While loop question, one too many loops happens.

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Dan Po
Dan Po 2016-10-11
回答： Dan Po 2016-10-15
I want the counter to stop counting once the value '1' is entered. If '1' is entered when running this script, the while loop runs once more before ending. I do not want this. Am I using break the wrong way, or is something else happening?
Thanks
counter=0;
y_n=0;
while y_n==0
if y_n==1
break
end
counter=counter+1
y_n= input('enter 1 or 0\n')
end

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采纳的回答

Walter Roberson
Walter Roberson 2016-10-11
You just tested that y_n == 0 in the while statement. It cannot have changed value by the very next statement, at which point you test whether y_n==1 . You should move the "if" to after the input() .
Question: What do you want to have happen if the user enters (for example) 2.134473 ? That is not 0 so the while condition will no longer be true, but the if y_n==1 would be false.
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Dan Po
Dan Po 2016-10-11
编辑：Dan Po 2016-10-11
The matlab online app works as I want, but I will check if my desktop version runs correctly. I was using a live script and was not getting my wanted output. Thank you for your help.
format compact
clear
clc
counter=0;
y_n=0;
while y_n==0
y_n= input('enter 1 or 0 to continue or end the loop \n');
if y_n==1
break
end
counter=counter+1;
fprintf('this is loop %d\n',counter)
end
fprintf('the final count of loops is %d\n',counter)

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更多回答（1 个）

Dan Po
Dan Po 2016-10-15
Could someone refer me to a place that tells how to qualify inputs?

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