while-loop

I'm frequently using the do-while-checkNextForNull-getNext looping pattern (don't know if there is an official name for it) in some of my projects. But in Java8, the use of Optional is considered as cleaner code than checking for null references in client-code. But when using Optional in this looping pattern, the code gets a bit verbose and ugly, but because Optional has some handy methodS, I would expect that there must exist a cleaner way than the one I came up with below. Example: Given the following class. class Item { int nr; Item(nr) { this.nr = nr; // an expensive operation } Item next(

I've seen two ways to create an infinite loop in Python: while 1: do_something() while True: do_something() Is there any difference between these? Is one more pythonic than the other? Fundamentally it doesn't matter, such minutiae doesn't really affect whether something is 'pythonic' or not. If you're interested in trivia however, there are some differences. The builtin boolean type didn't exist till Python 2.3 so code that was intended to run on ancient versions tends to use the while 1: form. You'll see it in the standard library, for instance. The True and False builtins are not reserved

Can we put semicolon like while(condition); in a C Programming? If while(condition); is valid, what does it mean? while (condition); is the same as while (condition) { } It can be used for waiting loops, e.g.: while (!isLightGreen()); // waits until isLightGreen() returns true go(); It means the body of the loop is empty. Typically this pattern is used when the condition itself does some work. For example, this loop can copy bytes within the condition: while ( '\0' != (*pt++ = *ps++)) ; If you're using a semicolon, it's a good idea to put it on a separate line so that it looks less like a

I was doing some small programs in java. I know that if I write while(true); the program will freeze in this loop . If the code is like that: Test 1: public class While { public static void main(String[] args) { System.out.println("start"); while (true); System.out.println("end"); } } The compiler throws me the error: Exception in thread "main" java.lang.Error: Unresolved compilation problem: Unreachable code at While.main(While.java:6) I didn't know that this error exists. But I got why it is thrown. Of course, line 6 was unreachable , causing a compilation problem. Then I tested this: Test 2