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- Dictionarywhile/wʌɪl/
noun
- 1. a period of time: "we chatted for a while"
- 2. at the same time; meanwhile: "he starts to draw, talking the while"
conjunction
- 1. during the time that; at the same time as: "nothing much changed while he was away"
- 2. whereas (indicating a contrast): "one person wants out, while the other wants the relationship to continue"
relative
- 1. during which: "the period while the animal remains alive"
verb
- 1. pass time in a leisurely manner: "a diversion to while away the long afternoons"
preposition
- 1. until: Northern English "father will be happy while dinner time"
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Sep 2, 2010 · 0. The most important difference between while and do-while loop is that in do-while, the block of code is executed at least once, even though the condition given is false. To put it in a different way : While- your condition is at the begin of the loop block, and makes possible to never enter the loop.
Dec 27, 2022 · 1. For loops are used when you want to do operations on each member of a sequence, in order. While loops are used when you need to: operate on the elements out-of-order, access / operate on multiple elements simultaneously, or loop until some condition changes from True to False. – apraetor.
Oct 15, 2019 · @Kirk - In part, I agree ,but the alternatives aren't much better. Ideally, the class you're using implements a generator and you can just use a for loop, but there are certain cases where you need a while loop ( e.g., 'while cur_time>expected_time:'). I don't know if the OPs post is much better, but I suppose its a matter of opinion :) –
Jun 18, 2014 · 157) This is intended to allow compiler transformations such as removal of empty loops even when termination cannot be proven. This means while(1); can be assumed to terminate in C++11 but not in C11. Even with that, note 157 (not binding) is interpreted by some vendors as allowing them to remove that empty loop.
Apr 22, 2010 · The do while is a common convention which makes the macro require a trailing semi colon like a standard c function would. Other than that it just ensures the variable that has been freed is set to NULL so that any future calls to free it will not cause errors.
Mar 30, 2015 · If function1() is actually a macro, just using { } requires you to omit the semicolon at the point of use, but do { } while(0) lets you use exactly the same syntax as for a real function. (Not using any kind of block construct at all would just generate completely broken code, natch)
Nov 28, 2015 · Using #define in a while loop. Ask Question Asked 13 years, 4 months ago. Modified 8 years, 9 months ago.
Feb 13, 2020 · 137. while True means loop forever. The while statement takes an expression and executes the loop body while the expression evaluates to (boolean) "true". True always evaluates to boolean "true" and thus executes the loop body indefinitely. It's an idiom that you'll just get used to eventually!
This will compile and work as expected, but this is not uniform. The more elegant solution is to make sure that macro expand into a regular statement, not into a compound one. One way to achieve that is to define the macro as follows: #define CALL_FUNCS(x) \ do { \ func1(x); \ func2(x); \ func3(x); \ } while (0) Now this code:
Generically, do / while is good for any sort of loop construct where one must execute the loop at least once. It is possible to emulate this sort of looping through either a straight while or even a for loop, but often the result is a little less elegant. I'll admit that specific applications of this pattern are fairly rare, but they do exist.
