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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

Arrays in C

Arrays in C programming starts with memory addresses. Yes the compiler handles arrays as memory addresses.

  • Similar elements group together with a single name is called array
  • the indexing always starts with 0 and ends at n-1 (if the size of the array is n)
  • Array elements stores in consecutive memory location.

The array elements usually stores in consecutive memory location. For example,

int a[10];  //Array with size 10

the above example is an integer array with size 10 or this array can hold 10 variables.

The elements starts from a[0], a[1], a[2]…..a[9], so totally there are 10 elements.

Array elements values memory address location
a[0] 32 600AH  (This address is called as the base address)
a[1] 34 600EH
a[2] 23 6012H
a[3] 35 6016H
a[4] 45 601AH
a[5] 67 601EH
a[6] 56 6022H
a[7] 1 6026H
a[8] 34 602AH
a[9] 25 602EH

The memory addresses shown above are in hexadecimal, that’s why each address suffixed with a letter H. The memory addresses in each machine will be different.

The base address is the address where the first element of the array is stored. Usually it is represented as &a[0] or simply a.

The entire array is represented as an address by specifying the base address alone to various other elements of C programming like passing array to functions involves sending the base address only.

For the above table, here is the declaration syntax

int a[10]={32,34,23,35,45,67,56,1,34,25};

or

int a[]={32,34,23,35,45,67,56,1,34,25};

A simple program to get some numbers and print them on the screen

int main()

{

int a[10], j; //declaration of array “a” and its index j

printf(“Enter all the 10 numbers”);

for(j=0;j<10;j++) //get the numbers using a for loop which executes for 10 times (0 to 9)

{

scanf(“%d”, &a[j]);

}

for(j=0;j<10;j++) //print the numbers using a for loop which executes for 10 times (0 to 9)

{

printf(“%d”,a[j]);

}

return 0;

}

In the above example, j varies from 0 to 9 which means the loop will execute 10 times for the array a like this

a[j] when j=0 then a[0]

a[j] when j=1 then a[1]

a[j] when j=2 then a[2]…. and so on

like this the input is entered through the keyboard and same for printing the output.

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