3点画弧，三点绘制圆弧就是已知三点，通过这三点画圆弧。在画圆弧时先选择三点绘制圆弧命令，然后选定圆弧的起点（第一点）、再选定第二点、最后选定终点（第三点），三点绘制圆弧完成。在选择起点、第二点和终点时，可以按顺时针方向选取，也可以按逆时针方向选取。-3 stipple arc, three three-point arc is drawn is known, an arc through three points. When drawing an arc to three points to

编程求Josephus问题：m个小孩围成一圈，从第一个小孩开始顺时针方向每数到第n个小孩时这个小孩就离开，最后剩下的一个小孩是胜利者。求第几个小孩是胜利者。(Programming for Josephus problem: m children are surrounded by a circle. From the first child starts clockwise, every child counts to n child. The last child is the winner