comparison

问题 Part of the program I am creating consists of the user creating conditions which I will store in a mysql database. I want the syntax to be somewhat easier than what php allows but since this will ultimately be run as php code using eval() it needs to have valid syntax. For example: User Input: 4<var1<=9 AND var2<6 Result should be: 4<var1 AND var1<=9 AND var2<6 Before this is eval'd I surround it with an if statement that simply returns true. What would be a good way to detect and split that

问题 #!/usr/bin/env python2.7 import vobject abfile='/foo/bar/directory/file.vcf' #ab stands for address book ablist = [] with open(abfile) as source_file: for vcard in vobject.readComponents(source_file): ablist.append(vcard) print ablist[0]==ablist[1] The above code should return True but it does not because the vcards are considered different even though they are the same. One of the ultimate objectives is to find a way to remove duplicates from the vcard file. Bonus points: Is there a way to

问题 I have a file with rows of 3 columns (tab separated) eg: 2 45 100 And a second file with rows of 3 columns (tab separated) eg: 2 10 200 I want an awk command that matched the lines if $1 in both files matches and the range between $2-$3 in file one interstects at all with the range in $2-$3 in file 2. It can be within the range of values in file 2 or the range in file 2 can be within the range in file 1, or theer can just be a partial overlap. Any kind of intersect between the ranges would

问题 I've found a serious swift-bug in SpriteKit while working with SKSpriteNodes and their colors. This code works fine on all iPhones beside the iPhone 5S: var color1 = UIColor(red: 123/255, green: 123/255, blue: 123/255, alpha: 1) var color2 = UIColor(red: 123/255, green: 123/255, blue: 123/255, alpha: 1) var sprite = SKSpriteNode(color: color1, size: CGSizeMake(100, 100)) if(sprite.color == color2){ println("Same color") } As you see, the two colors are the absolut same. But on the iPhone 5S

问题 Suppose that I have an array bool string[N]={false}; After doing some operations all the elements of the array string become true. And I want to check this condition in an if statement like so:- pseudo code-- if(all the elements of string are same or equal) then do this How do I achieve this?I am not supposed to use counters like for(int i=0;i<N;i++) //or something else like this 回答1: PP just needed to alter his code a tiny bit, the answer he was alluding to was:- if (memcmp (&string [0],

问题 I'm trying to write an instance method for a Card class that compares a single card against an array. The class has some properties like: shape and color . The otherCards array is filled with other instances of this class, that also have their shape s and color s. Now, I want to write a method that can check all of these attributes separately. How can I pass in a particular attribute, as in: [allAttributesIsEqual:otherCards compareWith: self.shape] ? So I can pass in self.shape or self.color

问题 Why is "greater than" comparisons for number values in JavaScript not working. The example below keeps returning true even when the mini number is less than the maxi. mini and maxi are form input values. This example is using jQuery to get the values, but could easily be stripped. var mini = $('form#filterPrice input.min').val(); //eg. 500 var maxi = $('form#filterPrice input.max').val(); //eg. 1500 if( mini.valueOf() > maxi.valueOf() ) { //also used: mini > maxi alert('test'); //alerts "test

问题 I need to monitor the direction a user is indicating using the four directional arrow keys on a keyboard in ActionScript 3.0 and I want to know the most efficient and effective way to do this. I've got several ideas of how to do it, and I'm not sure which would be best. I've found that when tracking Keyboard.KEY_DOWN events, the event repeats as long as the key is down, so the event function is repeated as well. This broke the method I had originally chosen to use, and the methods I've been

问题 What is the difference between = , == , and === ? I think using one equal sign is to declare a variable while two equal signs are for a comparison condition and lastly three equal signs are for comparing values of declared variables. 回答1: You have = the assignment operator , == the 'equal' comparison operator and === the 'identical' comparison operator . $a = $b Assign Sets $a to be equal to $b. $a == $b Equal TRUE if $a is equal to $b. $a === $b Identical TRUE if $a is equal to $b, and they

问题 This question already has answers here : Image comparison - fast algorithm (9 answers) Closed 4 years ago . I am developing an application for the Android platform which contains 1000+ image filters that have been 'evolved'. When a user selects a photo I want to present the most relevant filters first. This 'relevance' should be dependent on previous use cases. I have already developed tools that register when a filtered image is saved; this combination of filter and image can be seen as the