work

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Why do you require ampersand (&) in the scanf function. What will the output or type of error (compile or runtime) be in the following C code? #include void main () { int a ; printf ( "enter integer:" ); scanf ( "%d" , a ); } 回答1: The & in C is an operator that returns the address of the operand. Think of it this way, if you would simply give scanf the variable a without the & , it will be passed to it by-value, which means scanf will not be able to set its value for you to see. Passing it by-reference (using & actually passes a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have this input code in my form: I change the oninvalid message with this javascritp code: Here is the problem, if I clicked on submit and the field is empty, the field shome the error so I need to fill the field, but after fill the field, I still getting the warning even the fill is not empty. What I'm doing wrong??? 回答1: You can set a custom validity message with setCustomValidity , however any non-blank string will cause the field to act as if it had an invalid value. You need to setCustomValidity('') to clear the invalidated state of

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm using mac os x and trying to setup pycallgraph. Ive installed pycallgraph with pip and graphviz with homebrew. Everything works from shell. But not from pycharm. from pycallgraph import PyCallGraph from pycallgraph import Config from pycallgraph import GlobbingFilter from pycallgraph.output import GraphvizOutput config = Config() config.trace_filter = GlobbingFilter(exclude=[ 'pycallgraph.*', ]) graphviz = GraphvizOutput(output_file='filter_exclude.png') with PyCallGraph(output=graphviz, config=config): def my_fun(): print "HELLO" my_fun

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a strange problem, with matplotlib. If I run this program, I'm able to open and close several time the same figure. import numpy from pylab import figure, show X = numpy.random.rand(100, 1000) xs = numpy.mean(X, axis=1) ys = numpy.std(X, axis=1) fig = figure() ax = fig.add_subplot(111) ax.set_title('click on point to plot time series') line, = ax.plot(xs, ys, 'o', picker=5) # 5 points tolerance def onpick(event): figi = figure() ax = figi.add_subplot(111) ax.plot([1,2,3,4]) figi.show() fig.canvas.mpl_connect('pick_event', onpick) show

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want my Java program to use the system's proxy configuration. Accordingly, I used the code found in many places, such as this answer , to set java.net.useSystemProxies to true and call ProxySelector.getDefault().select(...) to discover the proxy for the particular host I want to reach. This works fine when I've configured a single explicit proxy server in Internet Properties. But if I have set "Use automatic configuration script", it always returns the DIRECT "proxy". I know that the script works, as my browser can access the hosts for

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Microsoft announced the Visual Studio Async CTP today (October 28, 2010) that introduces the async and await keywords into C#/VB for asynchronous method execution. First I thought that the compiler translates the keywords into the creation of a thread but according to the white paper and Anders Hejlsberg's PDC presentation (at 31:00) the asynchronous operation happens completely on the main thread. How can I have an operation executed in parallel on the same thread? How is it technically possible and to what is the feature actually

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm building an OpenGL application and on eaglview.m + (Class)layerClass wont work. If i try to run it I get: "Undefined symbols for architecture i386: "_OBJC_CLASS_$_CAEAGLLayer", referenced from: objc-class-ref in GLView.o ld: symbol(s) not found for architecture i386 collect2: ld returned 1 exit status" How can I fix this? 回答1: You need to add the OpenGL and potentially the QuartzCore frameworks to the target to link them. 文章来源: + (Class)layerClass won't work

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I see ant script of Android has message that it is "pre-dexing". However dex and pre-dex uses same options, except that in one case one jar at a time, in other case multiple jars at a time. What is the real need? Is pre-dex mandatory? e.g The ' characters around the executable and arguments are not part of the command. [dex] Pre-Dexing F:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\libs\pinit-sdk-1.0.jar -> pinit-sdk-1.0-e3bebafa2727504605edf3d8d85b5d46.jar [dx] Current OS is Windows 7 [dx] Executing ' D : \Apps\java\embd\cmn

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Here is myscript.sh #!/bin/bash for i in {1..$1}; do echo $1 $i; done If I run myscript.sh 3 the output is 3 {1..3} instead of 3 1 3 2 3 3 Clearly $3 contains the right value, so why doesn't for i in {1..$1} behave the same as if I had written for i in {1..3} directly? 回答1: You should use a C-style for loop to accomplish this: for ((i=1; i This avoids external commands and nasty eval statements. 回答2: Because brace expansion occurs before expansion of variables. http://www.gnu.org/software/bash/manual/bashref.html#Brace-Expansion . If you

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm writing a thread which writes event logs. When the application is closed (gracefully), I need to make sure this thread finishes its job saving the logs before it's free'd. If I call Free directly to the thread, it shouldn't immediately be destroyed, it should wait until the thread is done and there's no more work left to do. Here is how I have my thread's execution laid out: procedure TEventLogger.Execute; var L: TList; E: PEventLog; //Custom record pointer begin while not Terminated do begin //Repeat continuously until terminated try E: