zoukankan      html  css  js  c++  java
  • 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");

  • 相关阅读:
    Mybatis 自动从数据库生成entity,mapping,dao接口
    ActiveMQ主从配置
    ajax跨域请求,页面和java服务端的写法
    mysql查看连接数和状态,设置连接数和超时时间
    tomcat错误:@HandlesTypes annotation of one or more ServletContentInitializers
    自定义对话框 提示:Unable to add window token null is not for an application
    使用Provider时提示:Unable to get provider...
    使用JFinal-weixin配置微信开发
    redis提示Could not get a resource from the pool(jedis连接池配置)
    mysql配置文件生效顺序
  • 原文地址:https://www.cnblogs.com/jackjms/p/3929333.html
Copyright © 2011-2022 走看看