Subj : String to double
To   : borland.public.cpp.borlandcpp
From : john blackburn <john.blackburn@lintonhealy.co.uk>
Date : Wed Apr 07 2004 11:10 am

I am writing a cross assembler for an old museum mainframe and need to
initialize floating point constant values.  I need to convert a C++ string
such as "0.15406" to a double so that I can subsequently extract a 19 bit
mantissa from it into a 32 bit int (this old machine has half support in
hardware for floating point i.e. it supports the mantissa but the exponent
is handled in software).  I have a similar requirement for string
conversion to int such as "3456".

I haven't seen in Stroustrup a method/function for converting the string to
a double; is there one and what is the syntax if it exists ?  Clearly I can
write one but I want to use the standard methods wherever possible.  Also,
I want to avoid anything from C++ Builder GUI because I want to allow
others to recompile it to Linux/Unix/Mac etc.  Hence, I want to stick to
the C++ standard library.


Thank you for looking at this


John

.