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Default implementation for Object.GetHashCode()
...h of {2,2}
etc - which can be common if just using an unweighted sum, or xor (^), etc.
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Update a table using JOIN in SQL Server?
...Table2 AS t2
ON t1.CommonField = t2.[Common Field]
WHERE t1.BatchNo = '110';
If you're doing something really silly - like constantly trying to set the value of one column to the aggregate of another column (which violates the principle of avoiding storing redundant data), you can use a CTE (c...
Getting visitors country from their IP
...any IP address. [Support IPV4 & IPV6]
<?php
echo ip_info("173.252.110.27", "Country"); // United States
echo ip_info("173.252.110.27", "Country Code"); // US
echo ip_info("173.252.110.27", "State"); // California
echo ip_info("173.252.110.27", "City"); // Menlo Park
echo ip_info("173.252.11...
Fast stable sorting algorithm implementation in javascript
... 70, weight: 95 },
{ height: 100, weight: 100 },
{ height: 80, weight: 110 },
{ height: 110, weight: 115 },
{ height: 100, weight: 120 },
{ height: 70, weight: 125 },
{ height: 70, weight: 130 },
{ height: 100, weight: 135 },
{ height: 75, weight: 140 },
{ height: 70, weight: 140 }...
Using the field of an object as a generic Dictionary key
...You might want to start with the Equals-Method and then (in GetHashCode()) xor the hash code of every member you compare in Equals.
public class Foo {
public string A;
public string B;
override bool Equals(object other) {
var otherFoo = other as Foo;
if (otherFo...
解决：mfcs110ud.lib(dllmodul.obj) : error LNK2005: _DllMain@12 已经在 ...
原因分析：
_USRDLL定义有的话，MFC会自动生成一个DllMain入口函数，
这时在dll源码中额外又添加了一个DllMain入口函数，就会出现重定义冲突。
Check if at least two out of three booleans are true
...
Just for the sake of using XOR to answer a relatively straight-forward problem...
return a ^ b ? c : a
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Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
...id2 = c("Maz", "Maz", "Dat", "Hor", "Dus", "Mer"),
hp = c(110, 110, 181, 110, 245, 62),
cyl = c(6, 6, 4, 6, 8, 4),
qsec = c(16.46, 17.02, 33.00, 19.44, 15.84, 20.00))
df2 = data.frame(id1 = c("Mazda RX4", "Mazda RX4 Wag", "Datsun 710",
...
How many characters can UTF-8 encode?
...ning 6 bits are for the value.
So a four byte sequence would begin with 11110... (and ... = three bits for the value) then three bytes with 6 bits each for the value, yielding a 21 bit value. 2^21 exceeds the number of unicode characters, so all of unicode can be expressed in UTF8.
...
Filter rows which contain a certain string
... disp hp drat wt qsec vs am gear carb type
1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 Mazda RX4
2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 Mazda RX4 Wag
3 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 Toyota Corolla
4 21.5 4 120.1 97 3.70 2.465 20....