Program generates random number. User has to guess it from 3 times.

Question

Ryan 2013-12-21

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评论： Ryan 2013-12-22

guessing_game_two.m

I've written a matlab program that generates a random integer between 1 and 10 and the user has to guess it. The user has 3 shots at guessing the number. The program worked but I tried modifying it so it shows the number of guesses that the user has left. Line 11 gives me an error I have no ideea why. I have attached the program here is the code from it:

% program generates a random number between 1 and 10
% user has to guess it from 3 tries
nr = randi([1,10]);
i = 0;
choice = input('Guess the number(you have 3 shots): ');
while choice ~= nr
    i = i+1;
    if i<3
        % choice = input('You have %d more tries! ', i);
    else
        fprintf ('You blew it! The number was %d\n', nr)
        break
    end
end
if choice == nr
    fprintf('Congratulations, you guessed the number %d!\n', nr)
end

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John D'Errico 2013-12-21

It looks to be time to read the help for input. What does it expect the second argument to be?

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Answer 1

Walter Roberson 2013-12-21

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在 MATLAB Online 中打开

choice = input(sprintf('You have %d more tries! ', i));

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Ryan 2013-12-22

Thank you but now I have another problem it shows from 3 to 1. So if the user guesses wrong the program returns 'You have 1 more tries' then if user guesses wrong again the program says 'You have 2 more tries'. It's basically the way around. Any ideea how could I fix this?

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Answer 2

Suneesh 2013-12-21

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1. When the person guess the correct number, in the ELSE part you do not do anything about the variable 'i'. Due to this the answer is guess right and the WHILE loop runs infinitely. Ideally you should get out of the loop when the answer is guess correctly.

2. Also, the user gets 4 chances to guess not 3. Once chance on line number 3 and three more chances in the loop

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Ryan 2013-12-22

Thank you for your answer. Correct me if I'm wrong but the if from the loop is: if i<3 not i<=3 and i starts from 0 so wouldn't it be 3 chances(i=0, i=1 and i=2)? It works for me just fine with 3 chances.

Walter Roberson 2013-12-22

sprintf("You have %d more tries",i) is going to be giving the wrong output if you have i counting upwards. "You have 1 more tries" should only be before "You have 2 more tries" in the case of very large values of "1".

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