Skip to main content

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

String handling functions in C

Like numbered arrays, C handles character arrays (strings).

  1. Each string is identified as a character array and ends with a ‘\0’(null) character (the compiler automatically adds the null character). So the end of string is identified as a null character.
  2. Being an array, all the elements of the string array stored in continuous memory locations

following is the declaration of character array

char name[50];

or

char name[]=”Pradeep Kumar”;

or

char name[20]=”Hello Pradeep”;

Strings can be handled or manipulated through loops or library functions. There are some library functions to handle strings are available at string.h

Some of them are

strlen(string) 

  • This is to find the length of the string and returns an integer
  • For example, if “Hello” is the string, the length will be 5 and “Hello “, the length is 6 (there is a blank space after o in hello)

strcat(String1, string2)

  • to concatenate two strings
  • One string will be appended to another string (the concatenation happens by inserting the new string at the null character ‘\0’ of the first string)
  • Example, if String1 is “Hello” and String2 is “Pradeep”, then strcat(string1, string2) will be “HelloPradeep”
  • Similarly,  if String1 is “Hello ” and String2 is “Pradeep”, then strcat(string1, string2) will be “Hello Pradeep”

strcpy(Destination, source)

  • This function is to copy one string to other
  • usually the copying string will be the 2nd parameter and copied string will be the first parameter
  • Example, if string1 is “Bad” and string2 is “Good” the strcpy(string1,string2) will give Good for string1

strcmp(Destination, source)

  • This function is to compare two strings whether they are equal or not
  • like numbers, two strings should not be compared directly like if(a==b)
  • If both the strings are equal, the function returns 0, else it will return the difference of ASCII value of the first non matching characters
  • Example, strcmp(“Their”, “There”) will return ASCII(i) – ASCII(r) (an integer will be returned)

Example Program

//program to demonstrate string handling functions
#include <stdio.h>
#include <conio.h>
int main()
{
    char a[50];
    char b[50];
    printf("Please the two strings one by one\n");
    gets(a);
    gets(b);
    printf("Length of String a is %d \n",strlen(a));
    printf("Length of String b is %d \n",strlen(b));
    if(!strcmp(a,b))  //Comparing two string will return 0, ! before strcmp() is needed
    printf("Both the strings are Equal");
    else
    printf("Both the strings are not equal");
    strcat(a,b);  //Concatenation function
    printf("the concatenated String is:");
    puts(a);
    strrev(a);
    printf("The reverse string is\n");
    puts(a);
    getch();
    return 0;
}
   
   

In the above program , instead of gets() function, scanf() can be used, but the disadvantage of scanf() being it truncates the blank space, new line, form feed, tab.

So for example, if the input give is “Hello pradeep”, then Hello only will be accepted, the string after the blank space will be omitted by the compiler, so gets() can be used.

Similarly, puts() or printf() can be used to display strings.

Comments

Popular posts from this blog

Installation of NS2 (ns-2.35) in Ubuntu 20.04

Installation of NS2 (ns-2.35) in Ubuntu 20.04 LTS Step 1: Install the basic libraries like      $] sudo apt install build-essential autoconf automake libxmu-dev Step 2: install gcc-4.8 and g++-4.8 open the file using sudo mode $] sudo nano /etc/apt/sources.list Include the following line deb http://in.archive.ubuntu.com/ubuntu bionic main universe $] sudo apt update $] sudo apt install gcc-4.8 g++-4.8 Step 3:  Unzip the ns2 packages to home folder $] tar zxvf ns-allinone-2.35.tar.gz $] cd ns-allinone-2.35/ns-2.35 Modify the following make files. ~ns-2.35/Makefile.in Change @CC@ to gcc-4.8 change @CXX@ to g++-4.8 ~nam-1.15/Makefile.in ~xgraph-12.2/Makefile.in ~otcl-1.14/Makefile.in Change in all places  @CC@ to gcc-4.8 @CPP@ or @CXX@ to g++-4.8 open the file: ~ns-2.35/linkstate/ls.h Change at the Line no 137  void eraseAll() { erase(baseMap::begin(), baseMap::end()); } to This void eraseAll() { this->erase(baseMap::begin(), baseMap::end()); } All changes made Step 4: Open a new termi

Installing ns3 in Ubuntu 22.04 | Complete Instructions

In this post, we are going to see how to install ns-3.36.1 in Ubuntu 22.04. You can follow the video for complete details Tools used in this simulation: NS3 version ns-3.36.1  OS Used: Ubuntu 22.04 LTS Installation of NS3 (ns-3.36.1) There are some changes in the ns3 installation procedure and the dependencies. So open a terminal and issue the following commands Step 1:  Prerequisites $ sudo apt update In the following packages, all the required dependencies are taken care and you can install all these packages for the complete use of ns3. $ sudo apt install 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-

VPL Jail Server Installation | Virtual Programming Laboratory with Moodle

Virtual Programming Laboratory (VPL)  This post tells you how to install VPL Jail Server Installation in Ubuntu 20.04 and how to configure it using Moodle Learning Management System. VPL - Virtual Programming Laboratory  For full installation with complete description, follow the video What is VPL? VPL is Virtual Programming Laboratory which is a tool for programming assignments, evaluation and running of programs. The programming languages supported by VPL is C, C++, Java, Python, Perl, PHP, NodeJS, Verilog, etc. Step 1 - Install  VPN Jail Server Installation  My Server configuration  16GB RAM and 16 Core PRocessor (Intel Xeon)  Virtual Machine  Ubuntu 20.04 (64 bit OS). To download the softwares  https://vpl.dis.ulpgc.es/index.php/home/download  Unzip or untar the above file in the home folder (in my case it is /home/tspradeepkumar/ ) $ cd vpl-jail-system-2.7.2/ $ sudo ./install-vpl-sh VPL Jail Server Installation This will take some time based on your internet connection: To Star