Programming :: C Bool Return Values Conventions
Oct 30, 2010
I have a function that returns a boolean value, True of False. Is there any convention whether 0 = False or 0 = True? It should be obvious, 0=False, 1=True. However programs usually return 0 on success and reserve higher numbers for error values. I.e. if the program finishes successfully (function int main() finishes successfully ), it returns 0 - and that contradicts that 0 should be false.
And especially if I want a function to do some computations on parameters passed by reference and return success status. Should it return 1 (true) for success, or should it return 0 for success - like any Unix program does?
Is there any convention for this?
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Oct 12, 2010
i am having two small issues with a function i have made.sorry if it is a mess, i am still learning bash.the first is calling the nonpersistssh function (second line) and assigning the return value to nonpersistdiag.the function returns 1, but nonpersistdiag seems to only contain 0. i am unsure on how to proceed.the second problem is the nested else clause on line 10. it is a syntactical error. how would i declare it correctly?
Code: function endsession(){
nonpersistdiag=$[nonpersistssh]# a function that returns an exit code
sudo /etc/init.d/ssh stop; sshdiag=$?
[code]....
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Apr 30, 2011
I've implemented a few custom system calls in my Ubuntu kernel, but I'm having some issues with the return values. Each function returns a variety of non-negative integers depending on which error is encountered. However, when I'm testing the system calls, the only negative value that gets returned to the user program is -1, regardless of what I have in the code.
Is there some special path I have to take to get the proper return values?
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Jul 18, 2011
Dear Advanced c/g++ on boost programers: I have copied and testd a simple (Copy a file with Boost) program from page 372, Example10-10, book(C++ cookbook)
[Code]...
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Mar 5, 2010
As a result, I want to know what this error means, and how to correct it.Here is my code:
Code:
#include <iostream>
#include <cmath>
#include <cstring>
using namespace std;
[code]....
It is once I use the 'try_crack' function inside of main that I get this error.
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Jun 30, 2010
I trying to write a UART(interfacing of serial devices) to linux machine but after I execute the following code to receive data I need to enter key (carriage return).... but I don't want to remove carriage return/enter key
[Code]....
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Jan 24, 2010
When you create a desktop icon, the properties of the icon include a command to invoke the application. That command can be given percent parameters like %U. Where are the meanings of those parameters documented?
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Nov 11, 2010
I can use hexedit to manually edit one or two hex values in a binary file, but if I want to change many of the, this is impractical. Is there any tool that will take parameters like Code: someTool filename byteNumber replacementByte ?
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Jul 2, 2009
The idea is to make a website to check the availability of domains and it works but its not pretty yet. Below is what i have till so far:
## this is the API from my domain registrar.
<?php $client = new SoapClient('http://api.sync.com/?wsdl');
## I have a search box that sends the request to this page
$var = $_GET ["s"];
## remove the most common subdomains from the request.
$var=eregi_replace("www.", "", $var);
$var=eregi_replace("mail.", "", $var);
$var=eregi_replace("ftp.", "", $var);
$var=eregi_replace("pop.", "", $var);
$var=eregi_replace("smtp.", "", $var);
