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Transferred from: http://www.cppblog.com/Joe/archive/2011/05/24/147036.aspx When commenting out chunks of code, using "#if 0" is better than using "/**/", because a comment with "/**/" to block the commented out code has nested "/**/", which leads to the commented out area of the code that is not what you want, which is easy to do when the commented out code is large. This is especially true after a period

1. Let's talk about the role of "# If 0/# If 1... # endif" first. You have mentioned a little bit above, but you have not mentioned any key points. We know that the C standard does not provide single-line style annotations such as "//" in C ++, but only provides block annotation functions such, we usually use it to wri

has very limited language constructs: There is no real number, only a very small amount of basic arithmetic operations, and there is no control flow other than the "if" and "while" statement blocks. while These limitations make the language Limited in practice , It helps the compiler keep it compact and simple . pl/0 language is a subset of Pascal languageWith PascalScope rule (the inner layer can refer to an identifier enclosing it's outer definitio

$dfsoutputstream.nextblockoutputstream (dfsclient.java:2975) at org. apache.hadoop.hdfs.dfsclient$dfsoutputstream.access$2000 (dfsclient.java:2255) at Org.apache.hadoop.hdfs.dfsclient$dfsoutputstream$datastreamer.run (dfsclient.java:2446) 11/10/20 08:18:22 WARN HDFs . Dfsclient:error Recovery for blocks null bad datanode[0] nodes = = null 11/10/20, 08:18:22 WARN. Dfsclient:could not get block locations. Sou

A few days ago to see an algorithm topic, it looks very simple, that is, there is a rectangle composed of 0 and 1, and then find the rectangle of all elements are 1 of the largest rectangular rectangle, it seems quite simple at first, but I think half a day did not think out. Search on the Internet to find that the topic is quite famous, many people have written

Source: Watchstor.com anonymous name I want to comment (0) Abstract: RAID 0 + 1 is a combination of data block segments and disk images. When RAID 0 + 1 appears, the segmentation technology of the Oracle layer is eliminated, bec

First, the phenomenon 1. See if a process exists Ps-ef | Grep-v ' grep ' |grep-e ' Shell/cron/bonus/cash ' www 2624 1 0 Oct24? 00:00:35/usr/local/bin/php/data1/www/htdocs/hb.e.weibo.com/v2/www/htdocs/index.php--uri=shell/cron/bonus/cash- -get=proc_num=1proc_total=1--post= 2. View process creation time Ps-p 2624-o Lsta

JSJavaScript is not the same as C JAVA C # He doesn't have his own block-level scope, and of course you can simulate it in some way, as we'll talk about later.for (var i =0; iAssuming Java then the variable I will be destroyed immediately, but in JS it! Still existsquery identifiers in JSvar color = "Blue"; function GetColor () { //var volor = "Red"; return color;} Alert (GetColor ()) //blue//ass

if(px>Py) { theX[n]=0;98 About } - Else{101X[n]=1;102px=Pl;103wx=Wl;104 } the for(k=n-1;k>0;k--){106 Booleanflag=false;107 for(i=f[k-1];i){108 if(p[i]==pxw[i]==Wx) {109flag=true; the Break;111 } the }113 if(!flag) { theX[k]=

doesn't have his own block-level scope, and of course you can simulate it in some way, as we'll talk about later.for (var i =0; iIf it is Java then the variable I will be destroyed immediately, but in JS! Still existsquery identifiers in JSvar color = "Blue"; function GetColor () { //var volor = "Red"; return color;} Alert (GetColor ()) //blue//If you remove the comment from the GetColor () then

determine whether an optional type has a value, which is used in the IF whilevar str:string? = "Renhairui"If var tmp = str{println (TMP)}implicitly optional type any existing type behind add! Represents an optional typeDifference:Int! Accept int values and nilint can only accept int valuesint and Nil accepted but forced to parseFunction: Used to define variables that are not re-converted to nil after assignmentYou also need to determine if let temp = name {}type alias typealias typealias Counte

1 /*Summary of 0 and 12 recent exercises are always confusing 0 and 1 for the/and% operations when the results are counted3 so I tried it on the machine.4 Conclusion:5 C language, 0/any number is 06 0% Any number is 07

CPU privilege levels, the main difference between the two stacks is that the kernel stack of the task is small and the amount of data saved cannot exceed the 4096– task data structure block byte, about 3KB. The user-state stack of the task can be extended within the user's 64MB space. (1) Each task (except task 0 and Task 1