CODEWITHSUNDEEP
while-loopjuliaboolean-expression
mic tiz
mic tiz

Reputation: 75

Control the flow with logical operator in Julia

I am trying to run a while cycle with or and and conditions in Julia.

In Python I could do 

while something and somethingelse:
    staff happens

And the same thing with the or. But in Julia, even using the | and & operators, it doesn't seems to work, i.e.

t=0
while s != 0 & d <= N
   t+=1
   something happens
end

For the & condition, I made it work by using an if with the brake condition i.e.

t=0
while s != 0
  something happens
  t+=1
  if d>N
    break
  end
end

But I have no idea how to make it work for the or.

If it can be done in a single line, even better.

Upvotes: 2

Views: 1383

Answers (1)

Alex Riley
Alex Riley

Reputation: 176750

In Julia & actually performs bitwise-and and | performs bitwise-or. These operators have higher precedence than comparison operators so your condition is evaluated here as 

s != (0 & d) <= N

which is probably not what was intended.

You need to use && and || for the equivalent of Python's and and or operators. These operators perform short-circuit evaluation (documentation).

As in Python, comparisons (like != and <=) have higher precedence than boolean operators, so you shouldn't need additional parentheses.

Upvotes: 4

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