大约有 46,000 项符合查询结果（耗时：0.0319秒） [XML]
What is “:-!!” in C code?
... in effect, a way to check whether the expression e can be evaluated to be 0, and if not, to fail the build.
The macro is somewhat misnamed; it should be something more like BUILD_BUG_OR_ZERO, rather than ...ON_ZERO. (There have been occasional discussions about whether this is a confusing name.)
...
Why is isNaN(null) == false in JS?
...false.
So in the specific case x = null, null is converted to the number 0, (try evaluating Number(null) and see that it returns 0,) and isNaN(0) returns false. A string that is only digits can be converted to a number and isNaN also returns false. A string (e.g. 'abcd') that cannot be converted t...
How to swap two variables in JavaScript
...swap the values of two variables.
Given variables a and b:
b = [a, a = b][0];
Demonstration below:
var a=1,
b=2,
output=document.getElementById('output');
output.innerHTML="<p>Original: "+a+", "+b+"</p>";
b = [a, a = b][0];
output.innerHTML+="<p>Swapped: ...
Version number comparison in Python
... cmp -like function which compares two version numbers and returns -1 , 0 , or 1 based on their compared valuses.
17 A...
How to convert Nonetype to int or string?
...
10 Answers
10
Active
...
How can I create a two dimensional array in JavaScript?
...
50 Answers
50
Active
...
Circle line-segment collision detection algorithm?
...
206
Taking
E is the starting point of the ray,
L is the end point of the ray,
C is the cente...
How do I use a Boolean in Python?
...
Transcendence
2,07622 gold badges1818 silver badges3030 bronze badges
answered Nov 17 '09 at 12:51
Bastien LéonardBa...
adding noise to a signal in python
I want to add some random noise to some 100 bin signal that I am simulating in Python - to make it more realistic.
7 Answer...
How to create a drop shadow only on one side of an element?
...ent is required.
#box {
background-color: #3D6AA2;
width: 160px;
height: 90px;
position: absolute;
top: calc(10% - 10px);
left: calc(50% - 80px);
}
.box-shadow:after {
content:"";
position:absolute;
width:100%;
bottom:1px;
z-index:-1;
...