while-loop

问题 This question already has answers here : Float comparison gives different results (7 answers) Closed 2 years ago . I wrote the following code: #include <stdio.h> int main () { float x = 1.1; printf("%s\n", "Hello!"); while (x == 1.1) { printf("%s\n", "Hey there!"); printf("%f\n", x); x = x - 0.1; } printf("%s\n", "Bye!"); return 0; } However the output was (which I assume was not expected): aps120797@XENON-PC:/mnt/d/Codes/LetUsC$ gcc C04Ag.c aps120797@XENON-PC:/mnt/d/Codes/LetUsC$ ./a.out

问题 I have a scenario where I want to check the value of a cell in an application. When the value of the cell hits 0 or -1 I'd like the test to continue. So I have: while (!cell.Value.Equals("0") || !cell.Value.Equals("-1")) { Console.WriteLine("Value ({1})",cell_value.Value); Thread.Sleep(15000); } Unfortunately, when the cell reaches 0, it doesn't appear to 'break' out of the loop. Output: Value (20) Value (13) Value (10) Value (9) Value (4) Value (1) Value (0) Value (0) Value (0) Value (0) Is

问题 I am trying to using a while loop inside a for loop in Matlab. The while loop will repeat the same action until it satifies some criteria. The outcome from the while loop is one iteration in the for loop. I am having a problem to get that correctly. n=100; for i=1:n while b<0.5 x(i)=rand; b=x(i); end end I am not sure what i am doing wrongly. Thanks 回答1: With the example you showed, you have to initialize b or the while -statement cannot be evaluated when it is first called. Do it inside the

问题 I'll just get to the code to show you, I'm trying to stop my while loop when my timer is over. Is there a way to do that? from threading import Timer def run(timeout=30, runs): timer(timeout) while runs > 0 or over(): #Do something print "start looping" def timer(time): t = Timer(time, over) print "timer started" t.start() def over(): print "returned false" return False As you can see, I'm trying to use the function over() to stop my while loop. Currently, when my time stop, over is returned

问题 I have added to my explanation a bit. Conceptually, I am running a script that processes in a loop, calling shells that use the line content as an input parameter.(FYI: a kicks off an execution and b monitors that execution) I am needing 1a and 1b to run first, in paralell for the first two $param Next, 2a and 2b need to run in serial for $params when step 1 is complete 3a and 3b will kick off once 2a and 2b are complete (irrelevant if serial or parallel) Loop continues with next 2 lines from

问题 I wrote a simple parser for a .txt file with the following instructions: my $file2 = "test.txt"; open ($process, "<",$file2) or die "couldn't manage to open the file:$file2!"; while (<$process>) { ... } In some files that I am trying to parse there is a special character that is like the right arrow (->) and that I don't manage to paste here from the file. Every time the parser hits that character (->), it exits the file without processing it till the end. Is there a way to avoid it and

问题 A GPA, or Grade point Average, is calculated by summing the grade points earned in a student’s courses and then dividing by the total units. The grade points for an individual course are calculated by multiplying the units for that course by the appropriate factor depending upon the grade received: A receives 4 grade points B receives 3 grade points C receives 2 grade points D receives 1 grade point F receives 0 grade point Your program will have a while loop to calculate multiple GPAs and a

问题 I would like to write a loop that checks the value of a variable has changed. There's no event that fires to tell me the value has changed. The application doesn't support multi threading. How to achieve this without causing app to freeze ? The aim is this: Application starts ... loop Check variable value If changed then exit if timedOut then exit While loop causes application to freeze. Thank you. * Edit * This is what I'm after (this code is written by Remy Lebeau): const APPWM_COM_EVENT

问题 I have some code which asks the user to guess the answer to a calculation, and then either tells them they are correct or tries to identify where they went wrong. I have used a while loop in this but sometimes it gets stuck, is there a way to add a counter to the guesses taken, and to break the while loop after 5 incorrect guesses? 回答1: In general it should look like this: i = 0 while i < max_guesses: i+=1 # here is your code 回答2: Just create a variable to store incorrect guesses and use a if

问题 I have a script that read log files and parse the data to insert them to mysql table.. My script looks like while read x;do var=$(echo ${x}|cut -d+ -f1) var2=$(echo ${x}|cut -d_ -f3) ... echo "$var,$var2,.." >> mysql.infile done<logfile The Problem is that log files are thousands of lines and taking hours.... I read that awk is better, I tried, but don't know the syntax to parse the variables... EDIT: inputs are structure firewall logs so they are pretty large files like @timestamp $HOST