while-loop | 易学教程

How is it possible to use a while loop to print even numbers 2 through 100?

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问题 I am a beginner and I am stuck on this problem, "Write a python code that uses a while loop to print even numbers from 2 through 100. Hint ConsecutiveEven differ by 2." Here is what I came up with so far: while num in range(22,101,2): print(num) 回答1: Use either for with range() , or use while and explicitly increment the number. For example: >>> i = 2 >>> while i <=10: # Using while ... print(i) ... i += 2 ... 2 4 6 8 10 >>> for i in range(2, 11, 2): # Using for ... print(i) ... 2 4 6 8 10

Array of Char[ ] , find some letter in an array

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问题 I have to do a method that finds if an array of char[ ] like {'d','e','f' } is inside of an other array of char[ ] like {'a','b','c','d','e','f','x','r'} ... So , i want that my "x" inside while cicle raises when a letter is found . For example , when my for cycle finds the 1st letter my x= 1 , if for cycle finds the 2nd letter my x = x+1 and so on ... So my x should be equal to the length of the array {'d','e','f'} . Whereas if i have to find an array like {'d','e','f'} in an other array

How to convert few columns as JSON array in php while csv import

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问题 i have a csv file, please see this below image of my CSV and this is my table i need a help to split few columns and convert as an array and insert in to table, lets say i want to exclude the first column which is 'product_id' from the array and remaining all columns as array and insert in to table, so the expected query will be like insert into process_detail (product_id,product_attributes) values ($product_id,'[{"color":"blue","style":"classic","material_type":"etc","length":"35 cm","price"

Apache ant buildfile looping

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问题 Lord of all beginners here. I'm trying to make a target in a build.xml that restarts itself when it meets a certain condition. I've searched high and low and I can't come up with a solution to make the target...well...loop. I'm stuck on this and it's driving me crazy, so any help is welcomed. Edit: This is the target I want to loop: <target name="prog" description="executes program"> <parallel> <daemons> <exec executable="mch" /> </daemons> </parallel> <exec executable="calculator"

Trouble creating an excel Do Loop

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问题 I have data that I need to create some sort of loop for. Basically, I'm searching for a column that has the info I need using a string search, then summing based on various criteria. My problem is that the data is separated by months (using a numberical designation; i.e; Jan=01, Feb=02, etc) and I need a way to add up all the info to date. The formula I am using is below: =SUMPRODUCT(SUMIFS(INDEX('Program Data'!A:GA,0,MATCH("*"&AC7&" "&AC10&" -"&A8&" "&B15&"*", 'Program Data'!1:1,0)),'Program

How does this while loop exit?

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So, how does this code exit the while statement when the thread is started? (Please do not consider indentation) class ThreadUrl(threading.Thread): """Threaded Url Grab""" def __init__(self, queue, out_queue): threading.Thread.__init__(self) self.queue = queue self.out_queue = out_queue def run(self): while True: #grabs host from queue host = self.queue.get() #grabs urls of hosts and then grabs chunk of webpage url = urllib2.urlopen(host) chunk = url.read() #place chunk into out queue self.out_queue.put(chunk) #signals to queue job is done self.queue.task_done() ** EDIT * The code that starts

java loop, if else [closed]

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问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . I know this is something very simple, however, I've only been programming for a couple months so my brain just fog's out sometimes, and I need help with

While loops duplicates printf two times before getting to getchar()? [duplicate]

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问题 This question already has answers here : Using getchar() in a while loop (3 answers) Closed 6 years ago . I'm currently learning C and C++ on my own. In this little "program practice" I ask the user to enter either 'i' or 'd' to know whether they want to work with integers or decimal (float) numbers. I have a while loop that makes sure the user enter 'i' or 'd' by telling them if they entered the wrong char. For some reason, the prompt inside the while loop prints two times before going to

Issues getting table headers to position correctly

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问题 I am having difficulties with a table I am trying to create. I have a users array that displays the users in my database table. There is 10 users in this. Then I should have 14 players under each user. Like this... user1 user2 user3 player1 player1 player1 player2 player2 player2 player3 player3 player3 etc.. Right now it is doing this Here is my code... <table class="draft_border_table"> <tr> <th>Rnd</th> <th><?php echo "<div>" . $draft_order_row['username'] . "</div>"; ?></th> <?php while(

mysqli_fetch_array starting the query on a certain row

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问题 I am trying to create pagination on some pages that display rows from a MySQL table. Each page displays six items from the table. I am using a while loop with: $row_users = mysqli_fetch_array($result_users, MYSQL_NUM); It just keeps looping through the results until there are no more (I would include the full code but it's part of a very large amount of elements). I have a GET variable from the page id as: $page = $_GET['page']; Basically I want to start the fetch array on the specific row