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I have this string: string input = "1,2,3,4,s,6"; Pay attention to the s character. I just want to convert this string in a List<int> using LINQ. I initially tried in this way: var myList = new List<int>(); input.Split(',').ToList().ForEach(n => myList.Add(int.TryParse(n, out int num) ? num : -1) ); lista.RemoveAll(e => e == -1); But I prefer not have any -1 instead of a no-number characters. So now I try with this: var myList = new List<int>(); input.Split(',').ToList() .FindAll(n => int.TryParse(n, out int _)) .ForEach(num => myList.Add(int.Parse(num))); I prefer this, but is really a shame

If I create a stored procedure in MySQL with an OUT or INOUT parameter, it does not work. Even if I leave the stored procedure empty. The DDL is as follows: CREATE DEFINER=`root`@`localhost` PROCEDURE `testing_inout`(`a` int,INOUT `b` int) BEGIN END The first parameter is a regular IN parameter. The second one is an INOUT paremeter (even if set as OUT the same problem persists) When I call this stored procedure, I get an error stating: OUT or INOUT argument 2 for routine db_name.testing_inout is not a variable or NEW pseudo-variable in BEFORE trigger. This error persists even if code is

I've got a menu activity and a game activity which is launched from the menu. Some (most) of the times I launch the game activity; all input hangs for a few (up to 10-ish) seconds and then plays out in hyperspeed while i get this in logcat: 11-20 18:24:27.873: WARN/WindowManager(2473): Key dispatching timed out sending to southgrove.game/southgrove.game.Game 11-20 18:24:27.873: WARN/WindowManager(2473): Previous dispatch state: {{KeyEvent{action=1 code=4 repeat=0 meta=0 scancode=28 mFlags=8} to Window{4866c7a0 southgrove.game/southgrove.game.Game paused=false} @ 1290273811209 lw=Window

void swap(int &first, int &second){ int temp = first; first = second; second = temp; } ////// int a=3,b=2; swap(a,b); In the above example, the C compiler complaints that "void swap(int &first, int &second)" has a syntax error like missing "&" before "( / {". I don't understand why? Doesn't C support this feature? C doesn't support passing by reference. So you will need to use pointers to do what you are trying to achieve: void swap(int *first, int *second){ int temp = *first; *first = *second; *second = temp; } int a=3,b=2; swap(&a,&b); I do NOT recommend this: But I'll add it for

I'm having the following static C# method public static bool TryParse (string s, out double result) which I would like to call from Python using the Python NET package. import clr from System import Double r0 = Double.IsNaN(12.3) # works r1, d1 = Double.TryParse("12.3") # fails! TypeError: No method matches given arguments. This works in IronPython. d2 = 0.0 r2, d2 = Double.TryParse("12.3", d2) # fails! TypeError: No method matches given arguments Any idea? Update I found the following answer, see https://stackoverflow.com/a/19600349/7556646 . CPython using PythonNet does basically the same