What is happening in this while loop

Question

prasanna 2013-10-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/104086-what-is-happening-in-this-while-loop

评论： Image Analyst 2013-10-28

this is a peice of code written in matlab.

while(flag==1)
flag=0; 
disp('end of loop'); 
end

surprisingly, this does not display the string and if i remove disp statement and figure1 window appears. can anyone explain why?

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

Andreas Justin 2013-10-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/104086-what-is-happening-in-this-while-loop#answer_113434

在 MATLAB Online 中打开

flag = true
while flag
  flag=0;
  disp('end of loop'); 
end

see: doc flag

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Image Analyst 2013-10-28

I bet a lot of people don't know flag is the name of a built-in function - I didn't. So it's best to use some other name instead of flag, like keepLooping, or keepGoing, or something. And your point of initializing flag prior to entering the loop is really the key issue here (because you could actually overwrite the flag function with your own variable of the same name if you wanted to, though it's not advised).

请先登录，再进行评论。