(bc.info.gz) Variables

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 Variables
 =========
 
    Numbers are stored in two types of variables, simple variables and
 arrays.  Both simple variables and array variables are named.  Names
 begin with a letter followed by any number of letters, digits and
 underscores.  All letters must be lower case.  (Full alphanumeric names
 are an extension. In POSIX `bc' all names are a single lower case
 letter.)  The type of variable is clear by the context because all
 array variable names will be followed by brackets ( [ ] ).
 
    There are four special variables, SCALE, IBASE, OBASE, and LAST.
 SCALE defines how some operations use digits after the decimal point.
 The default value of SCALE is 0. IBASE and OBASE define the conversion
 base for input and output numbers.  The default for both input and
 output is base 10.  LAST (an extension) is a variable that has the
 value of the last printed number.  These will be discussed in further
 detail where appropriate.  All of these variables may have values
 assigned to them as well as used in expressions.
 

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(bc.info.gz) Numbers

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