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  • 140821 字符串,数字,日期及应用举例

    brerk   彻底终断循环,跳出for语句

    continue 中断当前循环,进行下一循环

    s.Length            s的长度
     
     
     
    s.Trim()             去除两边空格
     
    s.TrimStart()        去除前面的空格
     
    s.TrimEnd()           去除后面的空格
     
     
     
    s.ToUpper()        字母变大写
     
    s.ToLower()        字母变小写
     
     
     
    s.Substring()      1.截取位置到最后  2.(截取位置,长度)
     
     
     
    s.StartsWith()     判断字符串开头是否匹配
     
    s.EndsWith()      判断字符串末尾是否匹配
     
    s.Contains()     中间
     
     
     
    s.IndexOf()        从前面数第一次出现的位置
     
    s.LastIndexOf()    从后面数第一次出现的位置
     
     
     
    s.Replace()         替换

    例子:

              //判断日期是否正确

                Console.Write("输入年份");

                int i = Convert.ToInt32(Console.ReadLine());

                Console.Write("输入月份");

                int m = Convert.ToInt32(Console.ReadLine());

                Console.Write("输入日期");

                int n = Convert.ToInt32(Console.ReadLine());

     

     

     

                if (i >= 1 && i <= 9999)

                {

                    if (i % 400 == 0 || i % 4 == 0 && i % 100 != 0)

                    {

                        if(m>=1&&m<=12)

                        {

                            if (n >= 1 && n <= 31 && (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12))

                            {

                                Console.WriteLine("您输入的日期正确");

                            }

                            else if(n>=1&&n<=30&&(m==4||m==6||m==9||m==11))

                            {

                                Console.WriteLine("您输入的日期正确");

                            }

                            else if (n >= 1 && n <= 29)

                            {

                                Console.WriteLine("您输入的日期正确");

                            }

                            else

                            {

                                Console.WriteLine("您输入的数值无意义");

                            }

                        }

                        else

                        {

                            Console.WriteLine("您输入的数值无意义");

                        }

     

     

                    }

                    else

                    {

                        if (m >= 1 && m <= 12)

                        {

                            if (n >= 1 && n <= 31 && (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12))

                            {

                                Console.WriteLine("您输入的日期正确");

                            }

                            else if (n >= 1 && n <= 30 && (m == 4 || m == 6 || m == 9 || m == 11))

                            {

                                Console.WriteLine("您输入的日期正确");

                            }

                            else if (n >= 1 && n <= 28)

                            {

                                Console.WriteLine("您输入的日期正确");

                            }

                            else

                            {

                                Console.WriteLine("输入错误");

                            }

                       }

                        else

                        {

                            Console.WriteLine("输入错误");

                        }

                    }

                }

                else

                {

                    Console.WriteLine("输入错误");

                }

     

     

     

    // 截取身份证日期

                 Console.WriteLine("请输入身份证号:");

                 string i = Convert.ToString(Console.ReadLine());

                    if(i.Length==18)

                    {

                        Console.WriteLine(i.Substring (6,8));

                    }

                   else

                {

                     Console.WriteLine("输入错误");

                }

     

    //判断邮箱

    Console.Write("输入邮箱:");

                string s = Console.ReadLine();

                bool m=s.StartsWith(" ");

                bool n=s.StartsWith(".");

                int a = s.IndexOf("@");

                int c = s.LastIndexOf("@");

                bool b = s.Contains(".");

                bool d = s.Contains("..");

                if (m == n == d == false && a != 0 && a != c && b == true)

                {

                    Console.WriteLine("yes");

                }

                else

                    Console.WriteLine("not");

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  • 原文地址:https://www.cnblogs.com/jackjms/p/3929333.html
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