一些递归使用场景的C#实现

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递归的C#实现

1：计算数组{1,1,2,3,5,8.......} 第30位值

class Program
    {
staticvoid Main(string[] args)
        {
            Console.WriteLine(Method1(0));
            Console.WriteLine(Method1(1));
            Console.WriteLine(Method1(2));
            Console.WriteLine(Method1(3));
            Console.WriteLine("……");
            Console.WriteLine(Method1(30));
        }

staticint Method1(int n)
        {
if (n <2)
            {
return1;
            }
else
            {
return Method1(n -1) + Method1(n -2);
            }
        }
    }

2：计算1+2+3+4+...+100的值

class Program
    {
staticvoid Main(string[] args)
        {
            Console.WriteLine(Method1(0));
            Console.WriteLine(Method1(1));
            Console.WriteLine(Method1(2));
            Console.WriteLine(Method1(3));
            Console.WriteLine("……");
            Console.WriteLine(Method1(100));
        }

staticint Method1(int i)
        {
if (i ==0)
return0;
return Method1(i -1) + i;
        }
    }

3：计算1 -2 +3 +-4+ 5- 6 + 7 - 8 + 9的值

class Program
    {
staticvoid Main(string[] args)
        {
            Console.WriteLine(Method1(0));
            Console.WriteLine(Method1(1));
            Console.WriteLine(Method1(2));
            Console.WriteLine(Method1(3));
            Console.WriteLine("……");
            Console.WriteLine(Method1(100));
        }

//1 -2 +3 +-4+ 5- 6 + 7 - 8 + 9
staticint Method1(int i)
        {
if (i ==0)
return0;
if (i ==1)
return1;
return i%2==0? Method1(i -1) - i : Method1(i -1) + i;
        }
    }

4：汉诺塔

staticvoid Main(string[] args)
        {
            Hanoi(5, 'A', 'B', 'C');
            Console.ReadLine();
        }

publicstaticvoid Hanoi(int n, char A, char B, char C)
        {
//汉诺塔问题
//将n个盘子从A座借助B座，移到C座
if (n ==1) Move(A, C);
else
            {
                Hanoi(n -1, A, C, B);
                Move(A, C);
                Hanoi(n -1, B, A, C);
            }

        }

publicstaticvoid Move(char startPlace, char endPlace)
        {
            Console.WriteLine("Move {0} To {1}", startPlace, endPlace);
        }