Software :: Conditional Operator In C?

Feb 24, 2010

if anyone knows plz explain this conditional operator timeout ? : MAX SCHEDULE_TIMEOUT

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General :: BASH Script Alphabetical Conditional Operator Query?

Mar 14, 2010

I am using "if" to force a word under the condition that the first letter of that word must be a letter of the alphabet, regardless of capitalization, using the " "" != "" " syntax.

Like so:

Code:
if [[ "$interface" != "WHAT DO I PUT HERE?" ]] ; then
echo "Invalid input"
exit 1
fi

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Programming :: C++ Operator Overloading Within Already Overloaded Operator

Apr 16, 2011

I'm having a bit of an issue using overloaded operators in an already overloaded operator. In my following code, I have overloaded the && operator to compare two Course objects. The operator in turn goes to a function which calls other overloaded operators to compare private object variables of that object to compare them.

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Ubuntu :: Bash If/then Conditional Syntax?

Feb 7, 2011

I pride myself on at least trying to help myself before I ask, but I've been staring at this a long time, I'm just not getting any traction.I've literally got 3 linux references on my desk right now that say that I should be able to use if conditionals, for example

[ -d FILE ]True if FILE exists and is a directory.
[ -e FILE ]True if FILE exists.
[ -f FILE ]True if FILE exists and is a regular file.

[code]....

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Server :: Conditional (on Ip Address) /etc/issue.net Possible?

May 27, 2010

I'm running Debian with openssh 1:5.1p1-5 and I've got an operational and legal /etc/issue.net but I'd like to make it depend on the incoming IP address. To be more specific, I'd like to achieve that no banner is shown when logging in from my company's IP range(s) or when logging in from home, but any unknown address (potential intruder) should be confronted with our legal warning.Is this at all possible?The server is located off-site and only has one ethernet device active (i.e. I cannot say eth0 is external, eth1 is internal)

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Software :: Makefile Conditional Does Not Work?

Jan 29, 2010

I'm trying to write a make file to deploy software in a production setup.

The first thing I'm trying to do is detect if the user running the make is root.

From the documentation scattered about, I came up with this:

Code:

USERID=$(shell id -u)
all:
$(info User Id is $(USERID))
ifeq ($(REQUIRED_USER),0)
$(info Running as root... OK)

[Code]....

As you can see, in both situations, make executes both branches of the conditional.

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Programming :: Conditional Foreach Loop In Perl?

Jun 1, 2010

#!/usr/bin/perl -w
use strict;
my @files = `ls -1`;

[code]...

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CentOS 5 :: Application Hangs In Conditional Wait?

Dec 18, 2009

I am facing the following issue. My application runs perfectly in red hat linux(32bit, 64bit physical m/c and 32 bit vmWare m/c) and in one version of centOS(32bit physical m/c - don't remember the version:Sorry). However when I am running the same application in CentOS 5.4 (64bit version) I face the following issues -

a. the application gets stuck in the conditional wait even though the signal is sent after the application has moved to conditional wait. b. vsftpd service start fails from within the application even though the service starts and stops peroperly from console.

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Programming :: Cannot Get Conditional Statements To Work In XDialog/Dialog

Feb 5, 2011

I cannot seem to get if else statements to work. if $choice == Dog then i want it to say "you selected Dog" The variable choice has the value Dog in it as proved at the end by echo "yes $choice is $choice" following the error Code: ./test.sh: 37: [$choice: not found How do i get the conditional statement to work? What's wrong here? This is the full script:

Code:

#! /bin/sh
: ${DIALOG=dialog}
: ${DIALOG_OK=0}

[code]....

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Programming :: Can't Get The OR Operator To Work?

Apr 18, 2011

I'm having a bit of trouble getting the OR operator to work.This is the code that I have:

global.php:
Code:
$vars["admin link"] = "<a href='/path/to/admin.php'>Admin</a>";
$vars["admin ip"] = "xxx.xxx.xxx.xx1";
$vars["admin ip2"] = "xxx.xxx.xxx.xx2";

[Code]...

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Programming :: TCL AND Operator (&) On A Binary Value?

May 1, 2010

I have a binary value which I receive from a controller. Say this binary value is 42. Just plain hex 42. If you would look at that byte in a debugger you would see 42.Now this value hold 8 bits each indicating a high or a low output. So 0x42 = 01000010b. Which means bits 1 and 6 are '1'.When I would want to find out which bits are set and which are not in a language like C, I simply do:

Code:

mask = 0x80;
if (binval & mask) {...}
etc..

However I am programming in TCL, and I try to do:

Code:

set mask 0x80
if { [expr ($binval & $mask) > 0] } {...}
etc...

this fails. At the moment the expr is executed, $binval is evaluated and substituted so the expression I am evaluating is

Code:

set mask 0x80
if { [expr ('B' & '0x80') > 0] } {...}
etc...

