473,756 Members | 6,098 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

i need a source code compute logical expressions in lex/yacc

Hi.
i need a source code compute logical expressions in lex/yacc.
for Example:
(20>5) or (6<=6)--->true
(1<=2) and (3==1) --->false.

Jan 2 '07 #1
2 4496
deltaa5 wrote:
Hi.
i need a source code compute logical expressions in lex/yacc.
And your C++ language question is...?
for Example:
(20>5) or (6<=6)--->true
(1<=2) and (3==1) --->false.
Doesn't look so logical to me.

Jan 2 '07 #2

deltaa5 napsal:
Hi.
i need a source code compute logical expressions in lex/yacc.
for Example:
(20>5) or (6<=6)--->true
(1<=2) and (3==1) --->false.
You can reuse example in bison manual. See
http://www.gnu.org/software/bison/ma...tml#Infix-Calc
it does almost the same you need, you have to change only operations.

Jan 2 '07 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

9
5338
by: FISH | last post by:
Ever have one of those days when you're not sure if it's you who's gone mad, or the rest of the world? I have an Open Source project on SourceForge for communication with YSMG - Yahoo's IM protocol. I keep the project source in three directories, based upon the code's function: one for the network API code itself, one for the support APIs (basic chat spam filtering, Swing models, rich text decoders, etc), and one for the test client...
80
35129
by: Christopher Benson-Manica | last post by:
Of course one can get the effect with appropriate use of existing operators, but a ^^ operator would make for nice symmetry (as well as useful to me in something I'm working on). Am I the only one who would find it useful? -- Christopher Benson-Manica | I *should* know what I'm talking about - if I ataru(at)cyberspace.org | don't, I need to know. Flames welcome.
143
8089
by: suri | last post by:
Hello I downloaded glibc and tried looking for the code that implements the sine function i couldnt find the file. i went to the math directory and found math.h.. i guess that needs to be included for the sine function. but which .c file implements the sine/cosine and other trig fns thanks
2
55949
by: Michael Howes | last post by:
I have a single DataTable in a DataSet. It has 4 columns and i'd like to get a handful of counts of unique items in 3 of the 4 columns. Can a DataTables Select or Compute methods to COUNT DISTINCT? These two attempts failed DataRow dr = ds.Tables.Select( "COUNT(DISTINCT(site_name))" ); object x = ds.Tables.Compute( "COUNT(DISTINCT(site_name))", "ProductionCount > 0" );
25
2705
by: mdh | last post by:
Hi Group, Not looking for an answer, but more of an explanation. Thinking back to those heady days when you had the time to do them, may I ask this. Exercise 1-22 asks for a program to "fold" long input lines into 2 or more shorter lines before the nth column... etc etc. Now, there are numerous anwers on the web and in the "C answer book", which includes a function to expand the tabs to blanks ( depending upon where the tab is in...
0
1227
by: deltaa5 | last post by:
hi. i need a source code compute logical expressions in lex/yacc. for Example: (20>5) or (6<=6)--->true (1<=2) and (3==1) --->false.
13
5022
by: Berk Birand | last post by:
Hi, I am working on a school project where we use lex/yacc to write a compiler for a fictional (Java-like) language. I have handled all the details about the yacc and lex files, but I still have a question regarding the dynamic memory allocation for strings. When the lex file encounters a variable name, I want it to pass this to yacc through yylval, and then retrieve it to add to a syntax tree. For this purpose, I wrote the following...
2
7523
by: max.giacometti | last post by:
Hi everybody! I am using lex and yacc to write a vhdl to systemc converter. Lex simply reads the input file and yacc implements grammar and translation. I'd like to be able to make yacc able to command lex to stop reading the current file and starting reading another file, when the inclusion syntax is reached.
6
4884
by: mstorkamp | last post by:
I need to evaluate simple arithmetic expressions. I wrote a quick and dirty program that allows me to enter dimensions off of a drawing, and based on global or local tolerances calculate an upper and lower limit to put in an inspection worksheet. When it asks for a dimension I would like to be able to type in something like: '(12.5+10)/2' or '150-3.45' What I'm looking for is a function along the lines of 'double
0
9454
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
9271
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
8709
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
7242
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5139
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
5301
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
3804
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
3352
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2664
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.