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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

Blocks and Procedures in ADA

Blocks
A Block in ADA contains two parts specification and a body. The specification specifies the variable used inside the block and the body executes the statement for the block

syntax
block
begin
---
---
end

  • The main purpose of blocks are information hiding.
  • A Variable declared inside a block is accessible only within the block and nowhere outside the block.
Example
var x,y:integer
begin 
  y:=0;
 for x in 1..10 loop
  block
   var x:integer;
    begin 
    for x in 1..5 loop
    y:=y+x;
   end loop;
end;
end loop;

(NB: the above example shows two variables x within the block and outside the block, The x inside the block is accessible only within that block)

Procedures and Functions
  1. Blocks are repeated whenever they are needed, but functions can be written once, called anytimes
Examples
//to define a function to show the smaller among two integers
function SMALLER (A,B: integer) return integer is 
begin
if A < B then
  return A;
else
return B;
end if;
end SMALLER;

//function calling SMALLER
D:=C+SMALLER(x,y);


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