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Swift - How to convert String to Double

I'm trying to write a BMI program in swift language. And I got this problem: how to convert a String to a Double? 29 Answer...
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Change type of varchar field to integer: “cannot be cast automatically to type integer”

I have a small table and a certain field contains the type " character varying ". I'm trying to change it to " Integer " but it gives an error that casting is not possible. ...
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How to delete a whole folder and content?

...tion to be able to delete the DCIM folder (which is located on the SD card and contains subfolders). 23 Answers ...
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Function to clear the console in R and RStudio

I am wondering if there is a function to clear the console in R and, in particular, RStudio I am looking for a function that I can type into the console, and not a keyboard shortcut. ...
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String output: format or concat in C#?

... what I'm trying to measure. 2. I'm starting the Stopwatch before the loop and stopping it right after, this way I'm not losing precision if the function takes for example 26.4 ticks to execute. 3. The way you divided the result by some iterations was wrong. See what happens if you have 1000 millis...
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How to get screen dimensions as pixels in Android

I created some custom elements, and I want to programmatically place them to the upper right corner ( n pixels from the top edge and m pixels from the right edge). Therefore I need to get the screen width and screen height and then set position: ...
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Android Studio: Add jar as library?

I'm trying to use the new Android Studio but I can't seem to get it working correctly. 34 Answers ...
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How can I create a “Please Wait, Loading…” animation using jQuery?

...relation to the viewport window with position:fixed. Width, height, top and left speak for themselves. Background we set to 80% white with our animation centered, and no-repeating */ .modal { display: none; position: fixed; z-index: 1000; top: 0; left: ...
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How to test a merge without actually merging first

... simulating a git merge between two branches, the current working branch and the master, but without making any changes? ...
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How do I add files and folders into GitHub repos?

I created an account on GitHub — I'm new on it — and I'm facing a problem with adding files. I have added readme.txt . Also, I have 3 other PHP files and a folder including images. ...