## remove any TLD extension from the request.
$split = explode(".", $var);
$main = $split[0];
$arraysize = sizeof($split);
for ($x=1; $x<$arraysize; $x++) {
$tld .= "." . $split[$x];
}
## login to the API
$paramLogin = array('handle' => 'randall', 'password' => 'password');
## match the domain with any possible TLD
$varcom = $paramAvailDomain = array('sld' => $main, 'tld' => 'com');
$varnet = $paramAvailDomain = array('sld' => $main, 'tld' => 'net');
$varorg = $paramAvailDomain = array('sld' => $main, 'tld' => 'org');
$varbiz = $paramAvailDomain = array('sld' => $main, 'tld' => 'biz');
$varinfo = $paramAvailDomain = array('sld' => $main, 'tld' => 'info');
$vareu = $paramAvailDomain = array('sld' => $main, 'tld' => 'eu');
$varnl = $paramAvailDomain = array('sld' => $main, 'tld' => 'nl');
$varbe = $paramAvailDomain = array('sld' => $main, 'tld' => 'be');
$varde = $paramAvailDomain = array('sld' => $main, 'tld' => 'de');
$varcouk = $paramAvailDomain = array('sld' => $main, 'tld' => 'co.uk');
$varorguk = $paramAvailDomain = array('sld' => $main, 'tld' => 'org.uk');
$varname = $paramAvailDomain = array('sld' => $main, 'tld' => 'name');
$varmobi = $paramAvailDomain = array('sld' => $main, 'tld' => 'mobi');
$varin = $paramAvailDomain = array('sld' => $main, 'tld' => 'in');
$vartv = $paramAvailDomain = array('sld' => $main, 'tld' => 'tv');
$varcn = $paramAvailDomain = array('sld' => $main, 'tld' => 'cn');
$varws = $paramAvailDomain = array('sld' => $main, 'tld' => 'ws');
$varnu = $paramAvailDomain = array('sld' => $main, 'tld' => 'nu');
$varbz = $paramAvailDomain = array('sld' => $main, 'tld' => 'bz');
$varcc = $paramAvailDomain = array('sld' => $main, 'tld' => 'cc');
## this requests the domain.COM and domain.NET
$varcom;
$varnet;
?>
<div id="content">
## below prints the result
<?php
print "<html><body><pre>";
$result1 = $client->__soapCall('Login', $paramLogin);
echo "<b>Result Login:</b>
" . print_r($result1, true);
$result15 = $client->__soapCall('AvailabilityDomain', $varcom);
$resvarcom = var_dump($result15, true);
$result15 = $client->__soapCall('AvailabilityDomain', $varnet);
$resvarnet = var_dump($result15, true);
print "</pre></html>";
?>
<?php
## the returned array looks like this
Result Login:
Array
(
[code] => 200
[message] => Login succesful
)
array(3) {
["code"]=>
string(3) "200"
["message"]=>
string(20) "Domain not available"
["result"]=>
object(stdClass)#236 (1) {
["status"]=>
string(5) "TAKEN"
}
}
bool(true)
array(3) {
["code"]=>
string(3) "200"
["message"]=>
string(16) "Domain available"
["result"]=>
object(stdClass)#232 (1) {
["status"]=>
string(4) "FREE"
}
}
bool(true)
?>
## till so far it works
What I need to do is to make this ugly looking reply in to something more readable, basically if TAKEN print occupied and if free print its yours to grab. I have been struggling with the in_array function but i'm not getting anywhere close in getting it to work.
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Jul 11, 2010
I have been reading the Wikibook on C Programming for quite some time and am up to the variable part. I did learn several new things, like that too many variables hog memory.
What I want to know is how to assign a variable to the keyboard (in the C/C++ family) as such that the user has to type it in.
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May 23, 2010
I have the following snippet HTML code:
Quote:
<table id="profile">
<tr>...............</tr>
<tr>
<td width="40%">
[Code].....
How can pass values in args[0] and args[1] to Perl/CGI script?
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Jun 13, 2009
I created a class which has to return an array. My problem is I need to return 3 entries per record for example:
Code:
array(
"2009-06-13", "John", "Doe";
"2009-06-13", "Paul", "Simon";
"2009-06-12", "Frank", "Herbert";
);
Can this be done? What is the syntax? Where is the documentation? If this can't be done, How would you return this to a class without using a DB?
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Feb 24, 2009
I have a application in C++, and now I have two class. MyDialog is the class that main function launch. In MyDialog class there are four elements and when I click over theese elements, there is a MousePressEvent that launch other class, Touchpad class. So, in some moments, I have loaded two class. My question is, how can pass a value from Touchpad class to MyDialog class, when I close (destroy) Touchpad class. In a few words, is it possible to communicate values between class?
