How old is Adaline?

Computer Science Level 2

What would the following haskell code print?

current_year = 2015   
andy_birth = 1984   
andy_minus_adaline = 4   
adaline = andy - andy_minus_adaline   
andy = current_year - andy_birth   

main = putStrLn $ show adaline

Bonus: How does a similar piece of code behave in each of Python? What about Mathematica?

Inspiration: Calvin's Problem

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How old is Adaline?

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 5 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.