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  • C++ vector and segmentation faults

    - by Headspin
    I am working on a simple mathematical parser. Something that just reads number = 1 + 2; I have a vector containing these tokens. They store a type and string value of the character. I am trying to step through the vector to build an AST of these tokens, and I keep getting segmentation faults, even when I am under the impression my code should prevent this from happening. Here is the bit of code that builds the AST: struct ASTGen { const vector<Token> &Tokens; unsigned int size, pointer; ASTGen(const vector<Token> &t) : Tokens(t), pointer(0) { size = Tokens.size() - 1; } unsigned int next() { return pointer + 1; } Node* Statement() { if(next() <= size) { switch(Tokens[next()].type) { case EQUALS : Node* n = Assignment_Expr(); return n; } } advance(); } void advance() { if(next() <= size) ++pointer; } Node* Assignment_Expr() { Node* lnode = new Node(Tokens[pointer], NULL, NULL); advance(); Node* n = new Node(Tokens[pointer], lnode, Expression()); return n; } Node* Expression() { if(next() <= size) { advance(); if(Tokens[next()].type == SEMICOLON) { Node* n = new Node(Tokens[pointer], NULL, NULL); return n; } if(Tokens[next()].type == PLUS) { Node* lnode = new Node(Tokens[pointer], NULL, NULL); advance(); Node* n = new Node(Tokens[pointer], lnode, Expression()); return n; } } } }; ... ASTGen AST(Tokens); Node* Tree = AST.Statement(); cout << Tree->Right->Data.svalue << endl; I can access Tree->Data.svalue and get the = Node's token info, so I know that node is getting spawned, and I can also get Tree->Left->Data.svalue and get the variable to the left of the = I have re-written it many times trying out different methods for stepping through the vector, but I always get a segmentation fault when I try to access the = right node (which should be the + node) Any help would be greatly appreciated.

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  • encryption of a single character

    - by SystemicPlural
    What is the minimum number of bits needed to represent a single character of encrypted text. eg, if I wanted to encrypt the letter 'a', how many bits would I require. (assume there are many singly encrypted characters using the same key.) Am I right in thinking that it would be the size of the key. eg 256 bits?

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  • Intents? How to register to be alerted for incoming emails?

    - by Justin
    Extreme Android developer newbie here...well, new to Android development, not development in general. I want to write an application that gets notified when emails come into the device, and takes various actions based on data in the email (subject, sender, to, etc). I think what I have to do is create a BroadcastReceiver with an IntentFilter. The problem I'm having is figuring out what Intent(s) I need to "listen" for. Can anyone point me in the right direction? Thanks.

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  • Use the output of a command as input of the next command

    - by r2b2
    so i call this php script from the command line : /usr/bin/php /var/www/bims/index.php "projects/output" and it's output is : file1 file2 file3 What I would like to do is get this output and feed to the "rm" command but i think im not doing it right : /usr/bin/php /var/www/bims/index.php "projects/output" | rm My goal is to delete whatever file names the php script outputs. What should be the proper way to do this? Thanks!

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  • Centering of a div, but the normal CSS does not work

    - by Jean
    Hello, I want to center a div, but the general way is #selector{position:relative;margin:0px auto;} What exactly is wrong below #crp{top:40%; position:absolute; margin:auto;} The Div below is not nested but a standalone. The #crp is going to the extreme right. <div id="crp">...something goes here....</div> Thanks Jean

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  • Where does User.Identity data come from?

    - by niaher
    For example: if I am retrieving User.Identity.Name, does it come from .ASPXAUTH cookie or is retrieved from the database using my membership provider? Are any database requests made when I access User.Identity? Thanks. EDIT: Right now I am pretty sure it comes from an authentication ticket cookie, but can't find any official documentation to confirm this. Anyone?

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  • Mysql Syntax Error

    - by tarnfeld
    Any idea why this is popping up :( ? You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CREATE TABLE `clocks` ( `id` int(11) NOT NULL AUTO_INCREMENT, ' at line 6

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  • Saving a stream to file

    - by Loadman
    Hi, I have a StreamReader object that I initialized with a stream, now I want to save this stream to disk (the stream may be a gif or jpg or pdf etc). SO my code so far is: StreamReader sr = new StreamReader(myOtherObject.InputStream); I need to save this to disk (I have the filename). In the future I may want to store this to sqlserver I have the encoding type also, which I will need if I store it to sql server right?

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  • Creating "GDP in 1960" variable from GDP variables for different years

    - by Tom Smith
    Hi all, I'm pretty new to stata... I have a set of observations of the form "Country GDP Year". I want to create a new variable GDP1960, which gives the GDP in 1960 of each country for each year: USA $100m 1960 USA $100m 1960 $100m USA $200m 1965 --> USA $200m 1965 $100m Canada $60m 1960 Canada $60m 1960 $60m What's the right syntax to make this happen? (I assume egen is involved in some mysterious way)

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  • Is visual Studio 2010 express edition free

    - by nCdy
    Possible Dupe: http://stackoverflow.com/questions/2624589/visual-studio-express-2010-license Sorry for newbie question, but I saw there was some license file on ISO image and it tells it wont allow me to develop commercial software , but there was Free registration, and I think that after registration I can develop application on it for free . Correct me if I'm not right or Tell me if I am :) thanks.

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  • wxWidgets running on other machine

    - by snorlaks
    Hello, I created application which uses wxWidgets library using visual studio 2008. Now I would like to create version which may be run on other machine. Because right now when I want to run It on another machine there is an error: the application failed to start because its side-by-side configuration is incorrect. What can I do to make It work ?

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  • PHP - preg_replace with multiple matches

    - by Neil
    Let's say I have a string like: $text = "<object>item_id1a2b3</object>xxx<object>item_id4c5d6</object>" I want to convert it to: %ITEM:1a2b3xxx%ITEM:4c5d6 Here's what I've got: $text = preg_replace("/<object.*item_id([a-zA-Z0-9]+).*<\/object/","%ITEM:$1",$text); This isn't quite right, as the search is greedy. Thoughts? Thanks!

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  • Meta keywords question [closed]

    - by Mark
    Hi all, Wheter or not the meta keywords are very usefull i'm still tobbing with this issue: I have some standard keywords to describe my site: tv,webtv,radio,watch,listen,live. Now those keywords are shown on every of my 600+ pages as base-keywords, and then I append page specific keywords after them. Is this right or wrong? So should i have this: tv,webtv,radio,watch,listen,live,cnn,international,stream or cnn,international,stream For live example see seetor.com Kind regards Mark

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  • How to remove "Standard Error" column from xtable() output of an lm on R/RSweave/LaTeX

    - by Lucas Spangher
    I'm currently doing some data analysis on population data, so reporting the standard errors in the tables of parameter coefficients just doesn't really make statistical sense. I've done a fair bit of searching and can't find any way to customize the xtable output to remove it. Can anyone point me in the right direction? Thanks a lot, I didn't post this lightly; if it's something obvious, I apologize for having wasted time!

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  • Fireworks CS4 download link?

    - by Naren
    I'm trying to find a trial download link for Fireworks CS4 for windows and it has apparently disappeared off the face of the internet. The adobe site only has a "Coming soon" placeholder for CS5, and most of the other usual suspects like softpedia and brothersoft just redirect you to adobe. This is for work use, so I'm trying to stay off torrents and some of the shadier sites. Can anyone point me in the right direction? Thanks!

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