var a = [
    '5**3**2',
    '(5**3)**2',
    '5**(3**2)',
    '5 ** 3 ** 2',
    '5 ** 3**2',
    '5**3 ** 2',
    '[5,3,2]«**»',
]

a.each {|e|
    "%-12s == %s\n".printf(e, eval(e))
}