while-loop

问题 I am developing a small script and I am bit messed up with using a couple of curl and while loop. I want to stop processing curl at a point when one of the URL is giving me a information. Note: I have multiple curl requests. So my concept is, I have a couple of URLS, which I have to process and get information from. If information is found on a particular URL, it will be giving me a string. If no information is found, it will give me no value. So I have nearly 10 URLs to process approximately

问题 My tables structures are `TblTeam` (`TeamID`, `TeamName`) VALUES (1,'India'), (2,'Pakistan'), (3,'Brazil') (4,'Poland'); `TblMatch` (`MatchID`, `MatchDate`, `MatchStart`, `MatchEnd`, `Team1ID`, `Team2ID`) VALUES (1, '19-11-2014', '12:00:00', '13:00:00', 1, 2), (2, '19-11-2014', '13:10:00', '14:10:00', 4, 3), (3, '19-11-2014', '14:20:00', '15:20:00', 1, 3), (4, '19-11-2014', '15:30:00', '16:30:00', 4, 2), (5, '20-11-2014', '10:00:00', '11:00:00', 1, 4), (6, '20-11-2014', '11:10:00', '12:10:00'

问题 I want to run a while(or any) loop to output a small list of dates as an array $start = $day = strtotime("-1 day"); $end = strtotime('+6 day'); while($day < $end) { echo date('d-M-Y', $day) .'<br />'; $day = strtotime("+1 day", $day) ; } This works fine for printing, but I want to save it as an array (and insert it in a mysql db). Yes! I don't know what I'm doing. 回答1: to create a array, you need to first initialize it outside your loop (because of variable scoping) $start = $day = strtotime(

问题 I am confuse about this symbol (<-) in Chrome DevTools It's return value or console value? When I run this while loop var i = 0; while (i < 5) { console.log(i); i++; } the console log spits out 4 twice, the last 4 have a (<-) in a front, what's meaning? 回答1: This has to do with the nature of the eval function. Note that: var i = 0, j = while(i < 5) { i++; }; Produces a compile error. However, var i = 0, j = eval('while(i < 5) { i++; }'); Assigns the value 4 to j . Why is this? Quoting from

问题 I have two tables to be joined, 1 is user and 1 is attendance. TABLE : attendance id userId totalHours 1 1 0745 2 3 0845 3 1 0945 TABLE : user id name departmentId 1 John 2 2 Sean 2 3 Allan 2 Not every user have attendance record (their totalHours) But I need to query by userId WHERE departmentId = XXXX and SUM each of their totalHours that exist, without neglecting the userId without any record in attendance. So far I made this: $result = mysqli_query($con,"SELECT * FROM user WHERE

问题 I just want to be sure that this C code: while(flag==true) { } foo(); does the same as this: while(flag==true); foo(); 回答1: ; alone is a null statement in C. In your case, {} or ; are syntactically needed, but they do the same: nothing Related: Use of null statement in C 回答2: In addition to the other answers: It's the same thing. But I prefer this: while (condition) { } foo(); over this: while (condition); foo(); because if you forget the semicolon after the while, your code will compile fine

问题 I have two output files: FILE-A contains 70,000+ unique entries. FILE-B contains a unique listing that I need to remove from FILE-B. FILE-A: TOM JACK AILEY BORG ROSE ELI FILE-B Content: TOM ELI I want to remove anything listed in FILE-B from File-A. FILE-C (Result file): JACK AILEY BORG ROSE I assume I need a while r for i statement. Can someone help me with this? I need to cat and read FILE-A and for every line in FILE-B I need to remove that from FILE-A. What command should I use? 回答1: You

问题 I have been having some trouble recently with creating a program that counts in binary from 1 to the chosen number. This is my code at the moment: num6 = 1 binStr = '' num5 = input('Please enter a number to be counted to:') while num5 != num6: binStr = str(num6 % 2) + binStr num6 //= 2 num6 = num6 + 1 print(binStr) For example, if I input 5, it needs to go 1, 10, 11, 100, 101. I just can't seem to get the hang of it. Any help will be appreciated, thanks. 回答1: The issue is that you're dividing

问题 1.Why does while (<$filehandle>) iterate through a file seemlessly, but it doesn't iterate through lists or arrays without manipulating the array itself (like using while ($_ = shift @array){print $_} ? How does this happen? 2.How is it that while ($var = @array){print $var} manages to iterate through the whole array? Shouldn't $var just get the number of indices in @array and return that value (so creating an infinite loop)? From my understanding while() reads the conditionality of a

问题 I'm trying to read in and add up (only) positive integers until a negative integer is entered. The program is supposed to stop only when a negative integer is entered. The best I've been able to come up with is the code below but the problem is it doesn't stop even when a negative integer is read. PS: I'm still learning so please bear with me. I've tried adding && input2!<0 to the while loop condition but it comes up as an error. Any suggestions as to how I can make it behave the way I want