Example: function recursion. To sell sheep, each village sold before the number of one hundred and One-seconds, after 7 villages left 2, asked how many sheep originally.

public int Qiuyang (int cun)
{
int sum = 0;
if (cun==7)//If the seventh village has 2 left, then the function ends
{
sum = 2;
return sum;
}
sum = (Qiuyang (cun + 1) + 1) * 2; (Number of Next village + 1) * *;
The number of this village is the number of the next village plus one then multiply by 2,
Qiuyang This function is called, we know the number of sheep in the last village.
(Qiuyang (cun + 1) This function is called, cun+1. It means the next village.
return sum;
}
static void Main (string[] args)
{
int sum = new program (). Qiuyang (1);

Console.WriteLine (sum);
Console.ReadLine ();

Example: function recursion. To sell sheep, each village sold before the number of one hundred and One-seconds, after 7 villages left 2, asked how many sheep originally.