while-loop

PHP Error: ob_flush() [ref.outcontrol]: failed to flush buffer. No buffer to flush

由 蓝咒 提交于 2019-11-30 17:47:54
Could someone please save these 2 files and run them and tell me why I get the error " ob_flush() [ref.outcontrol]: failed to flush buffer. No buffer to flush". I tried googling around and it says that I have to use ob_start(); but when I do then it doesn't print out line by line, but rather returns the whole object from the FOR loop when it has completed. I'm kinda new to PHP so I'm not sure where else to look.. test_process.php // This script will write numbers from 1 to 100 into file // And sends continuously info to user $fp = fopen( '/tmp/output.txt', 'w') or die('Failed to open'); set

When would a do-while loop be the better than a while-loop?

由 帅比萌擦擦* 提交于 2019-11-30 17:22:04
问题 This is a highly subjective question, so I'll be more specific. Is there any time that a do-while loop would be a better style of coding than a normal while-loop? e.g. int count = 0; do { System.out.println("Welcome to Java"); count++; } while (count < 10);` It doesn't seem to make sense to me to check the while condition after evaluating the do-statement (aka forcing the do statement to run at least once). For something simple like my above example, I would imagine that: int count = 0; while

Counting digits using while loop

由 情到浓时终转凉″ 提交于 2019-11-30 17:00:19
问题 I was recently making a program which needed to check the number of digits in a number inputted by the user. As a result I made the following code: int x; cout << "Enter a number: "; cin >> x; x /= 10; while(x > 0) { count++; x = x/10; } From what I can tell (even with my limited experience) is that it seems crude and rather unelegant. Does anyone have an idea on how to improve this code (while not using an inbuilt c++ function)? 回答1: In your particular example you could read the number as a

Re-prompt user after invalid input in Java

由 拟墨画扇 提交于 2019-11-30 16:59:26
I'm writing this program in java where I need to re-prompt the user after an invalid input. I came to a solution only to discover that if the user enters another invalid input after the re-prompt then it continues. Can someone please show me a better solution to this? I'll show you what I had anyway: System.out.println("What is your age?\n"); age = userInput.nextInt(); if((age > 120) || (age < 1)) {//error message System.out.println("ERROR Please enter a valid age"); System.out.println(""); System.out.println("What is your age?\n"); age = userInput.nextInt(); }//end if if the user entered an

How Can I simulate a while loop in Prolog with unchangeable conditions?

由 笑着哭i 提交于 2019-11-30 15:52:11
问题 So basically I am trying to simulate some C code in Prolog. It is easy to simulate while loop in Prolog Here is the case: C code: int a = 1; while(N) { N--; a++; } Prolog code: prolog_while(0) : ! prolog_while(N, A) : N1 is N -1, A1 is A + 1, prolog_while(N1, A1). One problem is how to simulate a while loop in Prolog with unchangeable conditions? Here is the case: int n = 1; int a = 1; while(1) { if (N==0) goto while_end; else { N--; A++; } } Or while(1) { if (N==0) break; else { N--; A++; }

How to retrieve hierarchical data from a SQL Table?

由 最后都变了- 提交于 2019-11-30 15:50:31
问题 I have got the below stored procedure to return the list of Id, parentId and absoluteUrls which works fine: ALTER PROCEDURE [dbo].[SearchDataManager.HierarchyById] @currentId AS int AS BEGIN DECLARE @id INT DECLARE @parentId INT DECLARE @absoluteUrl NVARCHAR(1000) DECLARE @Hierarchy TABLE (Id int, ParentId int, AbsoluteUrl nvarchar(1000)) WHILE @currentId != 0 BEGIN SELECT @id = Id, @parentId = ParentId, @absoluteUrl = AbsoluteUrl FROM dbo.[SearchDataManager.NiceUrls] WHERE id = @currentId

Invalid token 'while' in class, struct, or interface member declaration in very simple code

由 时光总嘲笑我的痴心妄想 提交于 2019-11-30 15:14:09
问题 I am not sure what the problem is but I keep receiving this error when I try to use a while statement in my code. Invalid token 'while' in class, struct, or interface member declaration I want to use a while loop to have something continuously update while a statement is true. The rest of my code is rather long but whenever I type in the syntax: while(a<b) { //do whatever i want it to do here } It gives me that compiler error right off the bat. Not quite sure what the problem is. I am doing

How to read from user within while-loop read line?

由 对着背影说爱祢 提交于 2019-11-30 14:50:38
I had a bash file which prompted the user for some parameters and used defaults if nothing was given. The script then went on to perform some other commands with the parameters. This worked great - no problems until most recent addition. In an attempt to read the NAMES parameter from a txt file, I've added a while-loop to take in the names in the file, but I would still like the remaining parameters prompted for. But once I added the while loop, the output shows the printed prompt in get_ans() and never pauses for a read, thus all the defaults are selected. I would like to read the first

How Can I simulate a while loop in Prolog with unchangeable conditions?

由 邮差的信 提交于 2019-11-30 14:41:11
So basically I am trying to simulate some C code in Prolog. It is easy to simulate while loop in Prolog Here is the case: C code: int a = 1; while(N) { N--; a++; } Prolog code: prolog_while(0) : ! prolog_while(N, A) : N1 is N -1, A1 is A + 1, prolog_while(N1, A1). One problem is how to simulate a while loop in Prolog with unchangeable conditions? Here is the case: int n = 1; int a = 1; while(1) { if (N==0) goto while_end; else { N--; A++; } } Or while(1) { if (N==0) break; else { N--; A++; } } I know it is kinda of weird but basically these kind of C code is automatically generated by a source

Have extra while loop conditions … based on a condition?

由 纵然是瞬间 提交于 2019-11-30 14:14:50
The variable a can take any number of values. The value of a is the amount of extra pre-defined conditions to have for the while loop. This can be done with multiple elif statements but is there a cleaner way of doing this? if a == 0: while condition_1: ... elif a == 1: while condition_1 or condition_2: ... elif a == 2: while condition_1 or condition_2 or condition_3: ... A general way of doing what other languages do with a switch statement is to create a dictionary containing a function for each of your cases: conds = { 0: lambda: condition_1, 1: lambda: condition_1 or condition_2, 2: lambda
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