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CSS to set A4 paper size

I need simulate an A4 paper in web and allow to print this page as it is show on browser (Chrome, specifically). I set the element size to 21cm x 29.7cm, but when I send to print (or print preview) it clip my page. ...
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How do I step out of a loop with Ruby Pry?

...y with my Rails application. I set binding.pry inside a loop in my model to try and debug a problem. For example: 9 Answe...
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Simple way to calculate median with MySQL

What's the simplest (and hopefully not too slow) way to calculate the median with MySQL? I've used AVG(x) for finding the mean, but I'm having a hard time finding a simple way of calculating the median. For now, I'm returning all the rows to PHP, doing a sort, and then picking the middle row, but ...
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Why is it OK to return a 'vector' from a function?

...s code. I have seen this type of code several times. words is a local vector. How is it possible to return it from a function? ...
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What exactly does stringstream do?

I am trying to learn C++ since yesterday and I am using this document: http://www.cplusplus.com/files/tutorial.pdf (page 32) . I found a code in the document and I ran it. I tried inputting Rs 5.5 for price and an integer for quantity and the output was 0. I tried inputting 5.5 and 6 and the output...
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TextView.setTextSize behaves abnormally - How to set text size of textview dynamically for different

...lling TextView.setTextSize() is working abnormally. Right after the call to setTextSize if we get a getTextSize its returning a much higher value that what we set it to earlier. ...
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Add disabled attribute to input element using Javascript

I have an input box and I want it to be disabled and at the same time hide it to avoid problems when porting my form. 7 Ans...
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How to put a line comment for a multi-line command [duplicate]

I know how to write a multi-line command in a Bash script, but how can I add a comment for each line in a multiline command? ...
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How to grey out a button?

I have a button defined as shown below. When I want to disable it I use my_btn.setEnabled(false) , but I would also like to grey it out. How can I do that? ...
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Delete directories recursively in Java

Is there a way to delete entire directories recursively in Java? 26 Answers 26 ...