How do I get my MATLAB code to display an error if the user input number is less than four digits and has less than two distinct numbers?

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Richard
Richard 2024-2-26
编辑： Walter Roberson 2024-2-26
clear
clc
constant = 6174; % Initialize end condition of while loop
steps = 0; % Initialize steps in a loop
user = input('Please enter a 4 digit number: ') % User inputs a number
digits = num2str(user);
if numel(num2str(user)) < 4 && length(unique(digits)) < 2{
disp("Error. Not a valid number. Enter a four digit number with at least two distinct numbers")
}
end

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Walter Roberson
Walter Roberson 2024-2-26
user = input('Please enter a 4 digit number: ') % User inputs a number
digits = num2str(user);
if numel(digits) < 4 || length(unique(digits)) < 2
error("Error. Not a valid number. Enter a four digit number with at least two distinct numbers");
end
However, you have problems if the user inputs a number starting with 0.
  2 个评论
Walter Roberson
Walter Roberson 2024-2-26
编辑：Walter Roberson 2024-2-26
digits = input('Please enter a 4 digit number: ', 's'); % User inputs a number
if numel(digits) ~= 4 || length(unique(digits)) < 2 || ~all(isstrprop(digits, 'digit'))
error("Error. Not a valid number. Enter a four digit number with at least two distinct numbers");
end

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