Eventually I got it working by converting the $binval into a '0x42' string value, like this:

Code:

binary scan $binval c byte
set byte [format "0x%0x" $byte]
set mask 0x80
if { [expr ($byte & $mask) > 0] } {...}
etc...[

Then the expression yields what I want. But this seems so stupid and clumsy. Isn't there a better way where I can compare two binary values without conversions?

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Programming :: No Match For 'operator<<' In '((HttpRequest*

Jul 13, 2011

I have a simple program from book C++ cookbook, page 291, 8.3, Using Constructors and Destructors to manage resources (or RAII), but it can not get compiled in my g++

------------------------------------------------------------------------------------------------
// Example 8-3. Using constructors and destructors
#include <iostream>
#include <string>
using namespace std;

[code]....

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Programming :: Getting A Comparison Operator To Work?

Feb 8, 2010

I'm very new at Bash scripting and have a bone head issue that I'm trying (and failing) to resolve. I cannot get this one IF statement to work, it seems the comparison operator does not think the resulting number from the $b*$c+$b operation is an integer even though it is a number. Below is a small proof of concept script with the bit I'm having trouble with.

Code:
#! /bin/bash
a=800
b=700
c=.15
if [ "$a" -le "$(echo "($b*$c+$b)"|bc)" ]

[Code]...

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Debian Programming :: Square Bracket Operator?

Sep 1, 2014

Is there a way to achieve the following with the square bracket operator?I have a class:

Code: Select allclass A
{
public:
    void SetValue(int index, Item* B);
private:
    int m_iCount;
    ItemCollection Item_Collection;

[code]....

The probelm is that I am not just blindly assigning whatever given on the right hand side to the returned value from operator [], I need to verify it's not NULL, and it is not already there in the Item_Collection, and I also need to increase the count.

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Programming :: Operator For Floating Point Comparison?

May 10, 2011

I know it is wrong to use the "==" operator to compare the equality of two floating point numbers. Logically it would seem that if the "==" operator is not usable for floating point comparison, then the "<=" operator would also not be usable. Is this true? The lack of google search results on this topic made me think that it must be true. If that is true, then is it true that the only way to compare floats with <= or >= is with something like the code below? Code: bool smaller_than_or_equal(float a, float b) {

if ( fabs(a-b) < EPSILON){return true;}
else if (a < b) {return true;}
else {return false;}

} I think this is a general question, but if specifics are necessary, I am using the C++ language to code at the moment.

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General :: Use The ?: Operator For If-else Decision In A Shell Script?

Jan 29, 2010

i am not able to understand the appropriate thing to put in the google search...

Is there a way to use the ?: operator for if-else decision in a shell script?

edit: the 'question mark - colon' operator (just editing so that its searchable by someone in need :-P)

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General :: Bareword Found Where Operator Expected?

Oct 14, 2010

$dec93 = 93;
$ser = SERVO;
$lbit = uc(sprintf("%02x
", $dec93));
if($lbit == 5D){
print DATA "Byte11: $fbits11=$bstr11 Bits:[95-88] $ser
";
}else{
sleep(1);
}

Why do I get this error? Bareword found where operator expected at C:Perl ScriptsLbits.pl line 64, near "5D" (Missing operator before D?)

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Server :: Use Tyan System Operator (TSO) In Ubuntu?

Nov 25, 2010

Does anybody here use Tyan System Operator (TSO) in ubuntu sever? It seems that the packages are for redhat only

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Programming :: C++ Cin Doesn't Wait For Input By Operator

Jan 4, 2010

I am trying to learn C++.I implemented a simple archive program, and I am in a situation in which the user is prompted by a menu to make a choice.So I have some cout instruction to illustrate the possible choices and then

int choice;
cin>>choice;

and everything works fine.I introduced this code in a "while" loop that checks wether the choice made by the user is valid or not:

bool check=true;
int choice;
while(check)
{
cin>>choice;
if(the choice is valid) {...;check=false}
else cout<<"please make an other choice"
}

What is happening is that if by mistake the user introduces a character in place of a number, the loop repeats indefinitely because the program, when it get to the "cin" instruction, does not pauses to wait for a new input.

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Programming :: Print Increment Operator In Perl?

Apr 25, 2010

Can one of you point me towards a comprehensive print function tutorial in perl? I was under the impression that everything within quotes will get interpolated - but I am running into exceptions where it is not desirable to run some varaibles under quotes.

ordinal.pl
1 #!/usr/bin/perl
2 $idx = 1;
3 foreach $letter (a..z) {
4 print "Letter #",$idx++," is: $letter
";
5 #print "Letter # $idx++ is: $letter

[Code]...

