我有以下代码
public static int unknown(String x)
{
if ((x.length()==1) && (x.equals("1")))
return 1;
else if ((x.length()==1) && (x.equals("0")))
return 0;
else if (x.charAt(x.length()-1)=='1')
return 1+ 2*unknown(x.substring(0,x.length()-1));
else
return 0+2*unknown(x.substring(0,x.length()-1));
}
我的教授说我必须绘制递归调用的图表.他在谈论什么样的图表？我应该如何展示它？谢谢.
PS正在调用的字符串是"101011",或43.
-担
我正在创建一个Android应用程序,它使用JSON对象创建一个文本文件并将其写入内部存储.我有以下代码来做到这一点:
JSONObject myJSON = new JSONObject();
//Set the JSON object with website, length and Id (time-stamp)
try {
myJSON.put("Length", trim)
.put("Website", data)
.put("Id", tx);
} catch (JSONException e1) {
e1.printStackTrace();
}
//Convert JSON object to a string and add a comma
String myJSONString = myJSON.toString();
myJSONString += ", ";
try {
FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_APPEND);
fos.write(myJSONString.getBytes());
fos.close();
//Log.d(TAG, "Written to file");
} catch (Exception e) {
Log.d(TAG, "cought");
e.printStackTrace();
}
现在我得到一个看起来像这样的文本文件:
{"Id":"20101211T155146","Length":10}, {"Id":"20101211T155155","Length":10},
{"Id":"20101211T155203","Length":10}, {"Id":"20101211T155252","Length":10},
我现在想在JSON文件中收集这些数据.该应用程序需要编写,存储和检索JSON.问题是当我使用以下方法解析文件中的JSON对象时:
String x = …我不是在谈论array_flip(),我想在没有数字/字母顺序的基础上反转数组,只是倒置.
例:
array('music','television','hollywood');
将会:
array('hollywood','television','music');
谢谢!
VisualVM和Eclipse TPTP有什么区别？
我正在使用Mac OS X,我正在尝试从Mono Basics网站运行以下代码:
using Gtk;
using System;
class Hello {
static void Main()
{
Application.Init ();
Window window = new Window ("helloworld");
window.Show();
Application.Run ();
}
}
然后我用以下命令编译:
gmcs hellogtk.cs -pkg:gtk-sharp-2.0
我收到以下错误:
Package gtk-sharp-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk-sharp-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk-sharp-2.0' found
error CS8027: Error running pkg-config. Check the above output.
我不知道软件包目录在我的计算机上的位置,所以我不知道将PKG_CONFIG_PATH设置为什么.你们有没有人在Mac OS X上使用Mono,你能指出我正确的方向,这些文件在哪里以及我应该将PKG_CONFIG_PATH设置为什么？
我正在尝试将memcached安装到REDHAT Enterprise 5.5 x86_64
我试过了:
root@sv [~]# yum -y install memcached
然后收到以下错误
--> Running transaction check
---> Package memcached.x86_64 0:1.4.5-1.el5.rf set to be updated
--> Processing Dependency: perl(AnyEvent) for package: memcached
--> Processing Dependency: perl(AnyEvent::Socket) for package: memcached
--> Processing Dependency: perl(AnyEvent::Handle) for package: memcached
--> Processing Dependency: perl(YAML) for package: memcached
--> Processing Dependency: perl(Term::ReadKey) for package: memcached
--> Processing Dependency: libevent-1.1a.so.1()(64bit) for package: memcached
--> Running transaction check
---> Package compat-libevent-11a.x86_64 0:3.2.1-1.el5.rf set to be updated
---> Package …我有一堆艺术家存储在CoreData中,并希望按名称对它们进行排序,但忽略前缀"the".因此,例如"甲壳虫乐队"将被归类为"甲壳虫乐队",有点像iTunes/iPod所做的那样.
所以我尝试cleanName在Artist模型中添加一个自定义属性,以便它可以用于排序:
NSSortDescriptor *sortByName = [[NSSortDescriptor alloc] initWithKey:@"cleanName" ascending:YES];
这显然会降低应用程序,因为cleanName它不是SQLEntity的属性:
...keypath cleanName not found in entity <NSSQLEntity Artist id=1>
我知道我可以在商店中保存cleanName,但这对我来说似乎不对.一个新的属性只是将名称剥离了"the"前缀？真？
所以相反,我尝试使用自定义compareObject:toObject:implementation来子类化NSSortDescriptor:
- (NSComparisonResult)compareObject:(Artist*)artist1 toObject:(Artist*)artist2 {
NSString *cleanString1 = [artist1.name stringByReplacingOccurrencesOfString:@"the " withString:@"" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [artist1.name length])];
NSString *cleanString2 = [artist2.name stringByReplacingOccurrencesOfString:@"the " withString:@"" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [artist2.name length])];
return [artist1.cleanName compare:artist2.cleanName options:NSCaseInsensitiveSearch];
}
当我添加一位新艺术家,将"披头士乐队"添加到我的商店时,这就有效.艺术家被分类为"披头士乐队"并显示在我的"B"部分内.但是一旦我退出应用程序并重新启动它,我就会收到以下错误,并且tableview只保持空白:
sectionIndex A for Apparat
sectionIndex B for Bonobo
sectionIndex M for Misteur Valaire
sectionIndex M for Moderat
sectionIndex P for Paul Kalkbrenner
sectionIndex …每当我尝试在Xcode中启动iphone模拟器(通过Build&Run)时,模拟器就会出现并立即挂起沙滩球.
我已经尝试构建并运行一个空白项目,重新启动Xcode和我的机器,到目前为止没有任何帮助.我正在运行Snow Leopard 10.6.5,Xcode 3.2.5和Simulator 4.2.
我的控制台中出现的唯一错误是:
12/11/10 6:03:02 PM installd[1134] CFPreferences: user home directory at file://localhost/Users/Old%20Mac/Library/Application%20Support/iPhone%20Simulator/4.2/ is unavailable. User domains will be volatile.
12/11/10 6:03:42 PM com.apple.launchd.peruser.502[117] (com.apple.iPhoneSimulator:com.apple.mobile.installd[1155]) Exited with exit code: 255
12/11/10 6:03:42 PM com.apple.launchd.peruser.502[117] (com.apple.iPhoneSimulator:com.apple.mobile.installd) Throttling respawn: Will start in 10 seconds
模拟器在黑屏上保持冻结:![冻结!]
任何帮助将非常感谢 - 谢谢!
我应该在我的任意结构中实现什么成员才能使以下任务成为可能:
public struct MyStruct {
String s;
Int length;
}
MyStruct myStruct = new MyStruct { s = "Hello", length = 5 };
// Now, I want the following code to set the 's' to "Lol" and the
// length to 3 (length of "Lol"). The second part should be done
// automatically.
myStruct = "Lol"; // Or myStruct = String("Lol");
该怎么做？
我想在Thread中执行django的call_method.这是示例代码:
import sys
sys.path.append("/my/django/project/path/")
import threading
import time
# Import my django project configuration settings
from django.core.management import setup_environ
from mydjangoprojectname import settings
setup_environ(settings)
from django.core.management import call_command
class ServerStarter(threading.Thread):
def __init__(self):
super(ServerStarter, self).__init__()
print "ServerStarter instance created"
def run(self):
print "Starting Django Server..."
call_command("runserver", noreload=True)
if __name__ == '__main__':
starter = ServerStarter()
starter.start()
------------------------------
OutPut:
ServerStarter instance created
Starting Django Server...
ServerStarter instance created
Starting Django Server...
Validating models...
0 errors found
Django version 1.2.3, using settings 'mydjangoprojectname.settings'
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