How to create multiple conditions for invalid inputs?

Question

RealA 2019-4-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458164-how-to-create-multiple-conditions-for-invalid-inputs

评论： Rena Berman 2019-5-15

Hey everyone, I'm currently building a unit converter program for an assignment and I'm struggling to create a loop that repeats a certain message if certain conditions are not met. For example if I were to leave x blank and spam enter it would repeat the message which is want I want. However if I were to enter a value that is below 0 or above 10 , and then leave x blank and press enter, I would get an error(red line), in this instance I would like my code to reapeat the isempty(x) loop. How would I achieve this?

Thanks in advance

x=input(' enter a number from the selection above: ');
while isempty(x)
       disp('You are required to enter a number from the options above!')
        x=input(' enter a number from the selection above: ');
        
 end
 
 while(x<=0 || x>=10)
    disp('The number must be between 1 and 9, you have enterd a value oustide the limit')
        x=input(' enter a number from the selection above: ');
      
 end

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Rena Berman 2019-5-15

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Answer 1

Walter Roberson 2019-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/458164-how-to-create-multiple-conditions-for-invalid-inputs#answer_371979

在 MATLAB Online 中打开

while ~isscalar(x) || x <= 0 || x >= 10

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RealA 2019-4-24

Thanks for the response, just one thing though if I were enter a value that is below 0 or above 10 and leave the input blank and press enter, I would like my code to also run the same display message as the isempty loop. How could I do that?

Walter Roberson 2019-4-24

在 MATLAB Online 中打开

prompt = ' enter a number from the options above: ';
x = input(prompt);
while ~isscalar(x) || x <= 0 || x >= 10
    disp('You are required to enter a number from the options above!');
    x = input(prompt);
end