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Sep 11, 2014
I am developing a script to automate some database setup, but I have an issue I cannot figure out. I prompt for some input with whiptail and select a default if nothing is entered. However, if you do not enter anything, it normally returns 0, but this time it is returning an empty value.
Code: Select all # This one does work!
# Set the source path
TMPPATH=$(whiptail --backtitle "Linux Build Configuration"
--title "Source-Code Path"
--inputbox "Default: $SRCPATH" 0 60
3>&2 2>&1 1>&3)
[Code] ....
So what is wrong with the second code?
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Jan 24, 2010
Does anyone know what the Inet/AMD instruction 'nopl' is or does anyone know where I can find a list of hex values for the Intel/AMD instructions. nothing important is waiting on this reply.
[Code]...
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Jan 24, 2011
I have a variable in which the data is stored as below:
variable_test=0m0.001s 0m0.001s 0m0.001s 0m0.001s 0m0.001s 0m0.001s .....an so on.
There are lots of values in format like "3m1.057s" are stored in variable_test separated with an space between two such values. For exapmple, value is "3m1.057s" I need to save different parts of a value in three separate array variables such as the
var_hour=3
var_min=1
var_sec= 057
tell if this can be done using "awk". A "WHILE" loop might be used to separate and store theses values I guess?
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Jul 24, 2011
Whats wrong with this:
Code:
#include <stdio.h>
int main(int argc, char *argv[])
{
if(argv[4] == "-verbose")
{
printf("Verbose is on");
[Code]...
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Mar 23, 2010
I'm creating my personal site in HTML/CSS and Perl/CGI. I have a list of links:
Quote:
<a name="link1" href="/cgi-bin/script.cgi">value1</a>
<a name="link2" href="/cgi-bin/script.cgi">value2</a>
<a name="link3" href="/cgi-bin/script.cgi">value3</a>
<a name="link4" href="/cgi-bin/script.cgi">value4</a>
<a name="link5" href="/cgi-bin/script.cgi">value5</a>
I want capture values of "value*" in <a> tags with script.cgi.
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May 13, 2010
Code:
DWORD type = REG_NONE;
int i = 0;
[code]....
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Mar 24, 2011
We are running some script to generate below values however we don't need the first level output as it always shows cpu % as 0.0.
(We dont need following part:
NAME STATE CPU(sec) CPU(%)
XXX -----r 55567 0.0
[code]....
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May 5, 2010
I am trying to import variable values from a profile file to a perl program.
I am using the below command for doing it.
Quote:
system (". /opt/bbfb/bin/setbbfbenv $codeset");
the above command does make variable values available to the running perl program..
Can some one help me on this front..
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Feb 1, 2011
I have written a code on Linux that searches a long dictionary. I have used hsearch() function but the problem is it does not work. This is my code://Search the count values from the dictionary.
Code:
#define _GNU_SOURCE
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<search.h>
#include<inttypes.h>
#include<math.h>
[Code]...
I open each DIC file, get the word from it and search the hash table and extract the key from it. The problem with the above code is that it is able to make the hash table but it returns NULL when searching. It should not return NULL in any case because all words from DIC files are there in the dictionary. I am not able to figure out why?
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Sep 21, 2010
I need a shell script which gathers the data from a remote XML file and then displays it according to my needs.. I need this for my job due to the fact that I need to keep track price changes of euro, usd, gold, etc. The XML file I am talking about is located at this page: here. The reason I am posting the URL is that I need to use curl to get this file and it does NOT have newlines after each tag. I thought that that would be a problem. Here is what I need from the script: 1) curl to get the page 2) make use of sed, awk, etc. to display its contents in a more structured and readable manner as shown below:
A: 64.125 (% -0.26)
B: 81.130 (% -0.32)
C: 1.4930 (% 0.00)
D: 1.9590 (% 0.36)
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Feb 9, 2010
I want to insert values into a MySql database. The following line works fine:1
Code:
mysql_query(connection, "INSERT INTO main (NumofShows , Title) VALUES('12', 'Home')");
but if the data to be inserted is from a string... like....
