n个桃,每过一天吃1/2+1个,7天后剩一个,原来有几个桃?
- public int peach(int day)
- {
- if (day == 7)
- {
- return 1;
- }
- int sum = (peach(day + 1) + 1) * 2;
- return sum;
- }
一个人赶一群羊去卖,每过一个村子卖出1/3+1只,7个村子后还剩2只,原来有几只羊?
- public double sheep(int cun)
- {
- if (cun == 7)
- {
- return 2;
- }
- double sum = (double)(sheep(cun + 1) + 1) * 3;
- return sum;
- }