Okay, I want to allow the user to define their own variables and
equations and then use them to run a program. The user picks the
option to create a list of variables
If the user enters in r d and s at the prompt
how would you define each as a double variable?
Secondly I want to allow the user to enter in an equation that would
stored in a file than spit out when the program is running to
calculate the values. Let's say the user put
r+d+s
I was thinking of opening up a filestream and reading the user entered
equation into a file as a string
cin >equation
fileout << equation
then reading it back into the string variable once the user chooses
the option to calculate values.
filein >equation
and using the variables and the equation to calculate x.
x = equation
But I think it will give me errors since x just might spit out the
string. Can someone help me figure out a way to get this to work?
Thanks
5  1552  nk****@gmail.com wrote:
Okay, I want to allow the user to define their own variables and
equations and then use them to run a program. The user picks the
option to create a list of variables
[..]
Programming an interpreter has been covered in literature for quite
some time now. Please google for "C++ expression interpreter".
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
On Jul 24, 2:21 pm, "Victor Bazarov" <v.Abaza...@comAcast.netwrote:
nko...@gmail.com wrote:
Okay, I want to allow the user to define their own variables and
equations and then use them to run a program. The user picks the
option to create a list of variables
[..]
Programming an interpreter has been covered in literature for quite
some time now. Please google for "C++ expression interpreter".
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
Actually, I only get mostly this and related comments back with
google. I only want to parse equations and numerical values so
hopefully it won't be too complicated nk****@gmail.com wrote:
On Jul 24, 2:21 pm, "Victor Bazarov" <v.Abaza...@comAcast.netwrote:
>nko...@gmail.com wrote:
>>Okay, I want to allow the user to define their own variables and
equations and then use them to run a program. The user picks the
option to create a list of variables
[..]
Programming an interpreter has been covered in literature for quite
some time now. Please google for "C++ expression interpreter".
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
Actually, I only get mostly this and related comments back with
google. I only want to parse equations and numerical values so
hopefully it won't be too complicated
Get a hold of a copy of TC++PL by Stroustrup and open chapter 6
("Expressions"). It contains an example of expression interpreter
you could model/extend on.
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
Victor Bazarov wrote:
nk****@gmail.com wrote:
>On Jul 24, 2:21 pm, "Victor Bazarov" <v.Abaza...@comAcast.netwrote:
>>nko...@gmail.com wrote:
Okay, I want to allow the user to define their own variables and
equations and then use them to run a program. The user picks the
option to create a list of variables
[..]
Programming an interpreter has been covered in literature for quite
some time now. Please google for "C++ expression interpreter".
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
Actually, I only get mostly this and related comments back with
google. I only want to parse equations and numerical values so
hopefully it won't be too complicated
Get a hold of a copy of TC++PL by Stroustrup and open chapter 6
("Expressions"). It contains an example of expression interpreter
you could model/extend on.
V
Get c-snips from http://www.cs.umu.se/~isak/snippets/
They have code for eval.c a simple command line calculator.
Also a ton of other small, usefull c cource.
Enjoy. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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