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?

Question

Richard 2024-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/2086768-how-do-i-get-my-matlab-code-to-display-an-error-if-the-user-input-number-is-less-than-four-digits-an

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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Answer 1

Walter Roberson 2024-2-26

在 MATLAB Online 中打开

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.

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Richard 2024-2-26

Thank you!

Is there a way to do it with a number with leading zeros?

Walter Roberson 2024-2-26

编辑：Walter Roberson 2024-2-26

在 MATLAB Online 中打开

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