Programming :: C++ - Basic Math Always Returns 0 ?
May 16, 2010Code:
Why are basic math problems returning 0? I know that Integers can only hold whole numbers, and it had the exact same problem when I used floats. I am using GCC 4.4.4.
ADVERTISEMENT
Software :: Use Basic Math Functions From The Command Line Like Sqrt?
Sep 14, 2010I have a user that wants to use basic math functions from the command line like sqrt and such. Apparently it was installed on the previous server we were using, but not on this new Debian server by default.
Anyone know what package has that functionality?
Debian Programming :: Can't Access Math Function
Apr 30, 2015When I try to compile this code:
#include <math.h>
int main (void) {
double x, y;
x = 2;
y = sqrt(x);
return 0;
}
With the command:
$ gcc test.c
I got this message:
/tmp/cc5QZmCN.o: In function 'main':
test.c:(.text+0x16): undefined reference to 'sqrt'
collect2: error: ld returned 1 exit status
I tried this on a fresh jessie install. I have the same problem on wheezy.
Programming :: Connect Math.h Library To C Program?
Jun 27, 2010I've started programming in c recently . following are the details about scene:
* vim is editor and program is compiled in gcc whenever a program involving math function appears it gives error i.though math.h is included in header file compiler complains about it it gives error of unrecognized function that math function like sqrt, etc question is how to connect math.h to a program.
Programming :: Complex Math Calculation In Shell Script?
Feb 16, 2010Here is my situation:I have a series of .plt files that are geared for a device that has it's xy origin at the lower left of the paper however some devices use the center of the paper as it's origin in a piped shell script how can I convert this file to a center origin plot file?Here are some knowns: the existing file always Lower Left 0.0 the existing file max xy is the page upper right x.x the desired output file must have it's 0.0 at the exact center of page (page size will vary). Ideas: Based on the sample files included maybe use PU and PD as the triggers for inputs to be calculated as any other commands have nothing to do with coordinates.
View 14 Replies View RelatedProgramming :: CPAN Cannot Install Math - Pari Module
Jun 8, 2010I wrote a perl script to feed information to our load balancer:
Code:
#!/usr/bin/perl
#
use strict;
#use warnings;
#
#
use Net::SSH::Perl;
my $user="bluethundr";
my $pass="secret";
my $dir="$ENV{HOME}/data";
open (LBVSERVERS), '<', "$dir/lb-vserver" or die "Couldn't open file: $!";
open (CSVSERVERS), '<', "$dir/cs-vserver" or die "Couldn't open file: $!";
my $ssh = Net::SSH::Perl->new("10.50.0.1");
$ssh->login("$user", "$pass");
print " .....
I need to be able to install the Math::Pari CPAN module in order to accomodate the Net::SSH CPAN module. The prereqs are installed:
Code:
cpan> install Net::FTP
Net::FTP is up to date.
cpan> install LWP::UserAgent
LWP::UserAgent is up to date.
But when I either try to install or force install Math::Pari this is what I get:
Code:
cpan> install Math::Pari
Running install for module Math::Pari
Running make for I/IL/ILYAZ/modules/Math-Pari-2.01080604.tar.gz
Checksum for /home/bluethundr/.cpan/sources/authors/id/I/IL/ILYAZ/modules/Math-Pari-2.01080604.tar.gz ok
Math-Pari-2.01080604/ .....
CPAN.pm: Going to build I/IL/ILYAZ/modules/Math-Pari-2.01080604.tar.gz
Did not find GP/PARI build directory around.
Do you want to me to fetch GP/PARI automatically?
(If you do not, you will need to fetch it manually, and/or direct me to the directory with GP/PARI source via the command-line option paridir=/dir)
Make sure you have a large scrollback buffer to see the messages, or 'tee' the STDOUT/STDERR to a file.
Fetch? (y/n, press Enter) y
Getting GP/PARI from ftp://megrez.math.u-bordeaux.fr/pub/pari/unix/
Cannot list (Failed to establish connection.
): at utils/Math/PariBuild.pm line 319, <STDIN> line 1.
Can't fetch file with Net::FTP, now trying with LWP::UserAgent...
You do not have LWP::UserAgent and/or HTML::LinkExtor installed, cannot download, exiting...
Programming :: Loops In Bash Shell Or Variable Math?
Oct 28, 2010I am trying to map the coordinates of a grid.
Code:
R=7 # number of rows (lines)
C=6 # number of columns
X=200 # initial horizontal location
Y=100 # initial vertical location
[code]....
Programming :: Setting Var Returns Command Not Found?
May 7, 2010I have the following function, and it appears to set the var correctly, but then tries and executes the line as a command. Anyone know how to keep it from doing that?
