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What does default(object); do in C#?
... worth making it explicit)
The biggest use of default(T) is in generics, and things like the Try... pattern:
bool TryGetValue(out T value) {
if(NoDataIsAvailable) {
value = default(T); // because I have to set it to *something*
return false;
}
value = GetData();
re...
How to “log in” to a website using Python's Requests module?
...king. I'm new to this...so I can't figure out if I should make my Username and Password cookies or some type of HTTP authorization thing I found (??).
...
How to make a div 100% height of the browser window
I have a layout with two columns - a left div and a right div .
35 Answers
35
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位置传感器经纬度为0的问题 - 用户反馈 - 清泛IT社区，为创新赋能！
...丶:
想问下appinventor位置传感器调试一直是0,0是为什么
清泛:
[图片]
清泛:
看看是不是权限问题
Pursuer丶:
是这样的
Pursuer丶:
他刚进来的时候是好的 然后跳到第二个屏幕 再返回第一个 就变0,0了
Pursuer丶:
一开始初...
How do I break a string over multiple lines?
... edited May 30 '19 at 22:23
Alexander Mills
1
answered Sep 24 '10 at 19:54
Matt WilliamsonMatt Williamson
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Finding differences between elements of a list
... of numbers, how does one find differences between every ( i )-th elements and its ( i+1 )-th?
10 Answers
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Why is sed not recognizing \t as a tab?
...
Not all versions of sed understand \t. Just insert a literal tab instead (press Ctrl-V then Tab).
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fo...
How do I print the type of a variable in Rust?
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If you merely wish to find out the type of a variable and are willing to do it at compile time, you can cause an error and get the compiler to pick it up.
For example, set the variable to a type which doesn't work:
let mut my_number: () = 32.90;
// let () = x; would work too
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How to check if an object is nullable?
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There are two types of nullable - Nullable<T> and reference-type.
Jon has corrected me that it is hard to get type if boxed, but you can with generics:
- so how about below. This is actually testing type T, but using the obj parameter purely for generic type inference ...
How to round a number to significant figures in Python
... You should use log10(abs(x)), otherwise negative numbers will fail (And treat x == 0 separately of course)
– Tobias Kienzler
Jul 30 '13 at 8:06
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