C#基礎

標籤：

    class Program    {        static void Main(string[] args)        {            #region 交換兩個變數            /*            int num1 = 10;            int num2 = 20;            //1、聲明第三個變數            int temp = num1;            num1 = num2;            num2 = temp;            //2、不聲明第三個變數，加減法(只能是數字)            num1 = num1 + num2;            num2 = num1 - num2;            num1 = num1 - num2;            Console.WriteLine("num1={0} , num2={1}", num1, num2);            Console.ReadKey();            */            #endregion            #region 求兩個數的最大值            /*            int max = GetMaxVal(10, 20);            Console.WriteLine(max);            Console.ReadKey();            */            #endregion            #region 求1-100之間所有奇數的和            /*            int sum = GetSum(100);            Console.WriteLine(sum);            Console.ReadKey();            */            #endregion            #region 求數組中的最大值            /*            int[] array = new int[] { 10, 50, 30, 60, 80, 70, 40, 20, 90 };            int max = GetMaxVal(array);            Console.WriteLine(max);            Console.ReadKey();            */            #endregion        }        /// <summary>        /// 求數組中的最大值        /// </summary>        /// <param name="array">數組</param>        /// <returns></returns>        private static int GetMaxVal(int[] array)        {            int temp = array[0];            for (int i = 0; i < array.Length; i++)            {                if (array[i] > temp)                    temp = array[i];            }            return temp;        }        /// <summary>        /// 求1到某個數之間所有奇數的和        /// </summary>        /// <param name="p"></param>        /// <returns></returns>        private static int GetSum(int p)        {            int sum = 0;            for (int i = 0; i < 100; i++)            {                if (i % 2 != 0)                {                    sum += i;                }            }            return sum;        }        /// <summary>        /// 擷取兩個數的最大值        /// </summary>        /// <param name="p1">數值1</param>        /// <param name="p2">數值2</param>        /// <returns></returns>        private static int GetMaxVal(int p1, int p2)        {            return p1 > p2 ? p1 : p2;        }    }

 

C#基礎