PHP Code: SMALL_FILE_PERCENTAGE=88
MEDIUM_FILE_PERCENTAGE=10
LARGE_FILE_PERCENTAGE=2
[code]....
Programming :: SSL_write Returns SSL_ERROR_SYSCALL, EOF On Second Call
Oct 8, 2010I am facing issue in my OPENSSL code. I have written openssl client. It sends request to the host and receives response for that request.
My problem is, it connects, sends request successfully to host at first time only in sencond attempt it fails on SSL_write(). where SSL_get_error() returns SSL_ERROR_SYSCALL error.
In that ERR_get_error() returns 0. man page shows "If ret == 0, an EOF was observed that violates the protocol".
Code Snippet.
w=SSL_write(SSLRequestData.ssl,c2s,c2sl);
switch(SSL_get_error(SSLRequestData.ssl,w))
{
case SSL_ERROR_NONE:
if(c2sl!=w)
[Code]....
Programming :: Use If Else Condition When Returns Empty Data?
Apr 27, 2010Let say I would like to check /etc/profile whether defined umask 022
umaskcheck=$(What to defined here?)
if [ What to define here? ]
then
[code]....
Programming :: Why Redefine Basic Types In C
Jun 24, 2010I guess I'm just a noob, but I notice that some C libraries (and even some C++ ones) tend to redefine the basic types with their own naming convention.
For example, OpenGL redefines the basic types:
Code: from GL/gl.h
typedef unsigned int GLenum;
typedef unsigned char GLboolean;
typedef unsigned int GLbitfield;
typedef signed char GLbyte;
typedef short GLshort;
typedef int GLint;
[Code].....
Programming :: C++ Class Member Pointer Changes After Function Returns?
Mar 30, 2011I'm venturing into the world of OpenGL, but in the process of writing my graphics library I ran into a problem... My code is:
Code:
#include <stdio.h>
#include <stdlib.h>
[code]...
Programming :: C Language Fuction Returns : Where And How Is The Fuctions Value Stored
May 23, 2010I'm studying the C Language, None of the documents I'm reading covers returning values from a function. They state that the function sends the valve to the caller but that is the only info I have. Do I have to create a varible with the name of the function I called and is it stored there?
View 14 Replies View RelatedProgramming :: Inotify_rm_watch Returns EINVAL On Legitimate Call?
Jul 29, 2011I am working on software that is to run on a variety of linux machines where changing the os/version is not an option.My software uses the inotify_rm_watch call, and this is occassionally failing. In every case the operands are both valid, yet the result is EINVAL. This appears to only occurr when a watched file is deleted, and the read command on the inotify yeilds two events IN_DELETE_SELF AND IN_IGNORE (at the same time).I have seen a few messages detailing this same scenario - but no workarounds.
View 7 Replies View RelatedProgramming :: Query That Returns Columns Where Some Of The Values Are NULL
Dec 23, 2010If I have a Query that returns columns where some of the values are NULL, is it possible to tell SQL to return all the NULL values as empty strings instead of the NULL datatype?
If the solution is vendor specific I am (unfortunately) using a Microsoft 2008 SQL server.
Example:
Code:
Select * from imaginary_table where id = 1
Might return:
Code:
Id: 1
Name:xyz
[Code].....
Programming :: Struct Timeval Doesn't Keep After Function Returns
Jun 2, 2010int GetTime(struct timeval tv)
{
gettimeofday(&tv, NULL)
printf("%d
", tv.tv_sec); /* here is the right value */
return 0;
}
[Code]....
What happend? struct timeval has a self timer?
Programming :: Basic Cross Compiling Tutorial?
Feb 4, 2010I have written a program that I would like to cross compile for x86 and x86_64 architectures. I have tried google and the search function here to no success, most information I find is too specific (instructions for a specific program), or dealing with cross compiling for windows on linux.Does anyone know of a tutorial dealing with straight making a 32 bit binary on a 64 bit processor (both are intel)?
View 2 Replies View RelatedProgramming :: Opening A Text File With C++ Or Visual Basic?
Apr 29, 2010I am a beginner at programming and have been given an assignment by my professor. Its a text file with lines of varying lengths. All I have to do is write a code to open the file and see the output in an excel sheet. Have been asked to use C/C++ or visual basic
View 5 Replies View RelatedProgramming :: PHP - Creating Basic Simple SSH Command To Machine Over SSL?
Jan 18, 2011I was thinking to install a very basic SSH gate, secured over SSL, like this [URL]
using PHP. However I would like to have it very basic and simple to install. (not database SQL, nor complicated things, ...) so that I get a prompt page with login and password to access the SSH-internet, and then can SSH the linux box over SSL and regular port 80 like they do. passwd would be in a txt file or whatever. You use index.htm and no one can scroll the tree of the directory. Would have someone already embedded php code for that?
