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Installing ns-3.37 and ns-3.35 in Ubuntu | Ubuntu 22.04 | NS3

Multiple Versions of ns3 in Ubuntu 22.04 In this post, we are going to install two versions of ns3 namely ns-3.35 and ns-3.37  My OS is : Ubuntu 22.04 LTS (Long Term Support) ns-3.35 uses waf and (./waf --run scratch/first)  ns-3.37 uses cmake  (./ns3 run scratch/first.cc) So we will install both the packages  Go through the video for complete instructions To start with  $ sudo apt update  $ sudo apt install build-essential autoconf automake libxmu-dev g++ python3 python3-dev pkg-config sqlite3 cmake python3-setuptools git qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar gsl-bin libgsl-dev libgslcblas0 wireshark tcpdump sqlite sqlite3 libsqlite3-dev  libxml2 libxml2-dev libc6-dev libc6-dev-i386 libclang-dev llvm-dev automake python3-pip libxml2 libxml2-dev libboost-all-dev  I have downloaded both the versions of ns3 fr

Packages in ADA

Benefits of Packages
  1. Packages can be compiled, debugged independently
  2. software maintenance is very easier
  3. Once package is developed, they can be made accessible to everyone who has access to it.
  4. packages provide more security                                                                                                            
Packages contains two parts 1) a specification and 2) a body
Specification interfaces to the outside world.
body contains the executable statements associated with the functions

Examples of packages includ, COMPLEX NUMBERS Calculations, Creation of TIMER and CLOCK using packages and made as a library

Example
//Package specification describes the functions and variables relevant to complex number and their addition and subtraction operations

package COMPLEX_NUMBER is
type COMPLEX is 
record
 real, imag:float;
end record;
function ADD(a,b:COMPLEX) return COMPLEX;
function SUB(a,b:COMPLEX) return COMPLEX;
end COMPLEX_NUMBER;

//Paackage body will implement the function specified in the package specification

package body  COMPLEX_NUMBER is
with ROOTS; //ROOTS is also a package and now used as alibrary
use ROOTS;
with TRIGONO;
use TRIGONO;

begin 
function ADD(a,b:COMPLEX) return COMPLEX is 
return((a.real+b.real,a.imag+b.imag));
end ADD;
function SUB(a,b:COMPLEX) return COMPLEX is 
return((a.real-b.real,a.imag-b.imag));
end SUB;

end COMPLEX_NUMBER;

//Package COMPLEX_NUMBER made available as a library

with COMPLEX_NUMBER;  //retrieve the COMPLEX_NUMBER package
package CMPLXUSE is 
use COMPLEX_NUMBER; //make package available to the procedure
a:COMPLEX:=(2,3);
b:COMPLEX:=(2,3);
c:COMPLEX;
begin 
c:=ADD(a,b);
c:=SUB(a,b);
end CMPLXUSE;


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