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Why prefer two's complement over sign-and-magnitude for signed numbers?
...nd just make the most significant term negative.
Taking an 8-bit value a7 a6 a5 a4 a3 a2 a1 a0
The usual unsigned binary interpretation is:
27*a7 + 26*a6 + 25*a5 + 24*a4 + 23*a3 + 22*a2 + 21*a1 + 20*a0
11111111 = 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 = 255
The two's complement interpretation is:
-27...
How can I do time/hours arithmetic in Google Spreadsheet?
...e formula.
For example:
B3 = 10:45
C3 = 20 (minutes)
D3 = 15 (minutes)
E3 = 8 (hours)
F3 = B3+time(E3,C3+D3,0) equals 19:20
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SQL - Update multiple records in one query
...
(3, 'a3', 'b3', 'c3'),
(4, 'a4', 'b4', 'c4'),
(5, 'a5', 'b5', 'c5'),
(6, 'a6', 'b6', 'c6')
ON DUPLICATE KEY UPDATE id=VALUES(id),
a=VALUES(a),
b=VALUES(b),
c=VALUES(c);
This insert new values into table, but if primary key is duplicated (already inserted into table) that values you specify would ...
What is the significance of ProjectTypeGuids tag in the visual studio project file
... {F85E285D-A4E0-4152-9332-AB1D724D3325}
ASP.NET MVC 4 {E3E379DF-F4C6-4180-9B81-6769533ABE47}
Test {3AC096D0-A1C2-E12C-1390-A8335801FDAB}
Solution Folder {2150E333-8FDC-42A3-9474-1A3956D46DE8}
...
The apk must be signed with the same certificates as the previous version
...7:45:0F:B4:C7:FC:76:43:90:04:DC:A7:84:EF:33:E9
SHA256: FB:6C:59:9E:B4:58:E3:62:AD:81:42:...:09:FC:BC:FE:E7:40:53:C3:D8:14:4F
Signature algorithm name: SHA256withRSA
Version: 3
The important parts to note here — for each APK — are the SHA1 fingerprint value, the Owner identi...
How to unescape HTML character entities in Java?
... {"\u00E2", "acirc"}, // в - lowercase a, circumflex accent
{"\u00E3", "atilde"}, // г - lowercase a, tilde
{"\u00E4", "auml"}, // д - lowercase a, umlaut
{"\u00E5", "aring"}, // е - lowercase a, ring
{"\u00E6", "aelig"}, // ж - lowercase ae
{"\u00E7", "c...
Undo git pull, how to bring repos to old state
...it will delete the newly created files and folders.
git reset --hard 9573e3e0
Where 9573e3e0 is your {Commit id}
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How does this milw0rm heap spraying exploit work?
... pop edx
0000000F F4 hlt
00000010 EA8331FC0B6A6A jmp 0x6a6a:0xbfc3183
00000017 03D4 add edx,esp
00000019 07 pop es
0000001A 67305CFF xor [si-0x1],bl
0000001E 98 cwde
0000001F BBD7FFA4FE mov ebx,0xfea4ffd...
techniques for obscuring sensitive strings in C++
...rsecretpasswordthatyouwillneverguess";
wchar_t myKey[48];
myKey[21] = 0x00A6;
myKey[10] = 0x00B0;
myKey[29] = 0x00A1;
myKey[22] = 0x00A2;
myKey[19] = 0x00B4;
myKey[33] = 0x00A2;
myKey[0] = 0x00B8;
myKey[32] = 0x00A0;
myKey[16] = 0x00B0;
myKey[40] = 0x00B0;
myKey[4] = 0x00A5;
myKey[26] = 0x00A1;
myK...
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