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Programming :: Python Equivalent Of C Ternary Operator?

Jun 12, 2010

I've been reading and googling, etc. I've seen some things, but not a definite explanation of this. What is the appropriate way to mimic a C ternary operator using Python? Isn't there an exact proper way to do it? Any difference for using lambda functions? I'm sorry, but I've been searching and it's ambiguous to me how this should be handled. I would appreciate a person's help on this. I came up with this link, but I'm wondering if I'm missing something.[URL]...

So, is that it? In Dive Into Python, it's using the and-or trick. Well, if the above post is the full explanation,

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Programming :: Subscript Operator For A List Class?

Jun 27, 2010

how to overload the subscript operator ([]) for a list class?

Code:
template <typename T>
class list
{
public:
struct node

[Code]...

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Fedora :: Error: Missing Binary Operator Before Token

Oct 26, 2010

I have been spending several days getting wxwidgets to work in code::blocks ide on several different platforms. Now I am down to one instance that I can't figure out. I have wxwidgets working in Fedora 13 x64, but cannot get it to work in a Fedora 13 x32 version. Actually, wxwidgets seem to be installed OK, but I run into compiler errors when I try to compile the default wxhello project. I get quite a few messages, in different header files, of this type:

/usr/include/assert.h:39:42: error: missing binary operator before token "("#if defined __cplusplus && __GNUC_PREREQ (2,95) From my friend Google this would seem to be caused by an older version of boost (before 1.37) - see http://bugs.xmms2.xmms.se/view.php?id=2215 ("It is an issue with old versions of boost and gcc4.4 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36453 It is fixed in boost 1.37")

I did a yum info command on both systems for every relevant package I could think of, including gcc(v4.4.4), gcc-c++(4.4.4), libgcc(4.4.4), libstdc++(4.4.4), boost(1.41.0), wxGTK(2.8.11), wxBase(2.8.11). Both systems are fully updated and have the same versions, with the only difference being 32 vs 64 bit. The same headers compile with no errors on the x64 system, but not x32. I have been able to find no other reason for this error than older versions of the preprocessor, yet that is apparently not the case here).

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Ubuntu :: Invalid Arithmetic Operator - Trying To Take Away Two Numbers With Decimals

Feb 7, 2011

I'm trying to make a bash script that takes away two decimal numbers. This is to work out partitioning information.

Code:

hddsize=`sudo parted -s /dev/sda unit GB print | grep "Disk" | tr -d [A-Z][a-z] | tr -d '/: '`
trimsize="1.5"
partitionendsize=$(($hddsize - $trimsize))

I get an invalid arithmetic operator. Not sure how to minus these two numbers. Is it a floating point issue?

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Programming :: Ostream<< Operator With Double Variable Is Not Accurate?

Mar 27, 2010

I have tryed out this operator on program:

Code:

#include <iostream.h>
#include <iomanip.h>
#include <fstream.h>
ofstream myfile;

[code]...

which definitly is not the same number. I guess somewhere in the convertion from double to char* ("<<") something is not right and what can i do to save these double numbers in an accurate manner in a file?

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Programming :: String Comparison - [: =: Unary Operator Expected?

Nov 23, 2010

I would like to compare the nmlookup result of IP's stored in the file ips with a list of PC names stored in the file pcs.

Code:
for line in `cat "ips"`
do

[code]....

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Programming :: C++: Assignment Operator Copy All The Members Also For Structures Containing STL Objects?

Sep 26, 2010

does the assignment operator copy all the members also for structures containing STL objects strings,vectors,vectors of vectors...)? I did try it on my platform,and it works that way (copying all the fields),but i was wondering if it is a standard behavior or not.

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Programming :: Bash Scripting With "source" Or . (dot) Operator (Cygwin & Ubuntu)?

Jan 22, 2010

This one is driving me crazy.

My .bashrc is set as:
if [ -d ~/.bashrc.d ]; then
for file in $(/bin/ls ~/.bashrc.d/); do

[code]....

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General :: "unary Operator Expected" Error Msg?

Nov 8, 2010

if [ $games -gt 0 ] ; then
echo ""
echo "*** New Game! ***"

[code]....

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Programming :: Change Or Add Paths For The Compiler To Look In When Using The "<>" Operator?

May 12, 2010

My compiler won't find <new>. Since it's such a basic function, I'm a bit confused. Is <new> supposed to be in a file of its own? Where do I find it? And if it turns out to be missing on my computer, where can I find a <new> one? Or do you see anything else that I do wrong?

After some trying out, it seems I can't find stuff like iostream or any other basic stuff either. The compiler is prolly looking for them at the wrong place. Does anyone know how I change or add paths for the compiler to look in when using the "<>" operator?

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