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分段机制、分页机制到底是什么？ - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
分段机制、分页机制到底是什么？简单地说：线性地址- （分页）-> 逻辑地址- （分段） -> 物理地址两者都是寻址的一种间接方式，我们应用层只关心线性地址（看起来连续...简单地说：
线性地址 - （分页）-> 逻辑地址 - （...
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Code Golf - π day
... area="{@area}"/>
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<xsl:apply-templates select="msxsl:node-set($next)"/>
</xsl:template>
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<xsl:template match="s[@x &gt; @R]">
<xsl:variable name="next">
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&l...
Why is there no logical xor in JavaScript?
Why is there no logical xor in JavaScript?
19 Answers
19
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jQuery OR Selector?
I am wondering if there is a way to have "OR" logic in jQuery selectors. For example, I know an element is either a descendant of an element with class classA or classB, and I want to do something like elem.parents('.classA or .classB') . Does jQuery provide such functionality?
...
Why is XOR the default way to combine hashes?
...nt to combine them. I've read that a good way to combine two hashes is to XOR them, e.g. XOR( H(A), H(B) ) .
9 Answers
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Swapping two variable value without using third variable
...
Using the xor swap algorithm
void xorSwap (int* x, int* y) {
if (x != y) { //ensure that memory locations are different
*x ^= *y;
*y ^= *x;
*x ^= *y;
}
}
Why the test?
The test is to ensure that x an...
Swapping column values in MySQL
...rows affected (0.08 sec)
Records: 4 Duplicates: 0 Warnings: 0
mysql> SELECT * FROM swaptest;
+------+------+
| X | Y |
+------+------+
| 1 | 2 |
| 3 | 4 |
| -5 | -8 |
| -13 | 27 |
+------+------+
4 rows in set (0.00 sec)
mysql>
Here is the swap being performed
m...
Find XOR of all numbers in a given range
... typically between 1 and 4,000,000,000 inclusive. You have to find out the XOR of all the numbers in the given range.
5 Ans...
What does (x ^ 0x1) != 0 mean?
...
The XOR operation (x ^ 0x1) inverts bit 0. So the expression effectively means: if bit 0 of x is 0, or any other bit of x is 1, then the expression is true.
Conversely the expression is false if x == 1.
So the test is the same ...