel(x,y)!=RED))

{

putpixel(x,y,RED);

fill_right(--x,y);

x=x+1;

fill_right(x,y-1);

fill_right(x,y+1);

}

delay(1);

}

void main()

{

int x,y,n,i;

int get=DETECT,gm;

initgraph(&get,&gm,"c:\\tc\\bgi");

clrscr();

line(50,50,200,50);

line(200,50,200,300);

line(200,300,50,300);

line(50,300,50,50);

x=100;

y=100;

fill_right(x,y);

fill_left(x-1,y);

getch();

}

OUTPUT

Write a program to implement character stuffing

#include<stdio.h>                                                 

#include<conio.h>

#include<string.h>

#include<process.h>

void main()            

{

int i=0,j=0,n,pos;

char a[20],b[50],ch;

clrscr();

printf("enter string\n");

scanf("%s",&a);

n=strlen(a);

printf("enter position\n");

scanf("%d",&pos);

if(pos>n)

{

printf("invalid position, Enter again :");

scanf("%d",&pos);

}

printf("enter the character\n");

ch=getche();

b[0]='d';

b[1]='l';

b[2]='e';

b[3]='s';

b[4]='t';

b[5]='x';

j=6;

while(i<n)

{

if(i==pos-1)

{

b[j]='d';

b[j+1]='l';

b[j+2]='e';

b[j+3]=ch;

b[j+4]='d';

b[j+5]='l';

b[j+6]='e';

j=j+7;

}

if(a[i]=='d' && a[i+1]=='l' && a[i+2]=='e')

{

b[j]='d';

b[j+1]='l';

b[j+2]='e';

j=j+3;

}

b[j]=a[i];

i++;

j++;

}

b[j]='d';

b[j+1]='l';

b[j+2]='e';

b[j+3]='e';

b[j+4]='t';

b[j+5]='x';

b[j+6]='\0';

printf("\nframe after stuffing:\n");

printf("%s",b);

getch();

}

OUTPUT