logic

问题 This might be a very simple question, or perhaps have been asked before but I couldn't really find an answer after a brief search here and via google. So taking the risk of having missed something similar to this, here goes my question. Why is it so that conditional statements checking for intervals are often not supported as they are, but instead implemented as block if s or using the && operator to bind together the two separate conditions? Admitted that it's not the whole world if I have

问题 I'm reading someone else's code and they have a line like this: $_REQUEST[LINKEDIN::_GET_TYPE] = (isset($_REQUEST[LINKEDIN::_GET_TYPE])) ? $_REQUEST[LINKEDIN::_GET_TYPE] : ''; I just want to make sure I follow this. I might have finally figured out the logic of it. Is this correct? If $_REQUEST[LINKEDIN::_GET_TYPE] is set, then assign it to itself. (meant as a do-nothing condition) otherwise set it to a null string. (Would imply that NULL (undefined) and "" would not be treated the same in

问题 I want to hide and show list items based on their attributed class. The problem is that certain list items have multiple classes. So if I toggle one class then toggle another, any items with both selected classes will be removed. I created a demo of my problem: http://jsfiddle.net/a4NkN/2/ Here's the JS CODE: $('#easy').click(function(){ $(this).toggleClass( "checked" ); $('.easy').toggle(); }); $('#fun').click(function(){ $(this).toggleClass( "checked" ); $('.fun').toggle(); }); $('#silly')

问题 I am making a one-page website for a client. There are 3 different menu groups, but in this example i simplified it to one menu and less content. I have this navigation: <nav> <ul id="main" class="toggle"> <li><a id="design" href="#">DESIGN</a></li> <li><a id="contactus" href="#">CONTACT US</a></li> <li><a id="aboutus" href="#">ABOUT US</a></li> <li><a id="news" href="#">NEWS</a></li> </ul> </nav> And Divs like that below: <div class="designcontent"> Design Content Here </div> <div class=

问题 I'm trying to write a prolog program that determines whether one list is a permutation of another. Input is of the form perm(L,M) , which will be true if and only if list L is a permutation of list M . This is for my AI class, so I cannot just use the nifty little permutation predicate that gprolog already provides. Our professor noted that the member predicate might be useful, but any ideas I have that involve it seem to require very tricky and not-so-declarative things (and I'm assuming

问题 I've been having numerous problems getting this project to work correctly but I'm currently stuck on getting this class to work properly. Whats its suppose to do is take the current station from the radio class and pass it along to this class. The problem is i'm trying to select between AM and FM but every time i run it, it only displays the AM station. I don't understand why it automatically gets set to that station. public class AutoRadioSystem { private Radio selectedRadio; private AMRadio

问题 i'm with this problem at PHP when i'm try to convert an array to an json I have an recursive function that build the array to encode it on jSon format. That's the array: $data = array( array('id' => 1, 'parent_id' => null, 'text' => 'lorem ipsum'), array('id' => 2, 'parent_id' => 1, 'text' => 'lorem ipsum1'), array('id' => 3, 'parent_id' => 1, 'text' => 'lorem ipsum2'), array('id' => 4, 'parent_id' => 2, 'text' => 'lorem ipsum3'), array('id' => 5, 'parent_id' => 3, 'text' => 'lorem ipsum4'),

问题 I am trying to do one multi map(4 variables) using boost- multi index. Can I know how to get the value of a particular index like tmp_Container.get<name>().find("aaa")->firstVariable EDIT struct EnumStruct { int microsoftEnum; std::string microsoftEnumString; int localEnum; std::string localEnumString; } typedef bmi::multi_index_container< EnumStruct, bmi::ordered_unique<bmi::tag<localEnum>,bmi::member < EnumStruct,std::string,&EnumStruct::localEnumString > > > > boost_Enum_Container; boost

问题 This is a follow-up question for this one. For example, let's say I have three procedures that I need to run no matter what and exit if all of them return 1. while (&proc1 && &proc2 && &proc3); Because Perl is using short-circuit evaluation, the code may or may not execute subs &proc2 and &proc3 depending on preceding operands (if an operand is false the following operands won't be executed; more info here and on wiki). If needed, is there any way to turn the feature off? 回答1: You can use the

问题 this is my code currently, I am trying to solve the zebra puzzle. exists(A,(A,_,_,_,_)). exists(A,(_,A,_,_,_)). exists(A,(_,_,A,_,_)). exists(A,(_,_,_,A,_)). exists(A,(_,_,_,_,A)). rightOf(A,B,(B,A,_,_,_)). rightOf(A,B,(_,B,A,_,_)). rightOf(A,B,(_,_,B,A,_)). rightOf(A,B,(_,_,_,B,A)). middleHouse(A,(_,_,A,_,_)). firstHouse(A,(A,_,_,_,_)). nextTo(A,B,(B,A,_,_,_)). nextTo(A,B,(_,B,A,_,_)). nextTo(A,B,(_,_,B,A,_)). nextTo(A,B,(_,_,_,B,A)). nextTo(A,B,(A,B,_,_,_)). nextTo(A,B,(_,A,B,_,_)). nextTo