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There are 4 red cards and 4 blue cards, the moderator first take any two, and then in a, B, C three people put any two cards on their foreheads, A, B, c three people can see the other two people's hands on the forehead, after reading let them guess what color on their forehead card, A said don't know, B said don't know, C said don't know, then a said to know. For advice on how to reason, A is how to know. If you use the program, how to achieve it. Idea: The purpose is to derive a color, beca

B = "a" + "true";System.out.println ((A = = b)); result = TrueString a = "a3.4";String B = "a" + 3.4;System.out.println ((A = = b)); result = TrueAnalysis: JVM for string constant "+" number connection, the program compile period, the JVM will be the constant string "+" connection optimization to the concatenated value, take "a" + 1, the compiler is optimized in class is already A1. The value of its string constants is determined at compile time, so the final result of the above program is true

Today's content:Knowledge Point one: RegularWhat is a regular:is to use a series of characters with special meanings to form a set of rules that are used to describe a character string.The regular is used to remove a small string of rules in a large string.Why use the Regular:1. User Registration2. Crawler programsHow to use:Re.findallRe.findall module:\w letters, numbers, underscoresPrint (Re.findall (' \w ', ' yangzz:age_18 '))\w no letters, numbers, underscoresPrint (Re.findall (' \w ', ' yan

reference "value" (that is, the memory address), which forces the reference to point only to the object that was initially pointed to, and changes its point to cause a compile-time error.Final is not responsible for the change in the object it points to. several examples of string constant pool problems Here are a few common examples of comparative analysis and understanding:String A = "A1";String B = "a" + 1;System.out.println ((a = = b));//result = TrueString a = "atrue";String B = "a" + "tru

= 1000000000000000L; System.out.println(l); //定义float类型的变量 float f = 12.34F; System.out.println(f); //定义double类型的变量 double d = 12.34; System.out.println(d); //定义char类型的变量 char c = ‘a‘; System.out.println(c); //定义boolean类型的变量 boolean bb = false; System.out.println(bb); }}Considerations for 1.1.1 Variable Definition

PHP does not seem to be the same as the ASP "/" to represent the root directory, replaced by $_server[' Document_root ', others are the same: ... /represents an upward layer./represents the current layer. If a/b/c/s.php now wants to invoke the/bb/s2.txt under the root directory, then: $RootDir = $_server[' Document_root '];$fireDir = "$RootDir/bb/s2.txt"; Or: ". /.. /.. /

: JVM for string constant "+" connection, the program compile period, the JVM will be the constant string of "+" connection optimization to the value after the connection, take "a" + 1, after the compiler optimization in class is already A1. The value of the string constant at compile time is determined, so the final result of the above program is true. Example 4: Java code String a = "AB"; String BB = "B"; String B = "a" +

First, awk uses ordinary variables in the shell Method 1: Use the quotation mark method Aa= "Hello" awk ' BEGIN {print ' $aa '} ' Output $AA awk ' BEGIN {print ' $aa '} ' Output Hello awk ' BEGIN {print ' ' $aa '} ' Output empty Aa= "hello! Coder " awk ' BEGIN {print ' $aa '} ' Error, double quotes do not match, because space appears in the middle awk ' BEGIN {print ' ' $aa ' '} ' Hello! can be displayed normally Coder Method 2: Using the-V method Awk-v varaa= "$aa" ' BEGIN {print Varaa}

assign it to the string variable S2. Judge S1+s2= "A" in the character table, then s1=s1+s2= "a" (see table 2, second row). 4) Read the next character a in the image data stream and assign it to the string variable S2. Judge S1+s2= "AA" is not in the string table, output s1= "a" in the word list of index 0H, and at the end of the string table for s1+s2= "AA" to add index 4H, and s1=s2= "a" (see table 2, the third row). 5) Read the next character B assigned to S2. Judge S1+s2= "AB" is not in the

') --------------------------------------------------------------------- -323 -- It can also be a negative number. SQL> c/1999-01-12/2999-10-12 1 * select to_date ('2017-10-12 ', 'yyyy-mm-dd')-to_date ('2017-12-01', 'yyyy-mm-dd') from dual SQL>/ TO_DATE ('2017-10-12 ', 'yyyy-MM-DD')-TO_DATE ('2017-12-01 ', 'yyyy-MM-DD ') --------------------------------------------------------------------- 365193 Next let's take a look at how TO use interval year to month. SQL> create table

A question about DISTINCT. Some people often ask questions similar to this. The data in the table is as follows: idaabb201734561453554160656416065625066426063898920.00002. expected results are that some people often ask questions similar to this, The data in the table is as follows: ID AA BB 1 123 456 1 4535 54 1 60 6564 1 60 656 2 50 664 2 60 6 3 89 4 40 4242 The expected result is: ID AA BB 1 123 456 2 50

Serialization should be no stranger to everyone, especially now that there is a lot of webapi,json flying around, and serialization operations should often appear on our code.And our most commonly used serialization tool should be Newtonsoft.json, of course you use other tool classes is also no problem, we focus on not this tool, we focus on efficient and customizable control of the serialization operations.First, let's talk about the approximate serialization principle:In general, we pass an en

This article mainly introduces the problem of errors reported by reference in php5.4, and analyzes the problem and solution of errors reported by reference in php5.4 based on the instance form, which has some reference value, if you need it, you can refer to the example in this article to analyze the error message returned when you reference php5.4. We will share this with you for your reference. The details are as follows: There is no problem in transferring references from php5.3 series and e

X5 and X6 and X7; 148, stock price limit. Draw yellow on the candlestick chartStickline (C/ref (c,1) >=1.099,o,c,1,0), Coloryellow; 149, this close for the lowest closing price in n days (%)　　(C-LLV (C,n))/llv (c,n) *100; 150, this close for the highest closing price in n days (%)　　(HHV (C,n)-c)/HHV (c,n) *100;　　 151, the relative position of the stock price in the last n days of running space　　(C-LLV (L,n))/(HHV (h,n)-llv (l,n)) *100;　　 152, n1% to n2% at the top of the stock price (%)　　Aa:=

The problem of string processing into an array: $ str quot; aa: 1, bb: 2, cc: 3, dd: 4 quot; has two requirements: 1. I want to split this string into an array, where aa, bb, cc, and dd are indexes 11, 22, and 33, and 44 are the index values, for example, $ arrArray ([aa] gt; 11, [bb] gt; 22, [cc] gt string processing into an array A string is as follows: $

In this paper, the author analyzes the php5.4 of quoted times. Share to everyone for your reference, as follows: php5.3 Series version and previous version, reference no problem, after upgrading to php5.4, the place of reference, full error Fatal error:call-time pass-by-reference have been removed in F:\work\wamp\www\test\test.php on line 6. take a look at the following example. Example 1, recursive reference, PHP 5.3 and version, test results "; $BB