Programming :: Saving A Certain Variable And Using It In All The Classes?
Feb 4, 2010facing a problem in declaring variables. i have a few classes like the one below...
Code:
#ifndef _FINANCE_H
#define_FINANCE_H
[code]....
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Programming :: Reg: C++ Abstract Classes?
Oct 28, 2010I know the basic answer about how to create a class as ABC.But I don;'t know- - why I have to create a AbstractBaseClass. - In what situations it can be used.an example code base and not like a animal(base) and tiger(derived) relationship example.
View 2 Replies View RelatedProgramming :: C++Linking Classes/.cpp Files To Run One After Other?
Apr 11, 2010This is probably a really stupid thing to ask considering the development I'm doing (effectivly creating a virus scanner), but how do I link classes/cpp files?I have 3 applications/sections that I can compile/combine with a makefile, that's fine, but I need them to run 1, 2, 3 once the output from the makefile is done.Currently the only section to actually run is whichever I have "main" in and obviously if I put that into all three, they won't compile as one.I've been looking all over the place at all sorts, header files and such, but there is no mention of how toually do this although I'm sure it must be possible. I'm used to being able to do this in Java and I'm sure I've seen C++ applications do it, but not worked out how.I have 3x .cpp files which are combined into one using a makefile:
Code:
# Virus Scanner
scanner.out : ProgramList.o MD5Hash.o HazardCheck.o
[code]...
Programming :: Possible To Have A Templated C++ Stl Containers In Classes?
Feb 15, 2010Is it possible to have a templated c++ stl container in another class without specifying the type prior to compile time? I haven't coded in c++ in a while and im at a total loss.
For example - Not real code. Just outlining the problem code...
Programming :: Child Classes That Extend Each Type Of Pet
Jan 6, 2011I am fairly new to c++. There must be a better way to do the following?:- Say I have a base class, Pet. I have several child classes that extend from this, like Dog, Cat, Fish etc.
I have the following function, that returns a pointer to a new Pet:-
Code: Pet* addPetToVet()
{ //Do some stuff
return new Pet();
} This will return a pointer an instance of a pet object.
Now, if I want to interpret this pet as a dog or cat I have to do this:-
Code: Dog* dogA = static_cast<Dog*>(addPetToVet());
Cat* catA = static_cast<Cat*>(addPetToVet()); Is there a way around this? Casting seems lame. I cant write a function for each type of pet.
Programming :: Java : Use Dynamically Loaded Classes?
May 15, 2010I'm new to Java.
I'm trying to use some dynamically loaded classes in my application.
The application doesn't know those classes , Just it try to load a class by name that its name came from input.
It doesn't know class (So I can't use casting) but just needs to call some methods of that class (every class should have that methods).
I thought about interfaces but I don't know how.
How can I call those methods?
General :: Saving A Content Of Files(contain Location To A Directories) Into Variable?
Nov 22, 2010#the file temp contain a path to a directory int the first line
a= `head -1 temp`
bash: /home/ram/linuxTraining/scripting/testDir/test1Dir/test2Dir: is a directory
Programming :: [c++] Mixing Abstract Classes And Multiple Inheritance?
Apr 18, 2011Why are the 'defense' method calls actually using the 'offense' methods.Also, is there a way to remove the commented base classes for 'Player' so that the casting isn't necessary?
Code:
#include <iostream>
class Offense
[code]...
Programming :: Equivalence Classes Based On Field Values And Multi-key Hashtable?
May 12, 2010I've got a set of objects (all of the same type). I'm trying to think of a good way to divide it into equivalence classes, with equivalence of two objects defined as meaning a specified set of attributes are equal for both objects. More concretely, I've got:
- a Java class with around 50 fields
- a bunch of instances of the class
I want:
- to divide the instances into a few sets
- in each set, each instance has field 1 - field 5 equal to fields 1-5 of the other instances in the set.
The method I've come up with is to generate a hashcode for each instance based on the hashcodes of fields 1-5*, and map the hashcode to one of my sets. Ignoring problems with potential hashcode collisions (which I'm expecting to be too rare to worry about for now), does that sound reasonable? It seems simple enough, but I'm wondering if there's a simpler method I haven't thought of.
* I'll generate the hashcode using a method based on Eclipse's generic hashcode method, which looks like this:
Code:
public int hashCode() {
final int prime = 31;
int result = 1;
[code]....
Programming :: Bash - Read Content Of File To Variable And Use This Variable In For Loop ?
Aug 21, 2009I'm trying to read content of file to variable and use this variable in for loop. The problem is, when I have c++ comment style in file - /*. Spaces in line are also interpreted as separated lines.
