What is the difference between " while 1" and "while true", Should I use one over the other?

Question

NeGM 2022-7-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1767645-what-is-the-difference-between-while-1-and-while-true-should-i-use-one-over-the-other

编辑： James Tursa 2022-7-26

I'd like to know the difference between while 1 and while true and in which cases I should use one over the other. Thank you

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

James Tursa 2022-7-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1767645-what-is-the-difference-between-while-1-and-while-true-should-i-use-one-over-the-other#answer_1014870

编辑：James Tursa 2022-7-26

1 is a double class scalar and true is a logical class scalar, so the check for "non-zero" is slightly different for each even though they both accomplish the same thing. For all we know the parser might even optimize this away into a simple GOTO at the end of the loop. But since you are using the value in a logical context, using true probably makes more sense. I suppose checking a 1-byte integer value in the background (logical) might be ever so slightly faster than checking an 8-byte floating point value in the background (double) also, although for an interpreted language like MATLAB I doubt you could tell the difference in timing.