Error: LoadError: UndefVarError: user_input not defined

New to Julia
1

I’m new in Julia, honestly starting few moments ago seeing a tweet! I’m facing an unexpected error. It looks everything fine my code but still it results an error. Can anyone help me out?

Code:

while user_input != "END"

    print("Enter some input, or END to quit: ")

    user_input = readline() #prompt the user input

end

error message:

ERROR: LoadError: UndefVarError: user_input not defined

Stacktrace:

 [1] top-level scope

   @ f:\Julia Master Course\While loops.jl:1

in expression starting at *:\++++++++(Privacy reason)\While loops.jl:1

Code editor: VS code

2

You haven’t defined user_input before using it. You probably need another user_input = readline() before the while loop

1 Like
3

Thanks for the feedback! I was following this tutorial from freecodecamp: Learn Julia For Beginners – The Future Programming Language of Data Science and Machine Learning Explained

Can you explain why my code results an error?

4

Still holds. The code at your link does not work without predefining user_input.

julia> while user_input != "End"
                  print("Enter some input, or End to quit: ")
                  user_input = readline() # Prompt the user for input
              end
ERROR: UndefVarError: user_input not defined

vs

julia> user_input=""; while user_input != "End"
                         print("Enter some input, or End to quit: ")
                         user_input = readline() # Prompt the user for input
                     end
Enter some input, or End to quit:
1 Like
5

Thanks for the answer! Kind of really excited with Julia so did not catch the mistake. But, have to say, Julia impressed me!