while Loop on user input

Hi i am new for Matlab may i know to create a loop function when user input ?

purchase type L for Laptop and D for Desktop
if user input L or D 
    will disply Laptop or ether Desktop depent on input
    if user input invild data will show invild input and loop to puchase type ask for input puchase type again
        
        purchase_type = input("Enter type of purchase (L for Laptop / D for Desktop): ", "s");
        
        if purchase_type >= ("L for laptop , D for Desktop ");
            
        else
            purchase_type = "invalid";
        end
        
        if strcmp(purchase_type, "invalid") == false
            fprintf("Invalid type of puchase_type! %s\n");    
        else
            fprintf input = ("Enter type of purchase (L for Laptop / D for Desktop) %s\n"});
        end

Answer 1

[ag]

Hi Fushen,

Below is a modified version of your code:

% Initialize the purchase_type variable
purchase_type = '';

% Loop until a valid input is received
while true
    % Prompt for user input
    purchase_type = input("Enter type of purchase (L for Laptop / D for Desktop): ", "s");
    
    % Check if the input is valid
    if strcmpi(purchase_type, 'L')
        fprintf("You selected: Laptop\n");
        break; % Exit the loop
    % similar logic for other case
    else
        fprintf("Invalid input!");
    end
end

For more details, please refer to the following MathWorks documentations:

• input - https://www.mathworks.com/help/matlab/ref/input.html
• strcmpi - https://www.mathworks.com/help/matlab/ref/strcmpi.html
• while loop - https://www.mathworks.com/help/ecoder/ug/while-loop.html

Hope this helps!