doc [ci skip]

Author: scivision

README.md

@@ -4,7 +4,8 @@
 # RPN Reverse Polish Notation Calculator -- in Fortran
 
 The `funcs.90` module provides over 100 elemental functions not found in Fortran instrinsics.
-A Fortran 2008 compiler is required such as `gfortran` or `ifort`.
+A basically Fortran 2008/2018 compatible compiler is required such as `gfortran` or `ifort`.
+Fortran 2008 compliance is a must.
 
 Specifically, RPNcalc is covered by continuous integration and testing on Linux, Mac and Windows, including:
 * Gfortran 5, 6, 7, 8 
@@ -16,7 +17,7 @@ Default size is 4.
 
 #### Authors
 * Fortran 77 code: David G. Simpson
-* Fortran 2008 code: Michael Hirsch
+* Fortran 2018 code: Michael Hirsch
 
 ## Build
 
@@ -61,7 +62,7 @@ Show what modes the calculator is in with:
 
 
 ### Modes
-The Fortran 2008 RPN calculator has 3 operating modes.
+The Fortran 2018 RPN calculator has 3 operating modes.
 The default mode is REAL
 
     COMPLEX     COMPLEX mode
@@ -418,6 +419,6 @@ Many functions not commonly found in RPN calculators are included:
 
 ## Notes
 
-Due to lack of basic Fortran 2008 support, the following compilers do NOT yet work:
+Due to lack of basic Fortran 2008/2018 support, the following compilers do NOT yet work:
 * Flang 5.0
 * PGI 2018

src/calc.f90

@@ -1,4 +1,4 @@
-! main program for Fortran 2008 RPN calculator
+! main program for Fortran 2018 RPN calculator
 
 !---- (historical notes) -----------
 !  Programmer:   David G. Simpson
@@ -26,7 +26,7 @@ PROGRAM RPN
 LOGICAL :: NUM_FLAG = .false.
 
 
-print *, 'Fortran 2008  RPN Calculator, Version '//VERSION
+print *, 'Fortran 2018  RPN Calculator, Version '//VERSION
 
 !     Initialize data.
 

src/eval.f90

@@ -73,6 +73,7 @@ recursive SUBROUTINE EVAL (STR)
 select case(str)
 
 case('HELP')
+  call eval('VER')
   call eval('MODES')
   call eval('PS')
   call eval('PR')
@@ -3581,7 +3582,7 @@ recursive SUBROUTINE EVAL (STR)
    print '(A,I2.2,A1,I2.2,A1,I2.2)', '  Time:  ', HOUR, ':', MINUTE, ':', SECOND
 
 case('VER')                                                ! VER
-   print *, 'Fortran 2008  RPN Calculator.  Version '//VERSION
+   print *, 'Fortran 2018  RPN Calculator.  Version '//VERSION
 
 case('VERS')                                               ! VERS
    SELECT CASE (DOMAIN_MODE)