Programming :: Learn Basic C++ - Implement Something Using System() Or Popen() Without Success
Jul 21, 2010I've got a (very) simple perl xinetd server that I'd like to port to C++. implement something similar using system() or popen() without success.
[code]...
Programming :: System() Routine Returns: Access: Unix Error (2) No Such File Or Directory
Oct 23, 2010I am running shell command through C program using system() routine.
I am executing "opcontrol --status" an executable using the this routine and I get the following error. access: unix error (2) No such file or directory
But when I give the complete path to the executable it runs perfectly.
The executable is installed in "/usr/local/bin/" And the path variable has this path.
Programming :: Create A Script That Returns A List Of The Users Who Have Never Changed Their Password From /etc/shadow
May 17, 2011I need to create a script that returns a list of the users who have never changed their password from /etc/shadow. As I know on linux there is a command "chage" used for find last password change.
View 2 Replies View RelatedFedora :: Update Error - Not Enough Space Or New Math?
Sep 1, 2010I just built a VMWare VM from the Fedora 13 DVD - 64 bit. It now wants to do 385 updates so I let it download all of the rpms. As it starts to do the install I get a Transaction Error to the effect
Quote:
Test Transaction Errors: installing package kernel-2.6.34.6-47.fc13.x86_64 needs 8MB on the /boot filesystem
System monitor shows that I have 19.7 MiB available on /boot - so what is going on?
Ubuntu :: PDF File Shows Math Symbols But Printer Does Not?
Jan 31, 2010I have Ubuntu 9.10 installed and up to date.
I have an HP Laserjet 2200 connected via USB with 64MB of memory. When I print page 2 of this document (for example) [URL] the delta-symbol and minus-signs do not show up, although I see them in Adobe reader version 9.3.
I have tried several of the available drivers for the printer (including the "[recommended]" one) and none of them produce these symbols.
I'm guessing this is a font issue. I don't know how to show you what font stuff I have installed.
[Code].....
Programming :: Grep In Bash Script Returns "No Such File Or Directory", Works Manually?
Feb 25, 2010To start, I'm writing a script to check a file's date via FTP. Here's the portion that I'm having problems with:
Code:
function checkRemote
{
[code]...
Programming :: Basic PHP Mail Function \ Say 'and If 'email' Is Not Equal To 0 Then Send The Mail?
Sep 9, 2010this is my code at the moment
PHP Code: <?php
if (isset($_REQUEST['email'])) && $_REQUEST['email']!='0'{
$to = "chrisathisemail";
[code]....
Server :: Ssh: Connect To Host Sage.math.washington.edu Port 22: Connection Timed Out
May 26, 2010I've been trying to ssh out of my home network to school computers and I keep getting:
ssh: connect to host sage.math.washington.edu port 22: Connection timed out
I've tried this on my machine (running Ubuntu 10.04) and on a windows 7 machine (using putty). I have been successful ssh'ing to this machine using either of the laptops from every other network I've tried, so I'm pretty sure it's something about my home network.
Fedora :: Firefox Will Returns An Error
Mar 11, 2011I am unable to run firefox on my Hp mini 110 running FC14. This happened, I think, after an update that I have done.
When ever I run firefox I get the following messages.
Code:
Fedora :: XAWTV Cannot Run - Returns Error
May 9, 2011I am using Fedora 14 (64 bit version): Can't Start XAWTV. Returns the error.
$ xawtv
This is xawtv-3.99.rc6, running on Linux/x86_64 (2.6.35.12-90.fc14.x86_64)
xinerama 0: 1920x1080+0+0
WARNING: No DGA direct video mode for this display.
WARNING: keeping fbuf pitch at: 7680, as no base addr was detected
WARNING: couldn't find framebuffer base address, try manual
configuration ("v4l-conf -a <addr>")
v4l2: WARNING: framebuffer base address mismatch
v4l2: me=(nil) v4l=(nil)
Warning: Missing charsets in String to FontSet conversion
Warning: Missing charsets in String to FontSet conversion
Oops: can't load any font
OpenSUSE :: Ssh Command Returns Error?
Feb 26, 2010I have a service on my Suse 11 server which runs an ssh command (using openSSH) on another box.The output below is returned, but legitimate output is also returned as if the command had executed successfully. For example, the service executes an ls command through ssh, gets the error below, but also the contents of the remote directory as output. This is a problem because the service retries the command until it receives no error. I have been unable to replicate this manually from the command line. Does anyone know what might cause this or what this error really means?
View 5 Replies View Related