大约有 15,000 项符合查询结果（耗时：0.0244秒） [XML]
Undefined reference to `sin` [duplicate]
...y. As a result, you can compile your .o object files, but not build your executable.
As Paul has already mentioned add "-lm" to link with the math library in the step where you are attempting to generate your executable.
In the comment, linuxD asks:
Why for sin() in <math.h>, do we need...
How to undo a git pull?
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Or to make it more explicit than the other answer:
git pull
whoops?
git reset --keep HEAD@{1}
Versions of git older than 1.7.1 do not have --keep. If you use such version, you could use --hard - but that is a dangerous operation because i...
Centering a view in its superview using Visual Format Language
...wever, not that difficult to do it using a single VFL string and a single extra constraint (per axis):
VFL: "|-(>=20)-[view]-(>=20)-|"
[NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRe...
How to add leading zeros for for-loop in shell? [duplicate]
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Use the following syntax:
$ for i in {01..05}; do echo "$i"; done
01
02
03
04
05
Disclaimer: Leading zeros only work in >=bash-4.
If you want to use printf, nothing prevents you from putting its result in a variable for further use:
$ foo=$(pri...
Convert line-endings for whole directory tree (Git)
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dos2unix does that for you. Fairly straight forward process.
dos2unix filename
Thanks to toolbear, here is a one-liner that recursively replaces line endings and properly handles whitespace, quotes, and shell meta chars.
find . -...
gcc makefile error: “No rule to make target …”
I'm trying to use GCC (linux) with a makefile to compile my project.
17 Answers
17
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A potentially dangerous Request.Path value was detected from the client (*)
I am receiving the rather self explanatory error:
8 Answers
8
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What does the NS prefix mean?
Many classes in Cocoa/Cocoa Touch have the NS prefix. What does it mean?
9 Answers
9
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How to obtain a Thread id in Python?
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Also note that at least in Python 2.5 and 2.6 on OS X, there seems to be a bug where threading.current_thread().ident is inappropriately None. Probably makes sense just to use thread.get_ident() in Python 2 and threading.current_thread().ident in Python 3.
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Making the main scrollbar always visible
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I think Internet Explorer 6.x+, Firefox 1.5+ if I remember correctly. I've been using the above code and it works in FF1.5-3.5.1 and IE6-8 for me.
– Corv1nus
Jul 29 '09 at 19:43
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