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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

Functions in C

Almost all the programming languages uses functions. Functions are the entities which are grouping a set of statements which do a specific job or set of jobs.

Example: sum of integers, sum of float number, complex number addition.

All the above three can be implemented as a single function or three separate functions.

When someone wants to use that, a function can be simply called.

So function implementation happens as

  • Function prototype or Function declaration
  • Function definition or function implementation
  • Function call

Function prototype

  • It is necessary to specify the name of the function, the parameters and the return type to the compiler that the function is being defined in this program.
  • The prototype ends with a semicolon

syntax:

int sum(int, int); //function prototype

Function Definition

This is the actual function definition which shows the function implementation.

for the above syntax here is the function

int sum(int a, int b)

{

int c;

c=a+b;

return c;

}

The above function is returning an integer, hence int is specified. If a function is not returning any thing, a void can be used.

Function call

The last is the function call, which when being needed a simple call will make the function to work. Here is the example

int main()

{

int x,y,z;

scanf(“%d %d”,&x,&y);

z=sum(x,y); //function call

printf(“The sum is %d”, z);

return 0;

}

Once the function is called, the control goes to the actual implementation and execute the statements inside the function and the value is returned to the main function.

Components of a function

  1. Name of the function
  2. Return type
  3. Parameters or arguments

In the above example

name of the function is : sum()

return type is : int

parameters are: int, int

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