(bc.info.gz) Special Expressions

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 Special Expressions
 ===================
 
    There are a few more special expressions that are provided in `bc'.
 These have to do with user-defined functions and standard functions.
 They all appear as "NAME`('PARAMETERS`)'".   Functions, for
 user-defined functions.  The standard functions are:
 
 `length ( expression )'
      The value of the length function is the number of significant
      digits in the expression.
 
 `read ( )'
      The `read' function (an extension) will read a number from the
      standard input, regardless of where the function occurs.  Beware,
      this can cause problems with the mixing of data and program in the
      standard input.  The best use for this function is in a previously
      written program that needs input from the user, but never allows
      program code to be input from the user.  The value of the `read'
      function is the number read from the standard input using the
      current value of the variable IBASE for the conversion base.
 
 `scale ( expression )'
      The value of the `scale' function is the number of digits after the
      decimal point in the expression.
 
 `sqrt ( expression )'
      The value of the `sqrt' function is the square root of the
      expression.  If the expression is negative, a run time error is
      generated.
 

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