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Client Server Architecture

December 25, 2019

CLIENT SERVER ARCHITECTURE Client/server architecture is a computing model in which the server hosts, delivers and manages most of the resources and services to be consumed by the client. This type of architecture has one or more client computers connected to a central server over a network or internet connection. Client server application consists of multiple application system combines or divided but interlinked to make various layers or tier The application logic tier. The application logic tier is where all the “thinking” happens, and it knows what is allowed by your application and what is possible, and it makes other decisions. This logic tier is also the one that writes and reads data into the data tier. The data tier. The data tier is where all the data used in your application are stored. You can securely store data on this tier, do transaction, and even search through volumes and volumes of data in a matte...

Heap Sort

December 21, 2019

Heap Sort A heap is a nearly complete binary tree with the following two properties: Structural property: all levels are full, except possibly the last one, which is filled from left to right Order (heap) property: for any node x, Parent(x) ≥ x Array Representation of Heaps A heap can be stored as an array A. Root of tree is A[1] Left child of A[i] = A[2i] Right child of A[i] = A[2i + 1] Parent of A[i] = A[ i/2 ] Heapsize[A] ≤ length[A] The elements in the subarray A[( ⌊ n/2 ⌋ +1) .. n] are leaves Max-heaps (largest element at root), have the max-heap property: for all nodes i, excluding the root: A[PARENT(i)] ≥ A[i] Min-heaps (smallest element at root), have the min-heap property: for all nodes i, excluding the root: A[PARENT(i)] ≤ A[i] Adding/Deleting Nodes New nodes are always inserted at the bottom level (left to right) and nodes are removed from the bottom level (right to left). Operat...

C Program For Heap Sort | C Programming

December 20, 2019

Heap A heap is a complete tree with an ordering-relation R holding between each node and its descendant. Note that the complete tree here means tree can miss only rightmost part of the bottom level. R can be smaller-than, bigger-than. E.g. Heap with degree 2 and R is “bigger than”. Heap Sort Build a heap from the given set (O(n)) time, then repeatedly remove the elements from the heap (O(n log n)). Implementation Heaps are implemented by using arrays. Insertion and deletion of an element takes O(log n) time. More on this later Heap Sort Pseudo Code Heapsort ( A ) { BuildHeap ( A ) for i <- length (A) downto 2 { exchange A [ 1 ] <-> A [i] heapsize <- heapsize - 1 Heapify (A, 1 ) } BuildHeap (A) { heapsize <- length (A) for i <- floor ( length/ 2 ) downto 1 Heapify (A, i) } ...

C Program For Caesar Cipher [Encryption & Decryption] | C Programming

December 18, 2019

Caesar Cipher The Caesar cipher is one of the earliest known and simplest ciphers. It is a type of substitution cipher in which each letter in the plaintext is 'shifted' a certain number of places down the alphabet. For example, with a shift of 1, A would be replaced by B, B would become C, and so on. The method is named after Julius Caesar, who apparently used it to communicate with his generals. More complex encryption schemes such as the Vigenère cipher employ the Caesar cipher as one element of the encryption process. The widely known ROT13 'encryption' is simply a Caesar cipher with an offset of 13. The Caesar cipher offers essentially no communication security, and it will be shown that it can be easily broken even by hand. C Program For Caesar Cipher [Encryption] #include <stdio.h> int main () { char msg [ 100 ], ch; int i,key; printf ( "Enter a plaintext \n " ); gets (msg); ...

C Program For Chi-Square Test | C Programming

December 17, 2019

Chi-Square Test • Formalizes this notion of distribution fit – O i represents the number of observed data values in the i -th interval. – p i is the probability of a data value falling in the i -th interval under the hypothesized distribution. – So we would expect to observe E i = np i , if we have n observations So the chi-squared statistic is • So the hypotheses are – H 0 : the random variable, X , conforms to the distributional assumption with parameters given by the parameter estimates. – H 1 : the random variable does not conform. C Program For Chi-Square Test #include<stdio.h> int main() { int n,i,e,calc=0,z=16.9; ...

C Program To Sort The Words In Alphabetical Order | C Programming

December 16, 2019

C Program To Sort The Words In Alphabetical Order #include <stdio.h> #include <string.h> int main () { int i , j , n ; char str [ 25 ][ 25 ], temp [ 25 ]; puts ( "How many strings you are going to enter?: " ); scanf ( " %d " , & n ); puts ( "Enter Strings one by one: " ); for ( i = 0 ; i <= n ; i ++) { gets ( str [ i ]); } for ( i = 0 ; i <= n ; i ++) for ( j = i + 1 ; j <= n ; j ++) { if ( strcmp ( str [ i ], str [ j ]) > 0 ) { strcpy ( temp , str [ i ]); strcpy ( str [ i ], str [ j ]); ...

Implementation Of Mono Alphabetic Cipher Encryption-Decryption

December 11, 2019

Mono Alphabetic Cipher Encryption-Decryption Introduction It is Better than Caesar Cipher. If, instead the “cipher” line can be any permutation of the key 26 alphabetic characters, then there are 26! Or greater than 4 * 10 26 possible keys. This is 10 orders of magnitude greater than the key space for DES and would seem to as a Mono-alphabetic substitution cipher, because a single cipher alphabet is used per message. There is however, another line of attack. If one analytically knows the nature of the plain text, then the analyst can exploit the regularities of the language. Limitations Monoalphabetic ciphers are easy to break because they reflect the frequency data of the original alphabet. A countermeasure is to provide multiple substitutes, known as homophones, for a single letter C Progrm to Encryp the imputed text using Mono Alphabetic Cipher. #include <stdio.h> #include <string.h> int main () { char pt [ 52 ] = { 'A' , 'B' , 'C' , ...

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