My while loop and rem function create an infinite loop

Question

Krista Clark 2021-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/758229-my-while-loop-and-rem-function-create-an-infinite-loop

评论： Krista Clark 2021-2-28

I have to use a while loop to ensure user input is an integer between 3 and 50. I set up constraints to do this but once I use the rem function to flag for noninteger it runs and infinite loop for my fprintf. What am I doing wrong?

%get user input
prompt = ('Enter a number for the length of your array: ');
x = input(prompt);
%have user input be an integer between 3-50 
%test for noninteger
while (x < 3 || x > 50 || rem(x,1) ~= 0)
    fprintf('Please enter an integer between 3 and 50: ');
end

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Answer 1

Walter Roberson 2021-2-27

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You do give a chance for the user to enter x again, so you are testing the same x each time.

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Walter Roberson 2021-2-28

在 MATLAB Online 中打开

%get user input
prompt = ('Enter a number for the length of your array: ');
x = input(prompt);
%have user input be an integer between 3-50 
%test for noninteger
while (x < 3 || x > 50 || rem(x,1) ~= 0)
    fprintf('Please enter an integer between 3 and 50: ');
    x = input(prompt);
end