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Why are #ifndef and #define used in C++ header files?

...s opened by the form to manipulate. It gaveme lots of errors and I didn't know what to do. I gave up =) – user142019 Oct 31 '09 at 10:58 6 ...
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A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7

... purchase (again, RMStore helps you with this). Verification at a glance Now we got all the fields from the receipt and all its in-app purchases. First we verify the receipt itself, and then we simply check if the receipt contains the product of the transaction. Below is the method that we called...
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PHP mkdir: Permission denied problem

... I know this is an old thread, but it needs a better answer. You shouldn't need to set the permissions to 777, that is a security problem as it gives read and write access to the world. It may be that your apache user does not ha...
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Get User's Current Location / Coordinates

... Step by step answer. But please update it. Its not working for now. – Dheeraj D Oct 13 '17 at 5:16 add a comment  |  ...
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Import a file from a subdirectory?

... community has produced the PSR-4 standard and Composer implements it, and nowadays nobody has to worry about that. And no stupid hardcoded __init__ files (but if you want it, just register an autoloading hook ! This is the difference between hacky and hackable). – Morgan Touve...
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How to check an Android device is HDPI screen or MDPI screen?

... The below answer is now the above answer, need to be more generic ;) – Neil Oct 3 '12 at 11:58 ...
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How is a CRC32 checksum calculated?

... x^5 + x^4 + 3*x^3 + x^2 + x^1 + x^0 (or that original number we had) I know this is a leap of faith but this is beyond my capability as a line-programmer. If you are a hard-core CS-student or engineer I challenge to break this down. Everyone will benefit from this analysis. So to work out a full...
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clear javascript console in Google Chrome

... Update: As of November 6, 2012, console.clear() is now available in Chrome Canary. If you type clear() into the console it clears it. I don't think there is a way to programmatically do it, as it could be misused. (console is cleared by some web page, end user can't acce...
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Sort Go map values by keys

... Ah, okay. Thank you for teaching me. Now, it is printing all even then all odd. play.golang.org/p/K2y3m4Zzqd How can I get it to alternate so that it is in order? – gramme.ninja Apr 28 '14 at 2:20 ...
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Using braces with dynamic variable names in PHP

...me in some cases. In PHP7, dynamic variables, properties, and methods will now be evaluated strictly in left-to-right order, as opposed to the mix of special cases in PHP5. The examples below show how the order of evaluation has changed. Case 1 : $$foo['bar']['baz'] PHP5 interpetation : ${$foo['bar...