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App Inventor 2 数学代码块 · App Inventor 2 中文网
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大于 ( > )
大于等于 ( ≥ )
小于 ( < )
小于等于 ( ≤ )
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乘 ( * )
除 ( / )
幂运算 ( ^ )
随机整数 (rando...
Is there a performance gain in using single quotes vs double quotes in ruby?
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$ ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.0.0]
$ cat benchmark_quotes.rb
# As of Ruby 1.9 Benchmark must be required
require 'benchmark'
n = 1000000
Benchmark.bm(15) do |x|
x.report("assign single") { n.times do; c =...
Can a class member function template be virtual?
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answered Mar 1 '10 at 8:52
sbisbi
198k4444 gold badges232232 silver badges423423 bronze badges
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Change Active Menu Item on Page Scroll?
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207
It's done by binding to the scroll event of the container (usually window).
Quick example:
//...
Undefined method 'task' using Rake 0.9.0
I just updated Rake to the latest version ( 0.9.0.beta.4 ) and the rake command ends up with the following error message:
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Is there a standard sign function (signum, sgn) in C/C++?
...+ version yet:
template &lt;typename T&gt; int sgn(T val) {
return (T(0) &lt; val) - (val &lt; T(0));
}
Benefits:
Actually implements signum (-1, 0, or 1). Implementations here using copysign only return -1 or 1, which is not signum. Also, some implementations here are returning a float (or...
javascript: recursive anonymous function?
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answered Oct 7 '10 at 16:46
PointyPointy
359k5454 gold badges508508 silver badges567567 bronze badges
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Is there a better way of writing v = (v == 0 ? 1 : 0); [closed]
I want to toggle a variable between 0 and 1. If it's 0 I want to set it to 1, else if it's 1 I want to set it to 0.
31 Answ...
Gray out image with CSS?
...age" src="something.jpg" /&gt;
&lt;/div&gt;
css:
#myImage {
opacity: 0.4;
filter: alpha(opacity=40); /* msie */
}
/* or */
#wrapper {
opacity: 0.4;
filter: alpha(opacity=40); /* msie */
background-color: #000;
}
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Memoization in Haskell?
...efficiently the following function in Haskell, for large numbers (n &gt; 108)
8 Answers
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