while Loop on user input

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fushen Lee
fushen Lee 2021-2-3
编辑： Walter Roberson 2025-3-12，18:11
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

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回答（1 个）

ag
ag 2025-3-12，18:01
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:
Hope this helps!

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