if-statement

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I'm making a terrible 2D remake of Minecraft as a class project in java, and I have a crafting bench thing (or whatever it's called) and I have an if statement that checks if you have one piece of wood in the top left and nothing in the other 3, or if you have one piece of wood in the top right and

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I'm making a terrible 2D remake of Minecraft as a class project in java, and I have a crafting bench thing (or whatever it's called) and I have an if statement that checks if you have one piece of wood in the top left and nothing in the other 3, or if you have one piece of wood in the top right and

问题 I have searched for a solution on the below but cant find anything specific. I have a Powershell script which checks the contents of an XML file which has been manually created/edited by a human for any illegal characters and replaces them with non illegal characters. It uses the Get -Content and Set -Content commands as below. It then copies the file from one location to another. (Get-Content 'C:\SourceLocation\filename.xml') | Foreach-Object {$_ -replace "&", "+" ` -replace "£", "GBP" `

问题 I have been doing work in C language as it was my first language from where i started.This time i was doing some coding with if else statement...and i find something which i cannot understand why it was happening.The code is as follow #include<stdio.h> #include<conio.h> void main() { printf("How If - Else works\n"); if("hello") { printf("Inside if\n"); } else { printf("Inside else\n"); } getch(); } In this the output was Inside if....i want to know how this thing get evaluated inside the if

问题 My code: import org.ujmp.core.Matrix; import org.ujmp.core.SparseMatrix; public class part { public static void main(String args[]) throws Exception{ Matrix Bigomega=Matrix.Factory.zeros(6,6); Matrix omega = SparseMatrix.Factory.zeros(6, 6); int []timea={1,2,3,4,5,6}; int [] timeb={3}; int k1=0,k2=0; while (k1 < timea.length && k2 < timeb.length ) { if (timea[k1] < timeb[k2]) { omega.setAsInt(1, k1, k1); omega.setAsInt(-1, k1, k1 + 1); omega.setAsInt(-1, k1 + 1, k1); omega.setAsInt(1, k1 + 1,

问题 I decaffeinated an old project recently and I noticed that I got a lot of if clauses where the expressions are wrapped in "extra" brackets: if ((data == null) || (data === "")) Is there any case where the wrapping is required? Imho it is the same as: if (data == null || data === "") 回答1: In that case it wouldn't matter, but whenever you remove parentheses from an if statement (or anywhere pretty much) make sure you check the precedence table. For example, removing the parentheses from this:

问题 I am trying to have numbers change by different amounts, by the press of one button. I am new to xcode and do not know how to do this, any help would be nice. I want the number to change to 15, but only when I press the button for a second time. Then, I would like, upon a third press, for the number to change 30. -(IBAction)changep1:(id) sender { p1score.text = @"5"; if (p1score.text = @"5"){ p1score.text = @"15"; //Even if the above worked, I do not know how I would write the code to change

问题 I need to use the following syntax to filter the list operations : a = [ope for ope in operations if ope[0] == 1] The if statement condition is variable and may contain multiple conditions: a = [ope for ope in operations if ope[0] == 1 and ope[1] == "test"] I use a function to build the condition and return it as a string: >>>> c = makeCondition(**{"id": 1, "title": 'test'}) >>>> c "ope[0] == 1 and ope[1] == 'test'" Is there a way to integrate the c variable into the list filtering? Something

问题 I need to use the following syntax to filter the list operations : a = [ope for ope in operations if ope[0] == 1] The if statement condition is variable and may contain multiple conditions: a = [ope for ope in operations if ope[0] == 1 and ope[1] == "test"] I use a function to build the condition and return it as a string: >>>> c = makeCondition(**{"id": 1, "title": 'test'}) >>>> c "ope[0] == 1 and ope[1] == 'test'" Is there a way to integrate the c variable into the list filtering? Something

问题 I don't know why this is not working. I have tried it various ways and it just does not work. It's not that I get an error using the if-statements I made myself, but it doesn't apply right. Basically, there is a column Data$Age and a column Data$Age2 . If Data$Age is value 50 - 100, I want Data$Age2 to say "50-100 Years" for that particular row. Likewise, if Data$Age is 25-50, I want Data$Age2 to say "25-50 Years" for the rows to which it applies. What would the cleanest way to go about doing