How to ask the user to check avalue from a loop

I have this loop

For i= 1:30 
s=a*x(i);
if s>=0
cc(i)=1;
else cc(i)=0;
end 
end

I want the user to select a number between 1:30 and check if it is equal to 1 or 0 and state that for 0 it is normal and for 1 it is not

[Guillaume]

I want ...

While I understand what you ask I completely fail to see how it relates to your loop. What is the link?

[Ahmed Alshehhi]

I may not explain my equation corectly . I dont know how to let the user to enter a number and check it base on the loop result

Answer 1

[David Fletcher]

I'm not entirely sure I understand what you are trying to do, but if you just want to get basic input from the user then see the docs on the input function.