Albegrical Expression

[Kleidemos]

How I can parsing and resolving albegrical expression with an algoritm in
C++??
This is an example of a exprexion that I wont parse:

5 * (3a + 4a) + 4a * (x+1)(x-1)

Tanks

 

[Jacques Labuschagne]

How I can parsing and resolving albegrical expression with an algoritm in
C++??
This is an example of a exprexion that I wont parse:

5 * (3a + 4a) + 4a * (x+1)(x-1)

Have a look at tools like Lex and Yacc (or Flex and Bison, if you
prefer). I avoid coding parsers by hand wherever possible.

HTH,
Jacques.

 

[Azathot]

It is difficult write a personal parser???

Simply, it is useless, when you have something alredy working,
well-functioning and well-formed as Bison++ . ;-)

 

[Kleidemos]

It is difficult write a personal parser???

Tnk

 

[David Harmon]

It is difficult write a personal parser???

It is much easier than messing around with YACC or Bison for simple
stuff. See the calculator example(s) code in Stroustrup.

 

[Chris Dams]

Hello,

How I can parsing and resolving albegrical expression with an algoritm in
C++??
This is an example of a exprexion that I wont parse:

5 * (3a + 4a) + 4a * (x+1)(x-1)

Perhaps you are interested in www.ginac.de .

Bye,
Chris Dams

 

[Jeff Flinn]

How I can parsing and resolving albegrical expression with an algoritm in
C++??
This is an example of a exprexion that I wont parse:

5 * (3a + 4a) + 4a * (x+1)(x-1)

Spirit will allow you to implement this in your C++ code natively. It is
part of boost or standalone:

http://www.boost.org/libs/spirit/index.html


http://spirit.sourceforge.net/

There are several expression examples.

Jeff F

 

[David Masters]

How I can parsing and resolving albegrical expression with an algoritm in
C++??
This is an example of a exprexion that I wont parse:

5 * (3a + 4a) + 4a * (x+1)(x-1)

I've done this in C. If you want a copy send me an email. BTW, you aren't
very clear how multiplication happens in your notation. Mine uses normal C
rules.
send a mail to (e-mail address removed) if you want it. It should work
in C++ but I haven't tried it.

David Masters

 

[Marc]

"Kleidemos" , dans le message (comp.lang.c++:731928), a écrit :

How I can parsing and resolving albegrical expression with an algoritm in
C++??

http://www.eleves.ens.fr/home/ollivier/mathlib/mathexpr.html