C Library Functions  - rnum0 (3)

NAME
rnum0(3f) - [M_calculator] returns real number from string expression using CALCULATOR(3f) (LICENSE:PD)

CONTENTS

Synopsis
Description
Dependencies
Examples
See Also
Author
License

SYNOPSIS
real function rnum0(inline) 

    character(len=*), intent=(in) :: inline
    integer,intent(out),optional  :: ierr

DESCRIPTION
RNUM0() is used to return a REAL value from a CHARACTER string representing a numeric expression. It uses the M_calculator(3fp) module.
inline INLINE is a CHARACTER variable up to (iclen_calc=512) characters long that is similar to a FORTRAN 77 numeric expression.
ierr error code. If zero, no error occurred

DEPENDENCIES
o User-supplied routines: All programs that call the calculator routine can supply their own substitute_subroutine(3f) and substitute_C(3f) procedures. See the example program for samples.

EXAMPLES
Sample program 

    program demo_rnum0
    use M_calculator, only : rnum0
    implicit none
    real :: x, y, z
       x=rnum0(’20/3.4’)
       y=rnum0(’CI = 10 * sin(3.1416/4)’)
       z=rnum0(’CI’)
       write(*,*)x,y,z
    end program demo_rnum0

SEE ALSO

o The syntax of an expression is as described in the main documentation of the Calculator Library.
o See EXPRESSION(3f), CALCULATOR(3f), STRGAR2(3f), INUM0(3f), DNUM0(3f), SNUM0(3f).

AUTHOR
John S. Urban

LICENSE
Public Domain

Nemo Release 3.1 rnum0 (3) June 29, 2025
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