For example:
Code:
Changing $files to "$files" eliminate these problems but causes that whole content of variable is treated as one string (one execution of loop).
Programming :: Make A New Variable With The String From The Old Variable Btut Without Any Plus Sign?
Apr 7, 2010my script has a variable which comes in the form +00.00 +0.00 -00.00 or -0.00 (the numbers can be any in that form) for any that have a + symbol I need to remove the +, but if it has a - symbol it needs to stay.
i need to make a new variable with the string from the old variable btut without any plus sign. I have tried a lot of different ways with no success, each thing I tried either left the + or removed the entire string. I think this should work but doesn't
foo=+12.40
bar=${foo#+}
Programming :: Search Within A Variable And Assign The Results To A New Variable?
Apr 25, 2011how I can search within a variable and assign the results to a new variable. I'll use the following as an example -
cars="Audi BMW Cadillac Chevy Dodge Ferrari Ford Mercedes"
list=`echo ${cars} | egrep -o '<A?+|<C+'`
with the echo command I get the following output assigned to list -
A
C
C
What I'd like to get for output is -
Audi
Cadillac
Chevy
how I could do this regardless of upper/lower case letters?
Programming :: Assign Value Of C Variable To Shell Variable?
Apr 28, 2010included shell script inside c program, and i wanted to assign the value of c variable to shell variable..Can any one please suggest me how to do it?
View 8 Replies View RelatedProgramming :: Assignment To A Variable Variable?
Mar 17, 2011This loop is part of a bash script which takes multiple arguments.
Code:
for ((i=1;i<=$number;++i)) ; do
offset=$(($i+5))
[code]...
Programming :: Pass Variable In Mysql Qyery In C Programming?
Dec 4, 2010i want to pass variable in mysql qyery in c programming
View 1 Replies View RelatedUbuntu :: Saving Current Programming Before Upgrading?
Jun 7, 2011I am writing this because I want to keep all of the things that I have now on my ubuntu 10.
4 computer and do not want to upgrade until I have some way of keeping all of the things that I currently have on it.Sohow so I make this happen? Should I try to load these program settings on a flash drive?
Programming :: Evaluating Bash Script Without Saving ?
Sep 5, 2010I blame myself but I am lazy person. Now I am trying to learn a bit a bash scripting. But saving any script to see how it works is so boring. You know these exercises:
Code:
Now save this in a file - say helloworld.sh (haha), chmod and execute to see
Code:
Is there a way to execute text as a script? I mean
Code:
Programming :: Python ConfigParser Not Saving Comments?
Jun 16, 2011I have a lot of scripts in Bash and am 'converting' one of them to Python just to get to know how Python works. Up to now I'm loving it, the feel, the logic, the power, ...
1. I have a template file which will be filled in by a technician, meaning it's filled with comments (#) and variable = value combinations, where the technician needs to fill in the values needed under the section referring to the configuration he's performing. 2. After installing from DVD/ISO, the software RPMs get installed and there is a default configuration file containing variable = value combinations where the values need to be changed to the values indicated in the template file mentioned in 1.
In order to do this I played around (and Googled a lot) with ConfigParser. I can load the template, get whatever value I need, load the configuration file, set the new value to the correct variable and write the file.
I checked that the template and configuration files loaded (open()) contain everything, including comments. However when I write the configuration file all comments get lost.
Here's what I have so far: Class to create a fakesection header since ConfigParser needs sections and the configuration file doesn't have those.
Code:
class FakeSectionHead(object):
def __init__(self, fd):
self.fd = fd
[Code]....
Programming :: Saving Serializable Object Within It's Own Class
May 12, 2011I found out how to save an object using Serializable in JAVA, the standard however how can I set up my MainVariableList to have a function/method saveobject so it saves the object within it's own class, the below code compiles, however when I run it reports an error on startup but works, basically what do I use for the red line, how do I tell it what object is passed to the class?
View 1 Replies View RelatedProgramming :: Mistake With Sed Espression Is Saving Part Of Pattern?
Jan 20, 2010got a textfile with : as delimiters in between fields. e.g.1:2:3:4:5:6Thomas Cruise:Johnavid:Peter:Betty:JaneThe names may or may not contain white spaces.I am required to substitute any one of these names in the file with a new one inputted by user.e.g. to change John to Johnny, David to Beckham, etc. without touching any of the other names in the same line. Just one at a time.So here's the sed expression I was trying out with:
sed -i "s/<(.:.:)David>/$1Beckham/" names.txt
I also tried:
sed -i "s/<(.*)David>/<1Beckham>/" names.txt
[code]....
