C Program to demonstrate rectangles using putpixel and filling them with different fill effects

# Include <graphics.h> 
# Include <conio.h> 
# include <stdlib.h> 
# include <dos.h> 
void main() 
{ 
int gm,gd= DETECT; 

int x1,x2,y1,y2,c,I; 
initgraph(&gd,&gm,’’’’); 
while(!kbhit()) /* until pressing any key this loop continues */ 
 { 
/* To draw rectangle co-ordinatinates are taken randomly */ 
x1=rand()%getmaxx(); 
x2=rand()%getmaxx(); 
y1=rand()%getmaxy(); 
y2=rand()%getmaxy(); 
if (x1>x2) 
{ 
c=x1; /* exchange of x1 and x2 when x1 is >x2 */ 
x1=x2; 
x2=c; 
} 
if(y1>y2) 
{ 
c=y1; /* exchange of y1 and y2 when y1 is > y2 */ 
y1=y2; 
y2=c; 
} 
c=rand()%16; 
/* for rectangle using putpixel */ 
for(I=x1 ;i<=x2;++i) 
{ 
putpixel(I,y1,c); 
delay (1); 
} 
for(i=y1;I<=y2;++i) 
{ 
putpixel(x2,I,c); 
delay(1); 
} 
for(i=x2;i>=x1; i) 
{ 
putpixel(i,y2,c); 
delay(1); 
} 
for(i=y2;I>=y1; i) 
{ 
putpixel(x1,i,c); 
 delay(1); 
} 
setfillsytyle(rand()%12, rand()%8); /* setting the random fill styles and colors 
* 
floodfill(x1+1,y1+1,c); 
delay(200); /* to draw the pixels slowly */ 
} 
getch(); 
closegraph(); /* closes the graph mode */ 
}