if-statement

问题 well to begin with I'm sure this is a simple question. I am developing an iPhone app with the iAd Framework, which only runs for iOS 4.0 or higher. Still, I wanna choose a iPhone OS 3.0 deployment target, which causes everything to crash. How do I conditionally include the iAd framework? ...I mean, it would be something like: ...if([[UIDevice currentDevice] systemVersion]>=4.0]) #import Obviously this won't work because I don't know the correct syntax. Also: How do I conditionally declare an

问题 well to begin with I'm sure this is a simple question. I am developing an iPhone app with the iAd Framework, which only runs for iOS 4.0 or higher. Still, I wanna choose a iPhone OS 3.0 deployment target, which causes everything to crash. How do I conditionally include the iAd framework? ...I mean, it would be something like: ...if([[UIDevice currentDevice] systemVersion]>=4.0]) #import Obviously this won't work because I don't know the correct syntax. Also: How do I conditionally declare an

问题 I'm wanting to make it so if headphones are plugged in the device something happens such as a notification icon appears. (I already have the notification icon stuff done) But I can't seem to find a way to make it happen. I'm wanting something like this if headphones_plugged_in { do this } I found this online AudioManager.isWiredHeadsetOn() I just don't know how I would use that. I already added the right permissions in the manifest too! If you could guide me or link me to something it would

问题 I want to be able to get the results of Invoke-WebRequest and have my script print either "Failed" if the server was not reached or "Online" if it was reached. This is what I'm doing to try to do that. $IW_Results = $Servers_to_Check | ForEach-Object { Invoke-WebRequest -Uri $_ } $err = $IW_Results | ?{$_.gettype().Name -eq "ErrorRecord"} if($err){ Write-Output "Failed" } else { Write-Output "Online" } I was able to get the script to print "Online" if the server is reached. However when it

问题 This question already has answers here : How to test multiple variables against a value? (24 answers) Closed 4 months ago . im going to need multiple if statements comparing to the same couple elements, and was wondering if there was something along these lines i could do to make the code cleaner and easier. Example would be that this function. def test(num): a = [1, 2, 3] if num == a : return True else : return False would return >>>test(1) True >>>test(2) True >>>test(5) False Instead of

问题 I am using the code from the folling link on mouseover function http://perplexed.co.uk/1991_jquery_scroll_tabs_like_browser_tabs.htm i check the values of offset during mouseover and set the visibility prev and next button. But the checking always happens in the next mouseover . Eg: i have to set the next button to invisible during the same mouse over event when i scroll and reach the end. but it happens in the next mouseover. Is it posiible to write an if function within the animate function

问题 I need help creating a formula that rounds a number with a 1 or 6 in the ones place down to the nearest multiple of 5 (e.g., 276 to 275 or 131 to 130) and rounds any other number up to the nearest multiple of 5 (e.g., 277 to 280 or 132 to 135). I figured the logic would look something like this: =if(can't figure out this condition, ceiling(A1,5), floor(A1,5)) 回答1: You can use MROUND instead: =MROUND(A1,5) It rounds to the nearest 5. Anything including and above 277.5 will be rounded to 280,

问题 What I would like the code below to do is parse a file with lines similar to CSC3320,SYSTEM LEVEL PROGRAMMING,3,1,A CSC3210,ASSEMBLY LEVEL PROGRAMMING,3,1,B and calculate the GPA based off of the equation sum of grade * credit hours / sum of credit hours. I attempt to do this by calculating the numerator and denominator separately and then dividing the two and printing the output. calculate(){ awk -F, ' numerator=0; denominator=0; if($4==1) { if($5=="A"){ numerator+=(4*$3); denominator+=$3 }

问题 I have two dataframes. One that has a list of unique ID numbers (think customer names and demographic data) and another dataframe with a list of transaction data (think purchase data, $ amount, etc) where the same unique ID number is also a column. I'd like to create a dummy variable using a nested ifelse statement that searches the transaction dataframe using the unique ID and then check if a second attribute matches between the two dataframes. For example: data.frame3$dummy_variable <-

问题 I am trying to loop over a dictionary and call a function on each key. If the function does not return None entry for that key, I want the output to be appended to a list and I also want that key to be appended to a second list. Here is my code: output_list = [] key_list =[] for i in dict.keys(): if obj.method(i): output_list.append(obj.method(i)) key_list.append(i) return output_list return key_list However, for some reason the second list, key_list , is never populated - can you not have