Programming :: Saving A PPM File - Binary Representation Of Unsigned Chars On The Harddrive
Apr 7, 2010I am accessing a firewire camera using the libdc1394 library and saving the image as a PPM file, using the code below:
[Code].....
My question is whether the above code is portable. I presume it is, since the result is a binary PPM file which should be capable of being read across multiple computers with different architectures and different operating systems. But at the same time, all that the above code is doing is just saving the binary representation of unsigned chars on the harddrive, and there does not seem to be any reason why the binary representations of the unsigned chars will be identical across multiple computers.
Programming :: Saving File Data Using Python In An Embedded System In An Safe And Fast Way?
Apr 19, 2011I am developing a program in a system where the Linux does not take care of the sync command automatically. So I have to run it from my application always I save some data in the disk, which in my case is a 2GB sdcard. It is true that I can make the operation system takes care of the syncronization, using a proper mount option, but in this case the programm's performance drops drastically. In particular I use the shelve module from Python to save data that comes from a socket/TCP connection and I have to deal with the potencial risk of the system being turned off suddenly Initially I wrote something like that to save data using shelve:
Code:
def saveData(vo)
fd = shelve.open( 'fileName' , 'c')
fd[ key ] = vo
fd.close()
os.system("sync")
But that takes too much time to save the data. Note that I use the sync from the OS every time I close a file to prevent data corruption in the case of the "computer" being turned off with data even in the buffer. To improve the performance I made something like that:
Code:
def saveListData( list )
fd = shelve.open('file_name', 'c')
for itemVo in list:
fd[itemVo.key] = itemVo
fd.close()
os.system("sync")
Thus, first I saved an amount of objects in a list then I open the file and save the objects. In this way I have to open the file just one time to save a lot of objects.However I would like to know if adding a lot of objects before closing the file would increase the risk of data corruption.I known that turning off the system after fd.close() and before os.sync may cause problems. But what about turning off the system after
Code:
fd = shelve.open('file_name', 'c')
but before fd.close()?
Programming :: Sed A Variable In Bash?
Mar 25, 2011I have beat this enough and don't get what should have been a very simple thing to do. I build a variable;
Code:
CLIST=java,lua,python,php,perl,ruby,tcl
CLIST will be used by another bash script but I need to replace the commas with a space. I
[code]...
Programming :: C++ Get Variable Name From Document Name?
Apr 9, 2010How would I go about defining a variable from a document name. Example:document01.doc I want to take the 01 and set X to equal integer 1.
View 1 Replies View RelatedProgramming :: Defining Variable With Sed?
Jun 2, 2010I need to replace JAVA_OPTS= with JAVA_OPTS=<some_value>.I need to give "" value at the end of the replacement. I have tried with the following but it is not working: sed -e "s|JAVA_OPTS= |JAVA_OPTS=<some_value>"
View 2 Replies View RelatedProgramming :: Can Awk Take A Shell Variable
Jul 23, 2010I have been searching most of today and am stuck on getting a variable into an awk portion of my bash script. I have this working:
Code:
#!/bin/sh
SRC=/var/log/mail.log
DEST=/var/www/output/myFile.txt
VAR=userName@myDomain.tld
[code]....
Can awk take a shell variable? Or do I have to do something completely different?
Programming :: C++ Variable Type Followed By *?
Jul 1, 2010In C++ what does the suffix, "*" mean appended to a variable type, e.g., "char* variable1;"?
View 3 Replies View RelatedProgramming :: Initializing A Variable In C?
Nov 5, 2010Following is the way I saw a variable initialized in C
Code:
static const unsigned int rtl8139_rx_config =
RxCfgRcv64K |
(RX_FIFO_THRESH << RxCfgFIFOShift) |
(RX_DMA_BURST << RxCfgDMAShift);
on following link
[URL]
I have initialized variables in past but above initialization I could not understand what is it?
Programming :: Print Variable Value In Awk?
May 16, 2011problem statement:
pattern_search="Exam Name"
sed -n "/$pattern_search/,/hello/"p tmp5 | awk '{if ( $4 != 0 && $4 ~ /[0-9]+.*[0-9]*/ ) print "$pattern_search" " " $0 }'
"tmp5" is a file. this is printing output as
$pattern_search value1
i.e value of $pattern_search is not getting substituted. i am expecting output as
Exam Name value1
Programming :: Retrieving Value From Variable
Feb 5, 2010how shall I print each variable separately using a generalized form. I tried writing the following within a for loop...Code:echo $(echo a$(echo $i)$(echo $j))which did yield no result. So what shall I write??
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