Add code to have switch repeat if a case is not met

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Bryce McCord
Bryce McCord 2022-9-21
回答： Eric Sofen 2022-9-21
fprintf('Difficulty level: \nEasy: [0, 10] \nMedium: [0, 50] \nHard: [0, 100] \n'); % Print statement outputting different difficulties
diff_level = input('Choose difficulty level: ', 's'); % user input for which difficulty desired, 's' is present since input is string
numplayer = input('How many players: '); % user input for number of players
leaderboard = cell(numplayer,2); % Stores result of guesses
switch diff_level % Switch case to assign difficulties with ranges
case 'Easy'
max_number = 10;
case'easy'
max_number = 10;
case'EASY'
max_number = 10;
case 'Medium'
max_number = 50;
case'medium'
max_number = 50;
case'MEDIUM'
max_number = 50;
case 'Hard'
max_number = 100;
case'hard'
max_number = 100;
case'HARD'
max_number = 100;
otherwise
disp('Difficulty not available.')
end
for player = 1:numplayer
number_of_attempt = 1;
rng('shuffle') % Random number generator seeded to time
number_to_guess = randi([0, max_number]); % Creates random # from 0 to max number set by difficulty
fprintf('\nPlayer Ready\n')
player_guess = input('Take a guess: ');
while player_guess ~= number_to_guess % While loop to run untill correct # is guessed
if player_guess < number_to_guess % if statement for low guess
disp('Too low! guess again:')
end
if player_guess > number_to_guess % If statement for high guess
disp('Too high! guess again:')
end
number_of_attempt = number_of_attempt + 1;
player_guess = input('Take a guess: ');
end
leaderboard{player, 1} = number_of_attempt; % adds # of guesses to leaderboard
leaderboard{player, 2} = input('Enter player name: ', 's'); % assigns name to that persons attempt
end
leaderboard = sortrows(leaderboard,1); % sort the table
position = 0;
fprintf('-----------------------------RESULTS--------------------------------\n')
for player = 1:numplayer
position = player;
if player > 1 % reduce position for draw
if leaderboard{player, 1} == leaderboard{player-1, 1} % Orders playes by guesses
position = position - 1;
end
end
fprintf('%d place %s with %d attempts. \n', position, leaderboard{player,2}, leaderboard{player,1}) % print statement to output order of players
end
When a case isnt met the code ends and has an error. How can I instead have the code continue to run and repeat the switch if a case isn't met?

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回答（3 个）

Steven Lord
Steven Lord 2022-9-21
Ran in:
You can simplify your switch call so you don't have to include 2^(number of letters) cases each with a different combination of cases. The lower function converts text into all lower case.
E = 'EaSY';
switch lower(E)
case 'easy'
disp('Easy case selected')
case 'medium'
disp('Medium case selected')
otherwise
disp('No match')
end
Easy case selected
What happens if I remove the lower call?
E = 'EaSY';
switch E
case 'easy'
disp('Easy case selected')
case 'medium'
disp('Medium case selected')
otherwise
disp('No match')
end
No match
I'd probably assign max_number some easily detected "invalid" value and wrap your switch call in a while loop that tests if max_number is still in that invalid state.
N = NaN;
while isnan(N)
x = randi(10); % Random integer between 1 and 10
fprintf("Generated %d.\n", x)
if x >= 9
N = x; % Break out of the loop as soon as 9 or 10 is generated
end
end
Generated 7. Generated 1. Generated 7. Generated 9.
disp(N)
9
While I used randi to generate the data that decides whether or not to exit the while loop you could call input and switch.
Jan
Jan 2022-9-21
编辑：Jan 2022-9-21
knownLevels = {'easy', 'medium', 'hard'};
Levels = [10, 50, 100];
fprintf('\nChoose one of the known levels: %s\n', strjoin(knownLevels, ', '));
max_number = 0;
while max_number == 0
diff_level = input('Choose difficulty level: ', 's');
match = strcmpi(diff_level, knownLevels);
if any(match)
max_number = Levels(match);
else
fprintf('\nChoose one of the known levels: %s\n', strjoin(knownLevels));
end
end
Eric Sofen
Eric Sofen 2022-9-21
A while loop is one way to accomplish this. Also note that you can use lower() to reduce the number of cases.
max_number = nan;
while isnan(max_number)
fprintf('Difficulty level: \nEasy: [0, 10] \nMedium: [0, 50] \nHard: [0, 100] \n'); % Print statement outputting different difficulties
diff_level = input('Choose difficulty level: ', 's'); % user input for which difficulty desired, 's' is present since input is string
numplayer = input('How many players: '); % user input for number of players
switch lower(diff_level) % Switch case to assign difficulties with ranges
case'easy'
max_number = 10;
case'medium'
max_number = 50;
case'hard'
max_number = 100;
otherwise
disp('Difficulty not available. Please specify game parameters again')
% don't set max_number
end
end
% ...

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