[转]C#算法 循环

1./*正整数反转*/

            int initialData = 0;
            string finallyData = string.Empty;
            do
            {
                Console.WriteLine("请输入一个整数：");
                initialData = int.Parse(Console.ReadLine());
            } while (initialData <= 0);
            while (initialData > 0)
            {
                finallyData += (initialData % 10).ToString();
                initialData = initialData / 10;
            }
            Console.WriteLine(finallyData);
            Console.ReadKey();

2./*杨辉三角*/

            int[,] array = new int[6, 6];
            array[0, 0] = 1;
            for (int i = 1; i < 6; i++)
            {
                array[i, 0] = 1;
                array[i, i] = 1;
                for (int j = 1; j < i; j++)
                {
                    array[i, j] = array[i - 1, j - 1] + array[i - 1, j];
                }
            }
            for (int k = 0; k < 6; k++)
            {
                for (int m = 0; m <= k; m++)
                {
                    Console.Write("{0}\t",array[k,m]);
                }
                Console.WriteLine();
            }

3./*编程实现求出若干个整数之和为500的连续整数的所有组合（例如98 99 100 101 102）*/

            for (int i = 1; i <= 250; i++)
            {
                int j = i;//初始化第一个连续整数（因为是连续整数，遍历上限是250）
                int s = i;
                while (s < 500)
                {
                    j++;
                    s = s + j;
                }
                if ((j != i) && (s == 500))
                {
                    for (int k = i; k <= j; k++)
                    {
                        Console.Write("{0} ", k);
                    }
                    Console.WriteLine();
                }
            }

4./*产生一个int数组，长度为100，并向其中随机插入1--100，要求不重复*/

            int[] intArr = new int[100];
            ArrayList myList = new ArrayList();
            Random r = new Random();
            while (myList.Count < 100)
            {
                int num = r.Next(1, 101);
                if (!myList.Contains(num))
                    myList.Add(num);
            }
            for (int i = 0; i < 100; i++)
            {
                intArr[i] = (int)myList[i];
            }
            for (int i = 0; i < intArr.Length; i++)
                Console.Write(intArr[i] + " ");

5./*用1分，2分，5分的面额，组成1元*/

            int x = 0;
            for (int i = 0; i < 21; i++)
            {
                for (int j = 0; j < 51; j++)
                {
                    for (int k = 0; k < 101; k++)
                    {
                        if ((5 * i + 2 * j + k) == 100)
                        {
                            x++;
                            Console.WriteLine("方法{0}：{1}+{2}+{3}=10元", x, i, j, k);
                        }
                    }
                }
            }
            Console.WriteLine("共有{0}中方法！", x);