(dc.info.gz) Arithmetic

 
 Arithmetic
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 `+'
      Pops two values off the stack, adds them, and pushes the result.
      The precision of the result is determined only by the values of
      the arguments, and is enough to be exact.
 
 `-'
      Pops two values, subtracts the first one popped from the second
      one popped, and pushes the result.
 
 `*'
      Pops two values, multiplies them, and pushes the result.  The
      number of fraction digits in the result is the largest of the
      precision value, the number of fraction digits in the multiplier,
      or the number of fraction digits in the multiplicand; but in no
      event exceeding the number of digits required for an exact result.
 
 `/'
      Pops two values, divides the second one popped from the first one
      popped, and pushes the result.  The number of fraction digits is
      specified by the precision value.
 
 `%'
      Pops two values, computes the remainder of the division that the
      `/' command would do, and pushes that.  The value computed is the
      same as that computed by the sequence `Sd dld/ Ld*-' .
 
 `~'
      Pops two values, divides the second one popped from the first one
      popped.  The quotient is pushed first, and the remainder is pushed
      next.  The number of fraction digits used in the division is
      specified by the precision value.  (The sequence `SdSn lnld/
      LnLd%' could also accomplish this function, with slightly
      different error checking.)  (This command is a GNU extension.)
 
 `^'
      Pops two values and exponentiates, using the first value popped as
      the exponent and the second popped as the base.  The fraction part
      of the exponent is ignored.  The precision value specifies the
      number of fraction digits in the result.
 
 `|'
      Pops three values and computes a modular exponentiation.  The
      first value popped is used as the reduction modulus; this value
      must be a non-zero number, and the result may not be accurate if
      the modulus is not an integer.  The second popped is used as the
      exponent; this value must be a non-negative number, and any
      fractional part of this exponent will be ignored.  The third value
      popped is the base which gets exponentiated, which should be an
      integer.  For small integers this is like the sequence `Sm^Lm%',
      but, unlike `^', this command will work with arbritrarily large
      exponents.  (This command is a GNU extension.)
 
 `v'
      Pops one value, computes its square root, and pushes that.  The
      precision value specifies the number of fraction digits in the
      result.
 
    Most arithmetic operations are affected by the _precision value_,
 which you can set with the `k' command.  The default precision value is
 zero, which means that all arithmetic except for addition and
 subtraction produces integer results.
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