Why doesn't my code recognize the input function in the loop?

Question

Xena Erzi 2021-11-13

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评论： Xena Erzi 2021-11-14

采纳的回答： Image Analyst

Dear community,

I am having issues with my following code:

% User is asked to enter numbers. Once they enter a 0, the amount of numbers entered prior is being displayed.

for i = n

numbers = input("Please enter a number: ")

if numbers~=0

input("Please enter a number: ")

else

fprintf("You entered %d numbers. ", length(numbers))

end

The print statement works, as long as I just have entered 0. But if there are more than two entries, nothing happens? Did I put in the input function at an inappropiate place? I am not sure what causes this to not put the input function "as a loop", as long as the entered number is not 0.

Kind regards,

Xena

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Answer 1

Image Analyst 2021-11-13

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Try it this way:

% User is asked to enter numbers. Once they enter a 0, the amount of numbers entered prior is being displayed.
n = 9; % Whatever the maximum times you want to ask is.
count = 0;
for k = 1 : n
    usersResponseS = input('Please enter a number: ', 's');
    usersResponse = str2double(usersResponseS);
    if isnan(usersResponse)
        fprintf('%s is not a valid response.  Enter a number, not a letter.\n', usersResponseS)
    elseif usersResponse ~=0
        % Increment count of valid numbers.
        count = count + 1;
        % Log this valid number to an array.
        numbers(count) = usersResponse;
        % fprintf("You have entered %d valid numbers.\n", count);
    else
        fprintf("You have entered %d valid numbers.\n", count);
        break;
    end
end

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Xena Erzi 2021-11-14

Thank you!

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Answer 2

Awais Saeed 2021-11-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1585739-why-doesn-t-my-code-recognize-the-input-function-in-the-loop#answer_830649

编辑：Awais Saeed 2021-11-13

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try this

ctr = 0;
for i = 1:1:3
    numbers = input('Enter a number: ');
    if numbers ~= 0
        ctr = ctr + 1;
    else
        fprintf('You have entered %d valid numbers\n', ctr)
        break;
    end
end

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Image Analyst 2021-11-13

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Huh?

for i = 1:1:3
    numbers = input('Enter a number: ');
    if numbers ~= 0
        disp('invalid entry')
    else
        fprintf('You have entered %d\n', numbers)
    end
end

is working for you? You might want to verify that.

Awais Saeed 2021-11-13

Seems I misunderstood the requirement. I thought the OP is asking for to say "invalid" for non-zero input and "valid" for 0 input. Anyways, I have updated the code.

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