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How to get image height and width using java?
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From all I'm reading, this reads the entire image into memory. Which is extreme just to get width and height.
– Marc
May 17 '15 at 20:07
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How to find duplicates in 2 columns not 1
I have a MySQL database table with two columns that interest me. Individually they can each have duplicates, but they should never have a duplicate of BOTH of them having the same value.
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What's the difference between a web site and a web application? [closed]
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This is totally personal and subjective, but I'd say that a website is defined by its content, while a web application is defined by its interaction with the user. That is, a website can plausibly consist of a static content repository ...
Format bytes to kilobytes, megabytes, gigabytes
... return round($bytes, $precision) . ' ' . $units[$pow];
}
(Taken from php.net, there are many other examples there, but I like this one best :-)
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How to escape double quotes in a title attribute
...te (for javascript to produce editable textarea): data-editable-note="<?php echo str_replace('"', '&quot;', $note); ?>"><?php echo mark::up($note); ?></div>
– WEBjuju
Sep 23 '19 at 13:05
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What does the line “#!/bin/sh” mean in a UNIX shell script?
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It's called a shebang, and tells the parent shell which interpreter should be used to execute the script.
e.g.
#!/usr/bin/perl <--perl script'
#!/usr/bin/php <-- php script
#!/bin/false <--- do-nothing script, because ...
“hello, world” 起源及其他 - 创意 - 清泛网 - 专注C/C++及内核技术
...章（我的hello world）、环境搭建成功后的第一个测试…
问题的提出
相传古时候有个退休的程序员，在家闲来无事，决定修习书法之道。第一日，备好笔墨纸砚，便挥毫写下一行大字：“hello, world”。
学过编程语言的人都笑了...
c/c++ volatile和mutable关键字 - C/C++ - 清泛网 - 专注C/C++及内核技术
...automatic variables)
3) 多线程应用中被几个任务共享的变量
问题：
1)一个参数既可以是const还可以是volatile吗？解释为什么。
2); 一个指针可以是volatile 吗？解释为什么。
3); 下面的函数有什么错误：
int square(volatile int *ptr)
{
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WhatsApp比微信好在哪里？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...免费”，而“增值服务”收费，但是这种商业模式带来的问题是，一个越来越庞大臃肿的应用，一个越来越脱离其核心功能的应用。
总结
可见，WhatsApp成功的一大因素就是“专注”，坚持其工具属性，因为是付费应用，因此就...
Mac OS X Git安装教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...不是很熟悉命令行，可以使用之前的方法安装。如果没有问题，开始吧。
下载并解压 Git 源代码：
$ curl -O http://kernel.org/pub/software/scm/git/git-1.7.5.tar.bz2
$ tar xzvf git-1.7.5
打开目录，编译 Git：
$ cd git-1.7.5
$ ./configure --...