Code:
string NewTitle = "Monaco";
string NumofShows = "2";
How do i edit my sql statements so variables can be inserted into the Values ( ) , and it will be able to read the variables and then store it into the database.
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Feb 17, 2011
I have the most strange problem ever in programming. I fork a process into a parent and a child. In every forked process i declare a pointer, malloc and define a different value for every pointer.When i printf the value and the address guess what? They both have the SAME ADDRESS but DIFFERENT values, as assigned..Here's the portion of my code:
pid = fork ();
switch (pid)
{
[code]....
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Mar 15, 2010
I was digging through my laptop tonight and I realized I'd like more control over my home folder. It seems as though programs installed on my laptop just pick their own conventions for saving data and none of them are the same. Some programs store their data in self named hidden folders, others use ~/.config and others use ~/.local/share to put their stuff. Is there a way I'm missing to get all these to cooperate or are we doomed to always having programs making themselves at "home" and just tossing off their shoes wherever they like?
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Apr 27, 2011
I have a java compiler and Im using a double intiger called Experience and when compiled and run the double intiger does not hold intiger values that are mathameticle. Like 1.5 - 1.4 will equal .100000000000000000009 and 5/3 will equal 1.0. and 1.5x 1.4 doesnt equal 2.1. Is there something I am doing wrong with double intigers? Is it the compilers fault? Could it be something thats wrong with my computer and the compilers I am using are not tat fault? Anyways double 1.5 + 1.4 does equal 2.9 so.
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Mar 5, 2010
I have a fallowing simple bash script:
Code:
#!/bin/bash
echo -n "Please insert your name: "
read NAME
[Code]....
It works fine, but is it possible to have default values using bash read(1b)? I mean if user is prompter for sex, he just pushes ENTER and by default 'm' is chosen. Or if user is prompted for hometown and he doesn't insert anything, but just pushes ENTER button, 'New-York' sis chosen by default Are such default values possible in bash?
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Dec 1, 2008
I am writing a script to mine data from my game server logs which are going to mysql. My first question is syslog-ng is sticking $msg into one colum it self, $msg tends to be a long string here are a few examples:
cn name team frag death flags role host.
0 Maik CLA 2 0 0 normal *.70.233.118.
1 lizardncd RVSF -1 3 0 normal
[*.22.247.40] lizardncd fragged Maik.
And they are not always in the same format, How could I parse this data to do something useful, like creating a user stats page with frag counts and flag counts. Should I create a script that runs in a cronjob that parses this data to a new table maybe once a day. Even then the $msg string value is random and I am thinking in terms of awk.
Second. I would like to keep track of what ip's are using what nicknames. Kinda in the sense of and ip associated to a array of names that have been used on that ip address so I can keep track of users. How would this work logically with a mysql db, could a column allow multiple values, then loadable into an array, which then can add, remove, and store to mysql.
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Mar 30, 2011
I'm working on a script to table the outputs of various commands that depend on each other. The commands are these:
Code:
[root@kybsdc2 ~]# raw -q /dev/raw/raw1
[root@kybsdc2 ~]# sginfo -a /dev/dm-5 | grep Serial
[root@kybsdc2 ~]# multipath -ll
which give these outputs:
Code:
#/dev/raw/raw1:bound to major 253, minor 5
#Serial Number 'P3e8hZWrsSeX'
#netapp (360a9800050336538685a577273536558) dm-5 NETAPP,LUN
[size=1.0G][features=1 queue_if_no_path][hwhandler=0][rw]
[code]....
Also the RAW13 device has completely wrong output due to 1 occurring more times throughout the sequence causing more information to be displayed then needed. The last point is if I could somehow remove the '' in the serial number outputs and the = sign from the device sizes. I guess I will have to either put a whole lot of logical IF or CASE statements in but somehow I need to streamline and make this code dynamic!
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