What's wrong in it?

Write a function called smallest_multiple that returns a uint64, the smallest positive number that is evenly divisible by all of the numbers from 1 to n where n is a positive integer scalar and is the only input argument of the function. If the result would be greater than what can be represented as a uint64, the function returns 0.

function LCM=smallest_multiple(n)
    %
    x=(1:1:n);
    r=1;
    i=1;
    while(i<=length(x))
        r=(lcm(r,x(i)));
        i=i+1;
    end
    if(r>intmax('uint64'))
        LCM=uint64(0);
    else
        LCM=uint64(r);
    end
end

GIVING ERROR FOR INPUT 45 .

[per isakson]

I cannot reproduce the error on R2016a 64bit.

LCM=smallest_multiple(45)

returns

Warning: Inputs contain values larger than the largest consecutive flint.
         Result may be inaccurate. 
...
LCM =
                    0

[ES]

What is your error? Is it about memory? What MATLAB version do you use? I have tried your script in R2014B-64 bit. It works well.

Answer 1

[Walter Roberson]

Change your x and r to

    x=uint64(1:1:n);
    r=uint64(1);

[SAYANTAN BHANJA]

Thanks a lot sir..... It works perfectly now