update Primes.jl

[deva567]

Earlier primes(0) will through error like "The condition lo ≤ hi must be met." but now
primes(0) will return output as look like primes(0,0).

[rfourquet]

Thanks! This would need a bit more work to be merged: for changes like this, we need tests to avoid regressions. Also, given that e.g. primes(-10, -4) works, I believe we should update primes(n) such that this never throws, i.e. even for n<0, not only n==0.

[deva567]

@rfourquet just for clarification , we need to produce output for primes(-10,-4) as same as like primes(4,10) and one more thing primes(-10) whether it should equal to primes(0,10).
FYI attached sample PNG files

[rfourquet]

No, we have this method: primes(n) = primes(1, n), but conceptually this would be primes(n) = primes(-infinity, n). So for m <= n <1, we have isempty(primes(m, n)) == true, i.e. no primes are negative. So primes(n) for n < 1 should just return the empty list as well.

[deva567]

@rfourquet

FYI attached sample output and made changes in Primes.jl with the help of "if -else" now it can handle negative integer when we gave one parameter to the function and wont through error like earlier