C program to implement Bresenham Circle Drawing Algorithm

# include<stdio.h> 
# include<conio.h> 
# include <graphics.h> 
# include<math.h> 
#include<dos.h> 
/* Function for plotting the co-ordinates at four different angles that are placed 
at egual distences */ 
void plotpoints(int xcentre, int ycentre,int x,int y) 
{ 
int color=5; 
putpixel(xcentre+x,ycevtre+y,color); 
putpixel(xcentre+x,ycevtre-y,color); 
putpixel(xcentre-x,ycevtre+y,color); 
putpixel(xcentre-x,ycevtre-y,color); 
putpixel(xcentre+y,ycevtre+x,color); 
putpixel(xcentre+y,ycevtre-x,color); 
putpixel(xcentre-x,ycevtre+x,color); 
putpixel(xcentre-y,ycevtre-x,color); 
} 
/* Function for calculating the new points for(x,y)co-ordinates. */ 
void cir(int xcentre, ycentre, int radius) 
{ 
int x,y,p; 
x=0; y=radius; 
plotpoints(xcentre,ycentre,x,y); 
p=1-radius; 
while(x<y) 
{ 
if(p<0) 
p=p+2*x+1: 
else 

{ 
 y--; 
p=p+2*(x-y)+1; 
} 
x++; 
plotpoints xcentre, ycentre,x,y); 
delay(100); 
} 
} 
/* The main function that takes (x,y) and ‘r’ the radius from keyboard and 
activates other functions for drawing the circle */
void main() 
{ 
intgd=DETECT,gm,xcentre=200,ycentre=150,redius=5; 
printf(“\n enter the center points and radius :\n”); 
scanf(“%d%d%d”, &xcentre, &ycentre, &radius); 
clrscr(); 
initgraph(&gd,&gm,””); 
putpixel(xcentre,ycentre,5); 
cir(xcentre,ycentre,redius); 
getch(); 
closegraph(); 
}