[OSRS-PROJ] Uk Grid projection

[Tim Sutton]

Hi 

I have two questions:

1) I would like to convert  coordinates from UK National Grid to lat/long. 
>From the proj manual and ordinance survey information, I calculate the input 
projection definition to be:

+proj=tmerc +lat_0=49n +lon_0=2w +k=0.9996012717 +ellps=airy +a=677563.396 
+b=6356256.910

How would I specify that I want the output coordinates to be in lat/long using 
proj on the command line.?

2) Is there a simple 'hello world' c++ example that demonstrates the libproj 
programmatic interface, as I need to do the above process programmatically.

I am woking on suse linux 9.0

Many Thanks

Regards
-- 
Tim Sutton
BDWorld Middleware Programmer
-------------------------------------------------------------------
BiodiversityWorld Project
Centre for Plant Diversity & Systematics
School of Plant Sciences
The University of Reading
Reading, RG66AS, UK

Web     :   www.bdworld.org
Phone  :   +44-(0)118-378-6052  
Email    :   t.sutton [at] reading.ac.uk
(email preferred method of correspondence)
-------------------------------------------------------------------
----------------------------------------
PROJ.4 Discussion List
See http://www.remotesensing.org/proj for subscription, unsubscription
and other information.