Networking Devices

Networking Devices are components used to connect computers or other devices together so that they can share files or resources like printers .Devices may be used to setup a LAN network or in connecting different LAN Networks.


1.Network Interface Card(Lan Adapter):

2.Hub:

3.Switches:

4.Router:

5.Bridges:

6.Host:

7.Repeaters:

8.Modem:

Pythagorean Triplets Java

A Pythagorean Triplet is a set of 3 values a, b and c such that the sum of squares of a and b is equal to  square of c.
(a*a) + (b*b)  = (c*c)
Following Program Displays the Pythagorean Triplets upto a user desired value.

import java.util.Scanner;
public class Triplets {
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        int a, b, c;
        System.out.println("Enter the value of n: ");
        int n = in.nextInt();
        System.out.println("Pythagorean Triplets upto " + n + " are:\n");
        for (a = 1; a <= n; a++) {
            for (b = a; b <= n; b++) {
                for (c = 1; c <= n; c++) {
                    if (a * a + b * b == c * c) {
                        System.out.print(a + ", " + b + ", " + c);
                        System.out.println();
                    }
                   
                    else
                        continue;                  
                }
            }
        }
    }
}

Inclusion Exclusion Principle

Inclusion Exclusion Principle is Used to Calculate Cardinality of Union or Intersection of Sets

For Example:
n(a or b)=n(a)+n(b)-n(a&b)

Following Code will calculate the Intersection of Sets Using Inclusion Exclusion Principle

Code:

//Program to Calculate Cardinality of Intersection of sets Using Inclusion Exclusion Principle
import java.util.*;
public class IncExcP 
{
    public static void main(String[] nt) 
    {
        Scanner in=new Scanner (System.in);
        System.out.print("Enter Number of sets: ");
        int n=in.nextInt();
        int [][] s=new int[n][];
        System.out.println("Enter Cardinality Type Wise (i.e:Singles,Pairs,Triples etc): ");
        for(int i=1;i<n;i++)
        {  s[i]=new int[choose(n,i)];
            for(int j=0;j<choose(n,i);j++)
            {
                s[i][j]=in.nextInt();
            }
            if(i==n-1)
            {
                break;
            }
            System.out.println("Enter Next Type");
        }
        System.out.print("Enter Value of Union:");
        int u=in.nextInt();
        int [] sum=new int[n];
        for(int i=1;i<n;i++)
        {
            for(int j=0;j<choose(n,i);j++)
            {
                sum[i]=sum[i]+s[i][j];
            }
        }
        int x=u;
        for(int i=1;i<n;i=i+2)
        {
            x=x-sum[i];
        }
        for(int i=2;i<n;i=i+2)
        {
            x=x+sum[i];
        }
        if(n%2==0)
        {
            x=-x;
        }
        System.out.println("Intersection: "+x);
    }
    public static int choose(int n,int i)
    {   int result=1;
        for(int j=1;j<=i;j++)
        {
            result=result*(n-j+1)/j;
        }
        return result;
    }
}

Output:
For example:

Telephone Database (Persistent Variables) Python

Following Code will help in maintaining a telephone database including following commands

1.whois phonenumber -tell the details of a particular Number

2. add phonenumber information-add the new number with the information

3.search keyword-return all numbers having keyword in their information

4.delete-deleting any number from database

5.quit-Halt the application

Code::

import string
import shelve

database=shelve.open("information.db")
print("Commands are: whois,add,search,delete or quit")
c=0
line=input("Command: ")
while line!='quit':
    words=line.lower().split()
    if line=="":
        print("Commands are: whois,add,search,delete or quit")
    elif words[0] =='whois':
        if words[1] in database:
            print(words[1],":",string.capwords(database[words[1]]))
        else:
            print("Not Found Try again!!")
    elif words[0]=='add':
        if words[1] in database:
            print("Already Present")
        else:
            database[words[1]]=" ".join(words[2:])
    elif words[0]=='search':
        for e in database:
            if database[e].find(words[1])!=-1:
                c=1
                print(e,":",string.capwords(database[e]))
                
        if c==0:
            print("Keyword Not found Try again!!")
    elif words[0]=="delete":
        if words[1] in database:del database[words[1]]
        else:print("Not Found Try again!!")
    else:
        print("Command Not Found Please Try again!!")
    line=input("Command: ")
database.close()

Output::

 

A Concordance Python

A concordance is an alphabetical listing of the words in a text String,along with the line numbers on which each word occurs.

Code::

def count(line,dct,linenumber):
    for word in line.split():
        lst=dct.get(word,[])
        lst.append(linenumber)
        dct[word]=lst

line=input("Enter text,quit to end: ")
linenumber=0
dct={}
while line!='quit':
    linenumber+=1
    count(line,dct,linenumber)
    line=input()
for el in sorted(dct.keys()):
    print(el,":",dct[el])

Output::

Tabulating Club Dues Python

Following Code will tabulate the dues of Members of Club :

Code::

def main():
    fre={}
    print("Enter Dues ,enter quit to end")
    while True:
        line=input()
        if(line=='quit'):break
        words=line.split(':')
        fre[words[0]]=fre.get(words[0],0)+int(words[1])
    for name in fre:
        print(name+" has Paid Rs",fre[name],"in dues")

main()

Output::

Word Frequency Python

Following code will give the frequency of occurrence of words in text:

Code::

def main():
    fre={}
    print("Enter Text ,enter quit to end the text")
    while True:
        line=input()
        if(line=='quit'):break
        for el in line.split():
            fre[el]=fre.get(el,0)+1
    print (fre)

main()

    
Output::