while-loop

I can run a piece of code for 5 or 10 seconds using the following code: period <- 10 ## minimum time (in seconds) that the loop should run for tm <- Sys.time() ## starting data & time while(Sys.time() - tm < period) print(Sys.time()) The code runs just fine for 5 or 10 seconds. But when I replace the period value by 60 for it to run for a minute, the code never stops. What is wrong? As soon as elapsed time exceeds 1 minute, the default unit changes from seconds to minutes. So you want to control the unit: while (difftime(Sys.time(), tm, units = "secs")[[1]] < period) From ?difftime If ‘units =

When I use an Iterator of Object I use a while loop (as written in every book learning Java, as Thinking in Java of Bruce Eckel): Iterator it=... while(it.hasNext()){ //... } but sometime i saw than instead somebody use the for loop : Iterator it=... for (Iterator it=...; it.hasNext();){ //... } I don't' understand this choice: I use the for loop when I have a collection with ordinal sequence (as array) or with a special rule for the step (declared generally as a simple increment counter++ ). I use the while loop when the loop finishes with I have'nt this constraints but only a logic condition

I have mvc action method where while loop is running I want to stop that while loop on another button click so I have maintain a flag and set it to false to break loop. bool flag = true; public async Demo() { while(flag == true) { do something... } } now on button click I'm calling one action method to stop the while loop - public ActionResult StopLoop() { flag = false; Return View("Index") } But it is taking almost a minute time to hit this StopLoop after click on button. why ? may be all are on same UI page and sharing same homecontroller any trick i can do ? i have 2 buttons on one button

I am attempting to write a loop that will repeat until the user enters one of the correct choices (either 1 or 0). For some reason when I have the loop written as below it creates an infinite loop. I am intending for the loop to only execute while control is not 0 OR not 1, but for some reason it will always execute and becomes an infinite loop. cout<<"Please enter 1 for another customer or 0 to quit : "; cin>>control; while ((control != 0 )|| (control != 1)) { cout<<"Invalid Entry! Please enter a 1 to enter another customer or 0 to quit: "; cin>>control; } I changed it to be while control

Correct me if I'm wrong, but when I try to update my label in a while loop it won't update it. Is the reason that the while loop runs too quickly for the label to update within that time so it'll cancel the label from updating? I need a solution to this? I need to be able to update the label straight away? func Download(complete: (canMoveOn: Bool) -> Void) { isDownload = true if (connected!) { Reset() let data = NSData(contentsOfFile: path!)! let buffer = (UnsafeMutablePointer<UInt8>(data.bytes)) var leftOverSize = data.length let bytesFile = data.length var totalBytesRead = 0 var bytesRead =