comparison

问题 I'm trying to come up with a program that calculates grades given from the users input. I am also trying to set a limit on how high or low the user input can be (i.e 0 <= or >= 100). But when I use decimal it keeps giving me this error, "Operator '<' cannot be applied to operands of type 'decimal' and 'double'" using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Grade_Program { class Program { static void Main(string[]

问题 I browsed through several similar questions, but they all only state the fact: If ... comparison involves numerical strings, then each string is converted to a number and the comparison performed numerically. Okay, I got it. It explains what is going on when '00001' == '1' returns TRUE . The question is: Why PHP does so? What is the reason for probing strings for being numeric, and then casting if so? Why can't we just compare two strings already? I can fairly understand what casting is

问题 I am trying to compare the time from two NSDate objects but am getting the wrong answer. I think it is because when using the NSDate compare methods it is also including the date. I just want to ignore the date and compare the times. How can this be done? 回答1: well, you can always use NSCalendar's - (NSDate *)dateFromComponents:(NSDateComponents *)comps 来源： https://stackoverflow.com/questions/3773279/comparing-time-in-nsdate

问题 I am attempting to troubleshoot the errors in this piece of code: import time while1 = True def grader (z): if z >= 0 or z <= 59: return "F" elif z >= 60 or z <= 62: return "D-" elif z >= 62 or z <= 66: return "D" elif z >= 67 or z <= 69: return "D+" elif z >= 70 or z <= 62: return "C-" elif z >= 73 or z <= 76: return "C" elif z >= 77 or z <= 79: return "C+" elif z >= 80 or z <= 82: return "B-" elif z >= 83 or z <= 86: return "B" elif z >= 87 or z <= 89: return "B+" elif z >= 90 or z <= 92:

问题 Hi I badly need some help I already search about Jtextfield to be filled before jbutton enables, DocumentListener most people use to determined if Jtextfield is being populated. I tried DocumentListener and it works but all I want is all Jtextfield must be not empty before the Jbutton enables here is my code. Ftext.getDocument().addDocumentListener(new DocumentListener() { @Override public void insertUpdate(DocumentEvent e) { change(); } @Override public void removeUpdate(DocumentEvent e) {

问题 I have two csv files: ipaddress,port 10.140.11.1,80 10.140.11.2,80 ipaddress,port 10.140.11.1,80 10.140.11.2,8008 The question is how to compare the files in powershell. I have already tried this: $file1 = import-csv "csvfile1.csv" $file2 = import-csv "csvfile2.csv" Compare-Object $file1 $file2 -IncludeEqual The result is as those two files were equal. It works as expected if I specify the particular property, e.g: Compare-Object $file1 $file2 -IncludeEqual -Property port How to compare the

问题 I have two csv files: ipaddress,port 10.140.11.1,80 10.140.11.2,80 ipaddress,port 10.140.11.1,80 10.140.11.2,8008 The question is how to compare the files in powershell. I have already tried this: $file1 = import-csv "csvfile1.csv" $file2 = import-csv "csvfile2.csv" Compare-Object $file1 $file2 -IncludeEqual The result is as those two files were equal. It works as expected if I specify the particular property, e.g: Compare-Object $file1 $file2 -IncludeEqual -Property port How to compare the

问题 I was wondering about the garbage collection that takes place in Java. Is it really able to handle all objects that aren't used and free up the most possible memory? I also want to know how does the Java garbage collection compare to another language like lets say C#? And then, how does the automatic garbage collection measure up against manual collection from a language like C? 回答1: Yes, thats the point of garbage collection. There are many different forms of garbage collection. The simplest

问题 I have a program that is zoo and in the zoo there are branched subgroups of animals that are reptiles. When I do an equals method the main program compiles and it runs. I'm confused how does java know to use the equals method if I'm comparing objects and not specifically int or String? public class Zoo { public static void main(String[]args) { Animal a=new Animal("Bob"); Reptile komodo= new Reptile("Snakey"); komodo.bask(); a.size=3; komodo.size=5; System.out.println(a); System.out.println

问题 In python 3, int(50)<'2' causes a TypeError , and well it should. In python 2.x, however, int(50)<'2' returns True (this is also the case for other number formats, but int exists in both py2 and py3). My question, then, has several parts: Why does Python 2.x (< 3?) allow this behavior? (And who thought it was a good idea to allow this to begin with???) What does it mean that an int is less than a str ? Is it referring to ord / chr ? Is there some binary format which is less obvious? Is there