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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

C Programming - Introduction

This post and the subsequent posts will help you in understanding the intricacies of C programming. These posts just shows you the basics of C programming and some worked examples for that. 
C
C Program with Linux

Features of C Programming
  • C is a small language having lesser number of keywords than Java or pascal.
  • C is a native language of Unix, Linux. Not only that many of the windows packages, database programs, graphics libraries are written in C program
  • C is portable – it provides standard set of libraries that work on the same way with all machines
  • C is modular, as it supports functions to divide the program in to sub program
  • C is efficient on most machines, because certain constructs are machine dependant.
Structure of a C program
  • Comments
    • the comments are usually ignored by the compiler
    • so this part informs about the author of the program
    • what is the usefulness of this program
    • updation or creation of the program
    • Example: //  - Single line comment
    • /* ----- multi line comments    ….*/
  • Preprocessor Directives
    • before the compiler runs, the preprocessing takes place.
    • the preprocessors are prefix with a symbol #
    • Examples: #include, #define, #ifdef, #pragma, etc.
  • Function prototypes
    • This is to inform the compiler that the following functions are defined in this program.
    • it specifies the name of the function, arguments or parameters and return type and it ends with a semicolon
    • Ex: int sum(int,int);
  • Global Variables
    • Global variables which are declared above all the functions
    • As the name says, they are available to all the functions of that program
    • They are usually stored in the RAM
  • Main Function
    • main is the function which is main to the entire program
    • Every C program should have a main function
    • syntax: int main() { }
    • Earlier, the main program will return nothing, ie void, but now the compilers are instructing us to provide a return type for the main() function
  • User defined functions
    • After the main() function, the user defined functions are defined, as per the function prototype declared in the program
    • The function can be defined above the main function also, in that case there is not need for function prototype
    • Syntax:
int sum(int a, int b)
{
int f;
f=a+b;
return f;
}

 T S Pradeep Kumar

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