C#基础练习

1、冒泡排序

namespace _0
{
    class Program
    {
        public static int[] BubbleSort(int[] arr)
        {
            for (int i = ; i < arr.Length - ; i++)
            {
                for (int j = ; j < arr.Length - ; j++)
                {
                    if (arr[j] > arr[j + ])
                    {
                        int temp = arr[j];
                        arr[j] = arr[j + ];
                        arr[j + ] = temp;
                    }
                }
            }
            return arr;
        }
        static void Main(string[] args)
        {
            int[] numbers = { , , -, , , , , -, ,  };
            int[] result = BubbleSort(numbers);
            for (int i = ; i < result.Length; i++)
            {
                Console.Write("{0} ", result[i]);
            }
            Console.ReadKey();
        }
    }
}

2、100~999之间的水仙花数

namespace _0
{
    class Program
    {
        public static bool Daffodils(int arr)
        {
            int hundreds = arr / ;  // 获取百位数
            int ten = arr /  % ;  // 获取十位数
            int single = arr % ;  // 获取个位数
            int n = (hundreds * hundreds * hundreds) +
                    (ten * ten * ten) +
                    (single * single * single);
            if (arr == n)
            {
                return true;
            }
            return false;
        }
        static void Main(string[] args)
        {
            for (int i = ; i < ; i++)
            {
                bool flag = Daffodils(i);
                if (flag)
                {
                    Console.WriteLine("Daffodils: {0}", i);
                }
            }
            Console.ReadKey();
        }
    }
}

3、取出数组中最大值和最小值

namespace _0
{
    class Program
    {
        public static int[] ReturnMaxAndMin(int[] arr)
        {
            int[] result = { arr[], arr[] };
            for (int i = ; i < arr.Length; i++)
            {
                if (arr[i] > result[])
                {
                    result[] = arr[i];
                }
                else if (arr[i] < result[])
                {
                    result[] = arr[i];
                }
            }
            return result;
        }
        static void Main(string[] args)
        {
            int[] arrary = { , , , , , , -, , - };
            int[] numbers = ReturnMaxAndMin(arrary);
            Console.WriteLine("Max number: {0}, Min number: {1}", numbers[], numbers[]);
            Console.ReadKey();
        }
    }
}