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Count the number of occurrences of a string in a VARCHAR field?
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The ROUND here is unnecessary. assume a string of length x with n occurrences of'value. LENGTH(description) - LENGTH( REPLACE ( description, "value", "") ) will always give you n*length("value"), diving that by length of value will always leave a whole number n. N...
What resources are shared between threads?
...gment from the DATA segment. Sometimes there is RODATA (Data like constant strings that can be in pages marked Read Only). Some systems even break DATA into SMALL DATA (accessible from a base + 16-bit offset) and (FAR) DATA (32-bit offset required to access). It's also possible that there is an extr...
Why does this code using random strings print “hello world”?
...e share your code. I would greatly appreciate it.
public static void main(String[] args) {
long time = System.currentTimeMillis();
generate("stack");
generate("over");
generate("flow");
generate("rulez");
System.out.println("Took " + (System.currentTimeMillis() - time) + " ...
Git SSH error: “Connect to host: Bad file number”
... PORT STATE SERVICE
22/tcp ***filtered*** ssh
Nmap done: 1 IP address (1 host up) scanned in 2.63 seconds
As you can see the state is Filtered, which means something is blocking it.
You can solve this by performing an SSH to port 443 (your firewall / isp will not block this).
It is...
Find and extract a number from a string
I have a requirement to find and extract a number contained within a string.
29 Answers
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Is std::vector so much slower than plain arrays?
...peline stages per array accesses. So the vector looks like it is using one extra instruction per accesses.
– Martin York
Sep 8 '10 at 3:25
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What does the explicit keyword mean?
...cidental construction that can hide bugs.
Contrived example:
You have a MyString(int size) class with a constructor that constructs a string of the given size. You have a function print(const MyString&), and you call print(3) (when you actually intended to call print("3")). You expect it to p...
snprintf and Visual Studio 2010
...tes at most buf_size - 1 characters to a buffer. The resulting
character string will be terminated with a null character, unless
buf_size is zero. If buf_size is zero, nothing is written and
buffer may be a null pointer. The return value is the number of
characters that would have been writt...
Avoid trailing zeroes in printf()
...01357
breaks it.
What you can do is to sprintf("%.20g") the number to a string buffer then manipulate the string to only have N characters past the decimal point.
Assuming your number is in the variable num, the following function will remove all but the first N decimals, then strip off the trai...
Find all storage devices attached to a Linux machine [closed]
...2.6.17 and up):
#! /bin/bash
hal-find-by-property --key volume.fsusage --string filesystem |
while read udi ; do
# ignore optical discs
if [[ "$(hal-get-property --udi $udi --key volume.is_disc)" == "false" ]]; then
dev=$(hal-get-property --udi $udi --key block.device)
f...