CODEWITHSUNDEEP
typesintegerjulia
Pigna
Pigna

Reputation: 2924

Julia type questions

1 Why is it that when I define a variable and its type inside of a function everything's fine, but when it's a global variable I get error? Example:

  n::Int8 = 3
  ERROR: LoadError: UndefVarError: n not defined

2 Why is it that when I do some simple operations the variable type changes? Examples:

julia> function main()
           n::Int8 = 5
           c = collect(1:n)
           println(c)
           println(typeof(c))
       end
main (generic function with 1 method)

julia> main()
[1,2,3,4,5]
Array{Int64,1}


julia> n = zero(Int8)
0
julia> typeof(ans)
Int8
julia> n += 5
5
julia> typeof(ans)
Int64

3 How to maintain the variable initial type?

Upvotes: 3

Views: 243

Answers (1)

Isaiah Norton
Isaiah Norton

Reputation: 4366

Currently (Julia 0.4), questions 1 & 2 are answered by this statement in the Julia manual:

Currently, type declarations cannot be used in global scope, e.g. in the REPL, since Julia does not yet have constant-type globals.

As discussed in the comments, there are several options for #3.

Upvotes: 2

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