字符串函数 值的互换

 /*string str = "a|b|c|d|e";
            string[] strs = str.Split('|');
            foreach (string item in strs)
            {
                Console.WriteLine(item);
            }
            Console.ReadKey();*/

            #region 讲数组转换成字符串
            /*string str = "abcde";
            char[] strs = str.ToArray();
            //ToArray()的实现
            char[] chars = new char[str.Length];
            for (int i = 0; i < str.Length; i++)
            {
              chars[i]=str[i];
            }
            foreach (char item in chars)
            {
                Console.WriteLine(item);
            }
            Console.ReadKey();*/

            string str = ",你好 不好,";
            string str1 = str.Trim(',');
            Console.WriteLine(str1);
            Console.WriteLine(str);
            #endregion
            Console.ReadKey();

 

   值的互换

 

//变量和变量所对应的值它们是两个东西，你可以认为它们存储在内存中两个位置，用一条线连接起来。想象一下两杯水的互换问题(郑寒松曰)，李硕的思考：第三个杯子咋没水呢？
            int numb1 = 10;
            int numb2 = 20;
            int temp = 0;

            //numb1=num2 并不是说num1这个变量指向了numb2这个变量，而是numb1这个变量指向了numb2这个变量指向的值

            temp = numb1;
            numb1 = numb2;
            numb2 = temp;
            Console.WriteLine("numb1的值为{0},numb2的值为{1}，temp的值为{2}",numb1,numb2,temp);
            Console.ReadKey();