Net基础篇_学习笔记_第九天_数组_三个练习

练习一：

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace _数组练习01
 {
     class Program
     {
         static void Main(string[] args)
         {
             string str = null;
             string[] names = { "老杨","老李","老赵","老孙","老沈"};
             for (int i = ; i < names.Length; i++)
             {
                 str += names[i] + "|";
             }
             Console.WriteLine(str);
             Console.ReadKey();
         }
     }
 }

优化为：

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace _数组练习01
 {
     class Program
     {
         static void Main(string[] args)
         {
             string str = null;
             string[] names = { "老杨","老李","老赵","老孙","老沈"};
             for (int i = ; i < names.Length-; i++)
             {
                 str += names[i] + "|";
             }
             Console.WriteLine(str+names[names.Length-]);
             Console.ReadKey();
         }
     }
 }

练习二：如遇正数，将这个位置元素的值加1，如遇负数，将这个位置元素的值减1，如遇0，则不变。

int nums={0，5，-8，-41，5，94，-1，-22}；

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace _数组练习01
 {
     class Program
     {
         static void Main(string[] args)
         {
             int[] nums = { ,,,-,-,-,};
             for (int i = ; i < nums.Length; i++)
             {
                 if (nums[i] > )
                 {
                     nums[i] += ;
                 }
                 else if (nums[i] < )
                 {
                     nums[i] -= ;
                 }
             }
             for (int i = ; i < nums.Length; i++)
             {
                 Console.WriteLine(nums[i]);
             }
             Console.ReadKey();
         }
     }
 }

联系三：将一个字符串数组的元素顺序进行反转

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace _数组练习01
 {
     class Program
     {
         static void Main(string[] args)
         {
             string[] names  = { "a", "b", "c" ,"d"};
             for (int i = ; i <names.Length/; i++)
             {
                 //交换两个变量最简单的方式就是声明第三方的一个变量。
                 string _temp = names[i];
                 names[i] = names[names.Length -  - i];
                 names[names.Length -  - i] = _temp;
             }
             for (int i = ; i < names.Length; i++)
             {
                 Console.WriteLine(names[i]);
             }
             Console.ReadKey();
         }
     }
 }