Validating a String Using a While Loop

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Michael Doherty
Michael Doherty 2016-10-9
回答： Walter Roberson 2016-10-9
I'm stuck in what seems to be an infinite loop while trying to validate an input string. Even if I enter V or C it still displays the "error".
% INPUT user choice for calculating voltage or current
choice = input('\nPlease enter V to calculate volts or C to calculate current: ', 's');
% TEST if user entered V or C
while choice ~= 'v' || choice ~= 'V' || choice ~= 'c' || choice ~= 'C'
choice = input('ERROR! Please enter either V or C: ', 's');
end
I'm relatively new to MATLAB so I apologize in advance if it is messy or not the most efficient way to do this. Any ideas or suggestions?

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采纳的回答

Walter Roberson
Walter Roberson 2016-10-9
while ~ismember(choice, 'vcVC')
choice = input('ERROR! Please enter either V or C: ', 's');
end
Or
while choice ~= 'v' && choice ~= 'V' && choice ~= 'c' && choice ~= 'C'
choice = input('ERROR! Please enter either V or C: ', 's');
end
or
while ~(choice == 'v' || choice == 'V' || choice == 'c' || choice == 'C')
choice = input('ERROR! Please enter either V or C: ', 's');
end

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