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do { … } while (0) — what is it good for? [duplicate]
... available in C#, too, which doesn't have macros. I'm not sure why someone down-voted this reply but I see it as the almost-right answer, except it overlooked the explicit "0" in the while condition. Please, people, if you down-vote someone's reply please comment.
– Jon Davis
...
Why don't Java's +=, -=, *=, /= compound assignment operators require casting?
...2 is equivalent to E1 = (T)((E1) op (E2)), so that's kind of like implicit down typecasting (down from long to int). Whereas in i = i+j, we have to do it explicitly, ie, provide the (T) part in E1 = ((E1) op (E2)) Isn't it?
– bad_keypoints
Sep 22 '12 at 14:52
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Is there any way to prevent input type=“number” getting negative values?
...:
It was only preventing negative numbers from being entered from
up/down arrows, whereas user can type negative number from keyboard.
Solution is to prevent with key code:
// Select your input element.
var number = document.getElementById('number');
// Listen for input event on num...
Practical usage of setjmp and longjmp in C
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Error handling
Suppose there is an error deep down in a function nested in many other functions and error handling makes sense only in the top level function.
It would be very tedious and awkward if all the functions in between had to return normally and evaluate return...
How do I restrict a float value to only two places after the decimal point in C?
...ing works:
#include <math.h>
float val = 37.777779;
float rounded_down = floorf(val * 100) / 100; /* Result: 37.77 */
float nearest = roundf(val * 100) / 100; /* Result: 37.78 */
float rounded_up = ceilf(val * 100) / 100; /* Result: 37.78 */
Notice that there are three different r...
Why is Visual Studio 2013 very slow?
...using the Microsoft Git provider, which seems to slow Visual Studio 2013 down more and more the larger the repository gets.
I had the whole Dojo Toolkit framework under source control using the Microsoft Git provider, and it got to the point where there were delays from the time I hit a key to ...
The case against checked exceptions
... his work, this argument has always struck me as bogus. It basically boils down to:
"Checked exceptions are bad because programmers just abuse them by always catching them and dismissing them which leads to problems being hidden and ignored that would otherwise be presented to the user".
By ...
iOS 5 fixed positioning and virtual keyboard
...; can cause the focused input to be moved off-screen e.g. an input further down the page, or if an iPhone is in portrait. A better solution is on focus set the header.css({position:'absolute',top:window.pageYOffset+'px'}); and on blur set header.css({position:'fixed',top:0});.
–...
What is the most efficient way to deep clone an object in JavaScript?
... doesn't copy over undefined properties, etc., but this will also slow you down a little.
If you know the structure of the objects you are trying to clone or can avoid deep nested arrays you can write a simple for (var i in obj) loop to clone your object while checking hasOwnProperty and it will be...
Enum String Name from Value
...munication problem. Are you on a mobile device or maybe did you not scroll down far enough? There are two exact copies of your answer from 7 years back. I named the answerers, so they sho