题目：有5个人坐在一起，问第五个人多少岁云计？他说比第4个人大2岁。问第4个人岁数，他说算开比第3个人大2岁。问第三个人，又说比第2人大两发：岁。问第2个人，说比第一个人大两岁。最后问第Py一个人，他说是10岁。请问第五个人多大？
程序分th析：利用递归的方法，递归分为回推和递推两on个阶段。要想知道第五个人岁数，需知道第四人的练习岁数，依次类推，推到第一人（10岁），再往回推。
程实例序源代码：
以上实例输出结果为：
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