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Circle line-segment collision detection algorithm?
... b = 2*f.Dot( d ) ;
float c = f.Dot( f ) - r*r ;
float discriminant = b*b-4*a*c;
if( discriminant < 0 )
{
// no intersection
}
else
{
// ray didn't totally miss sphere,
// so there is a solution to
// the equation.
discriminant = sqrt( discriminant );
// either solution may be on o...
What are the rules for evaluation order in Java?
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answered Jul 23 '11 at 15:34
Eric LippertEric Lippert
599k164164 gold badges11551155 silver badges20142014 bronze badges
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What is the $? (dollar question mark) variable in shell scripting? [duplicate]
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264
$? is used to find the return value of the last executed command.
Try the following in the shell...
VS Debug调试模式下内存泄露检测原理 - C/C++ - 清泛网 - 专注C/C++及内核技术
...中，内存块号也就是内存在第几次中分配，如下所示的{354}就是内存块号。
Detected memory leaks!
Dumping objects ->
d:\local\project\test.cpp(278) : {354} normal block at 0x003FDAB8, 44 bytes long.
Data: < P- P- > 80 00 E4 00 50 2D E5 00 50 2D E5 00 CD CD CD CD...
Why does this code using random strings print “hello world”?
....Random is constructed with a specific seed parameter (in this case -229985452 or -147909649), it follows the random number generation algorithm beginning with that seed value.
Every Random constructed with the same seed will generate the same pattern of numbers every time.
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Stopping python using ctrl+c
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edited Jan 21 '18 at 21:41
Chris Stratton
37.9k66 gold badges7676 silver badges113113 bronze badges
an...
Generate random numbers uniformly over an entire range
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154
Why rand is a bad idea
Most of the answers you got here make use of the rand function and the mo...
PHP中9大缓存技术总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...个php数组之类；
Ecmall商城系统里面就用了这种方式；
4、查询缓存
其实这跟数据缓存是一个思路，就是根据查询语句来缓存；将查询得到的数据缓存在一个文件中，下次遇到相同的查询时，就直接先从这个文件里面调数据，...
Rolling or sliding window iterator?
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124
There's one in an old version of the Python docs with itertools examples:
from itertools import...
How exactly does the callstack work?
... the return address.
2 Note that the registers that start with R are the 64-bit counterparts of the ones that start with E. EAX designates the four low-order bytes of RAX. I used the names of the 32-bit registers for clarity.
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