Hi Samia,
You can follow two approaches here but the overall steps remain the same. We can initialize an empty data structure to store the characters. Then we obtain the input from the user using the input function. We check the data structure for the input and proceed with the code.
Approach 1: Using while loop and array as suggested by you
storedChars = [];
while true
newChar = input('Enter a character: ', 's');
% Check if the character is already in the array
if any(storedChars == newChar)
disp('Character already entered.');
else
% Add the new character to the array
storedChars = [storedChars, newChar];
switch newChar
% Your code
end
end
end
Approach 2: Using isKey and container.Map
storedChars = containers.Map('KeyType', 'char', 'ValueType', 'logical');
while true
newChar = input('Enter a character: ', 's');
% Check if the character is already in the map
if isKey(storedChars, newChar)
disp('Character already entered.');
else
% Add the new character to the map
storedChars(newChar) = true;
switch newChar
% Your code
end
end
end
Please refer the following documentation to read more about these:
- input: https://www.mathworks.com/help/matlab/ref/input.html
- containers.Map: https://www.mathworks.com/help/matlab/ref/containers.map.html
- isKey: https://www.mathworks.com/help/matlab/ref/containers.map.iskey.html
Hope this helps!
