How can I get a user to input a number which is not already

Question

Pheamwat 2023-4-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1951408-how-can-i-get-a-user-to-input-a-number-which-is-not-already

回答： Rik 2023-4-22

Hi, I just want a user to input(input must be between 1-9) a new number, so store the input value in a vector and add every new input to that vector and every time the user input new number I just use a code to check is the input is already in the vector, but my code is not check every value in the vector.

o=[];
for i=1:4
    num=input('Enter:');
    while num<=0||num>=9
        num=input('Enter exist number:');
    end
    for i=1:length(o)
        if num==o(i)
            while num==o(i)
                num=input('Enter new:');
            end
        end
    end
    o=[o num];
end

This is my code, can anyone please help

Thanks,

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Answer 1

Rik 2023-4-22

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1951408-how-can-i-get-a-user-to-input-a-number-which-is-not-already#answer_1220983

What you need to do, is to put your input statement at the start of the while loop, and then you can use ismember instead of a loop to check for matches.

Note that you should ask the user for the number in a char vector, and then use str2double to convert the char to a number.

The bottom line is that you should split the tasks of asking the user for a number and validating that input. You should write it in such a way that you can put those things in separate functions.