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Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...double型，64bits，你不必担心Lua处理浮点数会慢（除非大于100,000,000,000,000），或是会有精度问题。你可以以如下的方式表示数字，0x开头的16进制和C是很像的。num = 1024
num = 3.0
num = 3.1416
num = 314.16e-2
num = 0.31416E1
num = 0xff
num = 0x56复制...
Rounding float in Ruby
...; "2.35"
If you want to store it rounded, you can use
>> (2.3465*100).round / 100.0
=> 2.35
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Hex transparency in colors [duplicate]
...le of percentages to hex values. E.g. for 50% white you'd use #80FFFFFF.
100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
65% — A6
60% — 99
55% — 8C
50% — 80
45% — 73
40% — 66
35% — 59
30% — 4D
25% — 40
20% — 33
15% — 26
10% — 1A
5% — 0D
0% ...
What is the most efficient string concatenation method in python?
...sion: C:\temp>python -mtimeit "''.join(chr(x) for x in xrange(65,91))" 100000 loops, best of 3: 9.71 usec per loop C:\temp>python -mtimeit "''.join([chr(x) for x in xrange(65,91)])" 100000 loops, best of 3: 7.1 usec per loop
– hughdbrown
Aug 30 '09 at 5...
How can I add a box-shadow on one side of an element?
... the box-shadow rule:
.myDiv
{
border: 1px solid #333;
width: 100px;
height: 100px;
box-shadow: 10px 0 5px -2px #888;
}
<div class="myDiv"></div>
The fourth property there -2px is the shadow spread, you can use it to change the spread of the shadow, making it ...
How to insert a character in a string at a certain position?
...
int yourInteger = 123450;
String s = String.format("%6.2f", yourInteger / 100.0);
System.out.println(s);
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Precise Financial Calculation in JavaScript. What Are the Gotchas?
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You should probably scale your decimal values by 100, and represent all the monetary values in whole cents. This is to avoid problems with floating-point logic and arithmetic. There is no decimal data type in JavaScript - the only numeric data type is floating-point. Theref...
How to make an Android device vibrate?
...ervice(Context.VIBRATOR_SERVICE);
// Start without a delay
// Vibrate for 100 milliseconds
// Sleep for 1000 milliseconds
long[] pattern = {0, 100, 1000};
// The '0' here means to repeat indefinitely
// '0' is actually the index at which the pattern keeps repeating from (the start)
// To repeat th...
How to initialize const member variable in a class?
When I am trying to initialize the const member variable t with 100. But it's giving me the following error:
11 Answers
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How to round float numbers in javascript?
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This doesn't always work. Take Math.round(1.005*100)/100 for example from MDN
– tybro0103
May 3 '16 at 17:54
7
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