The short answer is no. You would generally use some higher-order function to express the same functionality. There is a number of functions that let you do this, corresponding to different patterns (so if you describe what exactly you need, someone might give you a better answer). For example, tryFind function returns the first value … Read more
These are the reasons I would choose one over the other: For-loop Syntax: for( int i = 0; i < 10; i++) { //Some code here } I would use a for loop for the reason that I may KNOW the NUMBER OF ITERATIONS I need to do and I have an INCREMENTING variable which … Read more
2020 answer: Since Python 3.8, the “walrus operator” := exists that does exactly what you want: while data := fgetcsv(fh, 1000, “,”) != False: pass (if that fgetcsv function existed) 2013 answer: You can’t do that in Python, no assignment in expressions. At least that means you won’t accidentally type == instead of = or … Read more
You need to put the standard input in non-blocking mode. Here is an example that works: #!/bin/bash if [ -t 0 ]; then SAVED_STTY=”`stty –save`” stty -echo -icanon -icrnl time 0 min 0 fi count=0 keypress=”” while [ “x$keypress” = “x” ]; do let count+=1 echo -ne $count’\r’ keypress=”`cat -v`” done if [ -t 0 … Read more
Error Message: Exception in thread “main” java.lang.NumberFormatException: For input string: “Ace of Clubs” at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.lang.Integer.parseInt(Integer.java:580) at java.lang.Integer.parseInt(Integer.java:615) at set07102.Cards.main(Cards.java:68) C:\Users\qasim\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1 means: There was an error. We try to give you as much information as possible It was an Exception in main thread. It’s called NumberFormatException and has occurred for input … Read more
In your example break statement will take you out of while(b) loop while(a) { while(b) { if(b == 10) { break; } } // break will take you here. }
This is effectively a Do-While loop: WHILE (1=1) BEGIN — Do stuff… IF (some_condition is true) BREAK; END But as @Joel Coehoorn noted, always try to use a set based approach first. I would only resort to a loop if I can’t think of a way to solve using set operations.
There are three things that might be suspicious for you if you are a C++ beginner: First thing might be operator /=, which combines an integral division (i.e. without remainder), with an assignment. So x /= 10 actually is the same as x = x / 10. Second, each expression in C++ has – after … Read more
An assignment expression has type Unit in Scala. That is the reason for your compiler warning. There is a nice idiom in Scala that avoids the while loop: val iterator = Iterator.continually(reader.readNext()).takeWhile(_ != null) This gives you an iterator over whatever reader.readNext returns. The continually method returns an “infinite” iterator and takeWhile takes the prefix … Read more
Not at all – I believe you’ll find do-nothing loops like these in K&R, so that’s about as official as it gets. It’s a matter of personal preference, but I prefer my do-nothing loops like this: while(something()); Others prefer the semicolon to go on a separate line, to reinforce the fact that it’s a loop: … Read more