/**
* 打印一个圆
* 假设圆上一点为(x,y)
*/
private void Round(){
int r = 8;
for (int y = 0; y <= 2 * r; y +=2) {//y的步长为2,改变y的步长可以将圆形变成椭圆
int x = (int)Math.round(r - Math.sqrt(2*r*y-y*y)); //Math.sqrt(r * r-(r-y) *(r-y))转化得
int len = 2 * (r - x); //对称的两*之间的距离
for (int i = 0; i <= x; i++) { //距离控制台左边的距离
System.out.print(' ');
}
System.out.print('*');
for (int j = 0; j <= len; j++) {
System.out.print(' ');
}
System.out.println('*');
}
}
运行结果: