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Getting the first character of a string with $str[0]
... $string = md5(rand());
$position = rand(0, 31);
$start1 = microtime(true);
$char1 = $string[$position];
$end1 = microtime(true);
$time1[$i] = $end1 - $start1;
$start2 = microtime(true);
$char2 = substr($string, $position, 1);
$end2 = microtime(true);
$time2[$...
top命令使用详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...行是系统整体的统计信息。第一行是任务队列信息，同 uptime 命令的执行结果。其内容如下：
01:06:48
当前时间
up 17 days, 6:21
系统运行时间，格式为时:天数，小时:分钟
1 user
当前登录用户数
load avera...
C++实现一款简单完整的聊天室服务器+客户端 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
//MessageBuffer.cpp
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <pthread.h>
#include "MessageBuffer.h"
MessageBuffer::MessageBuffer() {
toStop = false;
pthread_mutex_init(&mutex,NULL);//初始化互斥量
pthread_cond_init(&condition,NULL);//初始化条件变...
Are tuples more efficient than lists in Python?
...tecode and just referenced when used, whereas lists need to be built at runtime.
– poolie
May 14 '13 at 22:32
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How do you calculate log base 2 in Java for integers?
...slightly faster than Integer.numberOfLeadingZeros() (20-30%) and almost 10 times faster (jdk 1.6 x64) than a Math.log() based implementation like this one:
private static final double log2div = 1.000000000001 / Math.log( 2 );
public static int log2fp0( int bits )
{
if( bits == 0 )
retur...
How do I get the current date in JavaScript?
...e new Date() to generate a new Date object containing the current date and time.
var today = new Date();
var dd = String(today.getDate()).padStart(2, '0');
var mm = String(today.getMonth() + 1).padStart(2, '0'); //January is 0!
var yyyy = today.getFullYear();
today = mm + '/' + dd + '/' +...
Python Progress Bar
...se a progress bar when my script is doing some task that is likely to take time?
33 Answers
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What is the best way to convert seconds into (Hour:Minutes:Seconds:Milliseconds) time?
...s the best way to convert seconds into (Hour:Minutes:Seconds:Milliseconds) time?
13 Answers
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Cleanest and most Pythonic way to get tomorrow's date?
...
datetime.date.today() + datetime.timedelta(days=1) should do the trick
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The shortest possible output from git log containing author and date
...ec36490 jesper Wed Nov 26 05:41:37 2008 +0000 Cleanup after [942]: Using timezon
ae62afd tobias Tue Nov 25 21:42:55 2008 +0000 Fixed #67 by adding time zone supp
164be7e mads Tue Nov 25 19:56:43 2008 +0000 fixed tests, and a 'unending appoi
93f1526 jesper Tue Nov 25 09:45:56 2008 +000...