unit Unit1; interface uses   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,   Dialogs, StdCtrls; type   TForm1 = class(TForm)     Button1: TButton;     Button2: TButton;     Button3: TButton;     Button4: TButton;     Butt…

unit Unit1; interface uses   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,   Dialogs, StdCtrls; type   TForm1 = class(TForm)     Button1: TButton;     Button2: TButton;     procedure Button1Click(Sender: TObject);     pro…

unit Unit1; interface uses   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,   Dialogs, StdCtrls; type   TForm1 = class(TForm)     Button1: TButton;     Button2: TButton;     Button3: TButton;     Button4: TButton;     proc…

unit Unit1; interface uses   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,   Dialogs, StdCtrls; type   TForm1 = class(TForm)     Button1: TButton;     Button2: TButton;     Button3: TButton;     procedure Button1Click(Sen…

function fn(num,div,token){//num需要分割的数字,div多少位分割 token分割字符 num=num+'',div=div||3,token=token||',' return num.replace(/\d/g,function(a,i,str){ var l=str.length%div; if(((i-l+1)%div==0&&i!==str.length-1)||i==l-1) return a+token; else return a; }); }…

select cast('addd' as varchar(4)) from dual;…

==========================第11章 字符和字符串函数==========================震惊:字符串常量属于静态存储类,常量引号中的内容作为指向该字符串存储位置的指针:printf("%s, %p, %c\n","we","are",*"young!");语句执行的结果如下:we, 0x4005e4, y 字符串的数组声明:char str[] = "string A&quo…

=========================================== mysql 相关函数 ================================================= =========================================== 数学函数 ===================================================== 绝对值函数 abs()圆周率函数 PI()开平方根函数 sqrt()求余函数 mod…

第四章 数学函数.字符和字符串 4.2 常用数学函数 方法分三类:三角函数方法(trigonometric method).指数函数方法(exponent method)和服务方法(service method) 4.4 String类型 String类型不是基本类型,而是引用类型(reference type). 4.5.3 使用字符串修改彩票程序 package com.chapter4; import java.util.Scanner; public class LotteryUsing…

[C++实现python字符串函数库]字符串匹配函数startswith与endswith 这两个函数用于匹配字符串的开头或末尾,判断是否包含另一个字符串,它们返回bool值.startswith()函数判断文本的指定范围字符段是否以某个字符开始,endswith()函数判断文本是否以某个字符结束.默认的指定范围为整个字符串: >>> >>> a 'abcdefghijklmn' >>> a.startswith('abc') True >>…