compare

Can you compare chars with ==? [duplicate]

℡╲_俬逩灬. 提交于 2019-11-28 07:44:07
问题 This question already has answers here : What is the difference between == and equals() in Java? (23 answers) Closed last year . For Strings you have to use equals to compare them, because == only compares the references. Does it give the expected result if I compare chars with == ? I have seen similar questions on stackoverflow, E.g. What is the difference between == vs equals() in Java? However, I haven't seen one that asks about using == on chars. 回答1: Yes, char is just like any other

In Swift 3, what is a way to compare two closures?

。_饼干妹妹 提交于 2019-11-28 07:30:45
问题 Suppose you have two closures of type (Int)->() in Swift 3 and test to see if they are the same as each other: typealias Baz = (Int)->() let closure1:Baz = { print("foo \($0)") } let closure2:Baz = { print("bar \($0)") } if(closure1 == closure2) { print("equal") } This fails to compile, giving the message: Binary operator '==' cannot be applied to two '(Int)->()' operands OK, well, how then can we compare two closures of the same type, to see if they are the same? 回答1: I'm pretty sure there

Objective-C: Comparing an image against another image that has been previously saved

前提是你 提交于 2019-11-28 07:26:17
问题 I have a question about comparing UIImages in Objective-C when one image has already been through a save and load process using the NSSearchPathForDirectoriesInDomains method. The aim of what I want is to direct the user to a new screen upon a click depending on what the image displays. For simplicity let's say that there are two possibilities - a black image and a green image. Clicking on the black image takes you to xib1 and clicking the green image takes you to xib2. This is simple enough

[Beyond Compare] 排除/忽略 .svn 文件夹

天涯浪子 提交于 2019-11-28 07:23:31
[Beyond Compare] Exclude .svn folders Beyond Compare 3 Session >> Session Settings... >> Filter by Name >> Exclude folders: >> .svn Beyond Compare 2 Session >> File Filters... >> Exclude folder 另外,我发现 Rules-based comparison 比 Binary comparison 能过滤掉更多的无需同步的文件。 来源: https://www.cnblogs.com/chenjo/p/11398691.html

方法重载(一)

泪湿孤枕 提交于 2019-11-28 07:14:45
方法重载 :指在同一个类中,允许存在一个以上的同名方法,只要它们的参数列表不同即可,与修饰符和返回值类型无关。 参数列表:数据类型个数不同,数据类型不同,数据类型顺序不同。 重载方法调用:JVM通过方法的参数列表,调用不同的方法。 #### 方法重载练习一:比较两个数据是否相等 比较两个数据是否相等。参数类型分别为两个`byte`类型,两个`short`类型,两个`int`类型,两个`long`类型,并在`main`方法中进行测试。 public class Method_Demo6 { public static void main(String[] args) { //创建 Count c = new Count(); //定义不同数据类型的变量 byte a = 10; byte b = 20; short c = 10; short d = 20; int e = 10; int f = 10; long g = 10; long h = 20; // 调用 System.out.println(c.compare(a, b)); System.out.println(c.compare(c, d)); System.out.println(c.compare(e, f)); System.out.println(c.compare(g, h)); } } class

Comparing folders and content with PowerShell

孤者浪人 提交于 2019-11-28 06:29:30
PowerShell noob here. I have two different folders with xml files. One folder (folder2) contains updated and new xml files compared to the other (folder1). I need to know which files in folder2 are new/updated compared to folder1 and copy them to a third folder (folder3). What's the best way to accomplish this in PowerShell? OK, I'm not going to code the whole thing for you (what's the fun in that?) but I'll get you started. First, there are two ways to do the content comparison. The lazy/mostly right way, which is comparing the length of the files; and the accurate but more involved way,

Why do comparisions between very large float values fail in python?

廉价感情. 提交于 2019-11-28 06:17:07
问题 In my understanding, sys.float_info.max is the largest possible float value. However, it seems that comparing such large values fail . import math import sys m = sys.float_info.max # type 'float' m == m # True m < m # False m > m # False m == m-1.0 # True m < m-1.0 # False m > m-1.0 # False m == m-1e100 # True m < m-1e100 # False m > m-1e100 # False m == m-1e300 # False m > m-1e300 # True m < m-1e300 # False I assume that's because of the limited precision? If so, in what numerical range can

How to compare two maps by their values

让人想犯罪 __ 提交于 2019-11-28 06:03:00
How to compare two maps by their values? I have two maps containing equal values and want to compare them by their values. Here is an example: Map a = new HashMap(); a.put("foo", "bar"+"bar"); a.put("zoo", "bar"+"bar"); Map b = new HashMap(); b.put(new String("foo"), "bar"+"bar"); b.put(new String("zoo"), "bar"+"bar"); System.out.println("equals: " + a.equals(b)); // obviously false How should I change the code to obtain a true? Jon Skeet Your attempts to construct different strings using concatenation will fail as it's being performed at compile-time. Both of those maps have a single pair;

Diff between two dataframes in pandas

我只是一个虾纸丫 提交于 2019-11-28 05:52:47
问题 I have two dataframes both of which have the same basic schema. (4 date fields, a couple of string fields, and 4-5 float fields). Call them df1 and df2 . What I want to do is basically get a "diff" of the two - where I get back all rows that are not shared between the two dataframes (not in the set intersection). Note, the two dataframes need not be the same length. I tried using pandas.merge(how='outer') but I was not sure what column to pass in as the 'key' as there really isn't one and the

Linq where clause compare only date value without time value

删除回忆录丶 提交于 2019-11-28 04:50:38
var _My_ResetSet_Array = _DB .tbl_MyTable .Where(x => x.Active == true && x.DateTimeValueColumn <= DateTime.Now) .Select(x => x); Upper query is working correct. But I want to check only date value only. But upper query check date + time value. In traditional mssql, I could write query like below. SELECT * FROM dbo.tbl_MyTable WHERE CAST(CONVERT(CHAR(10), DateTimeValueColumn, 102) AS DATE) <= CAST(CONVERT(CHAR(10),GETDATE(),102) AS DATE) AND Active = 1 So could anyone give me suggestion how could I check only date value in Linq. There is also EntityFunctions.TruncateTime or DbFunctions