HP Fortran Programmer's Guide (March 2010)

Controlling data storage
Increasing the precision of constants
Chapter 3110
For information about increasing the precision of variables, see “Increasing default data sizes”
on page 111. The HP Fortran Programmer’s Reference describes the syntax of the kind
parameter and the exponent form and the +real_constant option. For detailed information
about how floating-point arithmetic is implemented on HP 9000 computers and how
floating-point behavior affects the programmer, refer to the HP-UX Floating-Point Guide.