CODE:

/* ring1.c */
#include 
#include 
main()
float r, th, dth, x, y;
dth = 0.02 * M_PI;
r = 0.5;
for ( th=0.0;th
#include 
#define MAPR 18
#define PI 3.1415926535
 
int round(double);
 
int main(void){
	double r,th,dth,x,y;
	char map[MAPR*2+1][MAPR*4+1];
	int i,j;
	for(i=0;i<MAPR*2+1;i++) for(j=0;j<MAPR*4+1;j++) map[i][j] = ' ';
	r = (double)MAPR;
	dth = 0.005;
	for(th=0.0;th<=2.0;th+=dth){
		x = MAPR+round(r*cos(th*PI));
		y = MAPR*2+round(r*2*sin(th*PI));
		map[x][y] = '*';
	}
	for(i=0;i<MAPR*2+1;i++,putchar('\n')) for(j=0;j<MAPR*4+1;j++) putchar(map[i][j]);
	return 0;
}
 
int round(double a){
	return (int)(a + 0.5);
}