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CALCULATOR

The Calculator is a mobile whose only purpose is to help you calculate simple mathematical formulae. If you tell it the formula you need to have evaluated, it will tell you the result back.

Example:

  > tell calculator 2 + 3 * 4
  The Calculator tells you '14'

If you feel lazy, t calc will work as well.

There is a short help available if you tell it help or ?.

The calculator internally works with double floats, so there's a limit to its precision.

If you're interested in details, here's the syntax it understands:

  expression = factor | factor + expression | factor - expression
  factor     = unary | unary * factor | unary / factor | unary mod factor
  unary      = exp | - unary | + unary | function unary
  exp        = atom | exp ^ unary | exp ** unary
  atom       = number | ( expression ) | | expression |
               | constant

  number     = [0-9]+(\.[0-9]+)?([eE][+-]?[0-9]+)?

The only constants available are pi, e and inf (or infinity).

The functions available are sin, cos, tan, asin, acos, atan, ln, exp, log (base 10 logarithm), floor (round down), ceil (round up), trunc (truncate decimals), round (round away from zero), and sqrt.

The calculator can also factorize numbers:

  > tell calculator factor 4711
  The Calculator tells you 'The prime factors of 4711 are 7 and 673.'