Check input is a string or Char if so reprompt

Question

Methat 2024-5-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2115271-check-input-is-a-string-or-char-if-so-reprompt

评论： Methat 2024-5-6

I am struggling to fidn a way to check a input if its any type of string or char and if so reprompt the user.

Code is below:

a = input("Please enter a number: "); %Takes user input for number that is to be converted
while isempty(a)
    disp('Invalid input please enter a number!')
    a = input("Please enter a number: ");
end
convtype = input("Please enter the conversion type: "); %Takes user input for the cnversion type that they want
while isempty(convtype)|| convtype < 1 || convtype > 14
    disp('Invalid conversion type selection please make a selection between 1 and 14!')
    convtype = input("Please enter the conversion type: ");
end

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Stephen23 2024-5-5

在 MATLAB Online 中打开

If you specify the 's' option then INPUT will always return a character vector:

txt = input(prompt,'s')

Methat 2024-5-6

so it will return that value as a charecter lets say I need to use that value later for a calculation I would need to convert it back to a numerical input. Also if I were to do this would I use ischar() to check if its charecter to ten reprompt the user to re-enter their value?

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Answer 1

Walter Roberson 2024-5-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2115271-check-input-is-a-string-or-char-if-so-reprompt#answer_1452636

在 MATLAB Online 中打开

a = input("Please enter a number: "); %Takes user input for number that is to be converted
while ~isnumeric(a) || numel(a) ~= 1
    disp('Invalid input please enter a number!')
    a = input("Please enter a number: ");
end
convtype = input("Please enter the conversion type, integer 1 to 14: "); %Takes user input for the cnversion type that they want
while ~isnumeric(convtype) || numel(convtype) ~= 1 || convtype ~= floor(convtype) || convtype < 1 || convtype > 14
    disp('Invalid conversion type selection please make a selection between 1 and 14!')
    convtype = input("Please enter the conversion type as an integer 1 to 14: ");
end