Solutions and tutorials for IT&C development
Data structures implemented in C/C++
When processing binary values it is very difficult to read or to display them because any printing function generates a String value. The problem with this approach is that not all byte values can be interpreted as a printable char (i.e. the 0 binary value represents the NUL symbol; for more details check ASCII Codes […]
Read More →Functiile de prelucrare in matrice sunt acele functii care fac diferite operatii matematice, operatii de interschimbare, numarare, modificare, stergere, inlocuire asupra elementelor unei matrice modificând-o in cele mai multe cazuri. Toate aceste functii sunt diferite intre ele, nu numai prin ceea ce fac ele, ci si prin parametrii care ii primesc sau prin valorile returnate. […]
Read More →The comparison functions used for matrix processing are needed for finding more information about a matrix or group of matrices from the point of view of: the matrix type, its elements type or the apparition number of a key in the matrix. The function symmet checks if a matrix is a square or a symmetrical […]
Read More →Postfix writing (Reverse Polish Form) was made by Polish mathematician Jan Łukasiewicz. Particularities of this form of writing mathematical expressions are presented in […]. An algorithm for transforming a writing mathematical expressions from infix to postfix writing was developed by Edsger Dijkstra (Dijkstra Shunting Algorithm). Algorithm requires:
Read More →Postfix writing […] is a form of representation of mathematical expressions in which arithmetic operatorsare written specified by operands.Advantages of postfix writing over prefix and infix writing: Highlights clear policy of making operations; Brackets for forcing priority for implementing operators are not necessary; Evaluations are easily performed by computer. Algorithm for evaluation of an expression […]
Read More →To realize a real computation of matrices it must exist in the first place the matrix or the matrices. Having created an inadequate object for work with it, the results would be unexpected. Therefore we must pay the necessary attention to those functions that are creating a matrix. In this way we won’t have any […]
Read More →Library source: C and C++ library of functions and procedures for matrix processing Language: C / C++Date: 04.2002Authors: Catalin Boja si Niculescu SilviuLicense: Creative Commons Attribution 3.0 License This post main objective is to tackle a series of aspects regarding the creation of a library that contains functions necessary in resolving the problems with matrices. […]
Read More →Stack is a logical data structure, its implementation in physical memory being made by using other data structures.The components of the stack data structure have the same data type, which means that the stack is a homogeneous data structure.There are two basic operations with stack: adding and removal of an item.Manner of implementation for operations […]
Read More →Using DLL ensure productivity and/or financial gain in the software development process by reusing the source code written C++. Routines and/or programming components included in a DLL are referenced in the application without the need of their re-implementation in these applications. To build a DLL in C++ programming language as Visual Studio 2008 project, it […]
Read More →Memory allocation at the applications run-time enables the use of a storage space, expressed in number of bytes, having the size of heap memory required for data storing defined by the variables. Compile-time allocation allows the reservation and use of storage space with predefined size expressed in number of bytes. In this situation, software developers […]
Read More →In C++ programming language, memory areas can be accessed indirectly through pointer type variable […]. Also, available with a memory address, it ensures movement on memory areas from the memory address stored in the variable pointer. This is ensured by arithmetic operators and it is called arithmetic of pointers. Depending on the nature of arithmetic […]
Read More →Areas of heap memory are accessed via variables of pointer type […]. This kind of variable manages values of memory address type. Arithmetic of pointers […] involves the operators use to access the areas of heap memory. Allocating of heap memory areas is done by functions and/or operators implemented in programming language. In the below […]
Read More →The pointer type variables allow the accessing of memory areas with numerical content for the management of the values which represent memory addresses. The dimension of a pointer variable depends on the processor architecture.In the C++ programming language, the definition template of a pointer variable is:
Read More →The usage of the programming elements included in DLL’s […] it is made in C++ applications by respecting the rules stated below.The usage of a DLL in the C++ programming language in the Visual Studio programming environment, it is made in the following way: Create a C++ project – type: Console application; Define the content […]
Read More →The storage structures for sparse matrixes are presented at […].The simply linked list is a linear data structure, formed by elements called nodes. A node is composed by two categories of fields: The field with the information necessary for processing; The field with the information for connecting with the successor node in the simply linked […]
Read More →The sparse matrix represents a special type of two-dimensional array consisting of a large number of elements from out of which a very high proportion is occupied by null elements. Thus, the classical declaration of a two-dimensional array in the C++ programming language leads to unnecessary use of memory by storing null values and of […]
Read More →Structurile de stocare a matricelor rare sunt prezentate la […].Lista simpla este o structura de date liniara, formata din elemente denumite noduri. Un nod este compus din doua categorii de campuri: Campul cu informatia necesara prelucrarii; Campul cu informatia de legatura cu nodul succesor in cadrul structurii de tip lista simpla; se defineste sub forma […]
Read More →Matricea rara reprezinta in tip special de masiv dimensional format dintr-un numar foarte mare de elemente din care o pondere foarte mare o ocupa elementele nule. Astfel, declararea clasica a unui masiv bidimensional in limbajul C++ conduce la utilizarea inutila a memoriei prin stocarea valorilor nule si a capacitatii de procesare. Declararea unei structuri de […]
Read More →In limbajul de programare C++, zonele de memorie pot fi accesate indirect prin variabile de tip pointer […]. De asemenea, avand la dispozitie o adresa de memorie, se asigura deplasarea pe zona de memorie pornind de la adresa stocata in variabila pointer. Acest lucru se asigura prin operatori aritmetici si poarta denumirea de aritmetica de […]
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