Explicit_Typing

 Type declaration statements explicitly specify the data type of
 scalar variables.  For example, the following statements associate
 VAR1 with an 8-byte complex storage location, and VAR2 with an
 8-byte double-precision storage location:

   COMPLEX VAR1
   DOUBLE PRECISION VAR2

 You can explicitly specify the data type of a scalar variable only
 once.

 An explicit data type specification takes precedence over the type
 specified by an IMPLICIT statement.  If no explicit data type
 specification appears, any variable with a name that begins with
 the letter in the range specified in the IMPLICIT statement becomes
 the data type of the variable.

 Character type declaration statements specify that given variables
 represent character values with the length specified.  For example,
 the following statements associate the variable names INLINE, NAME,
 and NUMBER with storage locations containing character data of
 lengths 72, 12, and 9, respectively:

   CHARACTER*72 INLINE
   CHARACTER NAME*12, NUMBER*9

 In single subprograms, assumed-length character arguments can be
 used to process character strings with different lengths.  The
 assumed-length character argument has its length specified with an
 asterisk, for example:

   CHARACTER*(*) CHARDUMMY

 The argument CHARDUMMY assumes the length of the actual argument.