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SQL SELECT speed int vs varchar
...upy between 2 and 8 bytes, with 4 being usually more than enough ( -2147483648 to +2147483647 )
character types occupy 4 bytes plus the actual strings.
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Go > operators
... 4
1 << 3 = 8
1 << 4 = 16
1 << 5 = 32
1 << 6 = 64
1 << 7 = 128
1 << 8 = 256
1 << 9 = 512
512 >> 1 = 256
512 >> 2 = 128
512 >> 3 = 64
512 >> 4 = 32
512 >> 5 = 16
512 >> 6 = 8
512 >> 7 = 4
512 >> ...
Fundamental difference between Hashing and Encryption algorithms
...change it to a new one and use that as feedback into itself (MD5 does this 64 times for each 512bit chunk of data). It then somehow combines the resultant states from all these iterations back together to form the resultant hash.
Now, if you wanted to decode the hash, you'd first need to figure ou...
How to deal with floating point number precision in JavaScript?
...egers up to the length of the significand, and as per ECMA standard it's a 64bit float. So it can exactly represent integers up to 2^52
– Michael Borgwardt
Jul 25 '12 at 13:15
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clang error: unknown argument: '-mno-fused-madd' (python package installation failure)
.../2.7/include/python2.7 -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTR...
What is the maximum length of data I can put in a BLOB column in MySQL?
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A BLOB can be 65535 bytes (64 KB) maximum.
If you need more consider using:
a MEDIUMBLOB for 16777215 bytes (16 MB)
a LONGBLOB for 4294967295 bytes (4 GB).
See Storage Requirements for String Types for more info.
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Efficient way to determine number of digits in an integer
... count the number of electrons in the Universe (10^78 last time I did it), 64 bits will do pretty well. 32 bit machines lasted ~~15 years. I'd guess 64 bit machines will last a lot longer. For larger number, multiprecision arithmetic will be fine, and I doubt if efficiency of computing digit coun...
How do I remedy “The breakpoint will not currently be hit. No symbols have been loaded for this docu
...eakpoints multiple projects in a solution - some compiled as x86, some as x64.
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console.log timestamps in Chrome?
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70.0.3538.110 (Official Build) (64-bit) This answer once worked for me: i.e. console "gear icon"; "Show timestamps" checkmark ... but now I don't see "Show timestamps" in Chrome 70.0.3538.110 (Official Build) (64-bit) So I tried @tekiegirl's suggestion r...
Is there a better Windows Console Window? [closed]
...ws 7 Jump lists and Progress on taskbar
Integration with DosBox (useful in 64bit systems to run DOS applications)
Smooth resize, maximized and fullscreen window modes
Scrollbar initially hidden, may be revealed by mouseover or checkbox in settings
Optional settings (e.g. pallette) for selected appli...