how can I keep the user to input a value that is devisable by 7

hello,

I think the answer to this is very simple. the code that I am trying to do is to keep asking for a number that is divisable by 7. once the user enters a number that is div by 7, the code ends. I got the part where the user input is div by 7 and ends, but I cant find a way to keep asking for input if the number is not div by 7. here is what I got.

usernum = input('enter a posative number: ');
i = 1;
deviby7 = rem(usernum, 7);
while  i > 0 
    if deviby7 ~= 0
        fprintf('incorrect input\n')       
    elseif deviby7 == 0
        fprintf('correct input\n')  
         i = i -1;
    end
end  

Answer 1

[madhan ravi]

while  1
    usernum = input('enter a positive number: ');
    deviby7 = rem(usernum, 7);
    if  ~deviby7
        fprintf('correct input\n')
        break
    else
        fprintf('incorrect input\n')
    end
end

[Stephen23]

Nice and simple. Here also without the temporary variable:

while true
    usernum = input('enter a positive number: ');
    if rem(usernum, 7)
        fprintf('incorrect input\n')
    else
        fprintf('correct input\n')
        break
    end
end

[madhan ravi]

Very true, thank you Stephen.

[madhan ravi]

If you had run the code you won’t be asking this question.