C Program to draw spiral

# include <graphics.h> 
 # include<conio.h> 
# include<dos.h> 
#include<alloc.h> 
#include<math.h>
void main() 
{ 
int gm,gd=DETECT; 
float x,y,x1,y1,i; 
initgraph(&gd,&gm,””); 
x=100; 
y=100; 
for(i=0;i<=360;i+=0.005) 
{ 
 x=x*cos(i*3.142/180)+y*sin(i*3.142/180); 
y=x*sin(i*3.142/180)+y*cos(i*3.142/180); 
 putpixel((int)x+200,(int)y+200,15); 
} 
getch(); 
}