Ahmed Ghazey

Al Salmo Aliko . Hello, in this post I'll discuss with you how to design good Entity Relationship Diagram ERD . this article for: IT Students learning about database. you are having difficulties in creating ERD. you are developer that need help in database design.   let's ask ourselves Why good database design is good ? or why we need ERD?         when I started programming Eng / Eman Ahmed was my First teacher, she said you must write your code with pen, and now I told you good database design start with paper and pen or in technological terms start with ERD, ERD is the model which shows logical layout of your database. let's List some advantages of good database design : very low or no redundant data is stored.  supporting planed or unplanned queries. good design easy to maintain and modify. from first glance you can understand it. an ERD consist from Entities and relationships between them; there exist...

I faced many problems when installing OpenCV on eclipse, so I decide write this tutorial . I'll explain steps in Order : 1- Open eclipse create new empty project (C or C++ project). 2- make sure that  "MinGW"  toolchain is selected . 3- press next . 4- right click on project -> properties . 5-Under "C/C++build "  section select -> setting , then select "tool setting " tab, Then select the "Includes" folder (on older versions of eclipse it is the "Directories" folder) in the GCC Compiler branch and add the opencv include directory to Include paths (-I): "C:\OpenCV2.1\include\opencv\", of course you have to change the directory if you install OpenCV in another place. 6- Now, under the MinGW Linker select the "Libraries" folder and add the following to the Libraries (-l) section (note not all of these are necessarily needed for your project but these are all the libraries available in opencv. cv2...

SA I write this post because I failed yesterday to solve the topcoder TCO 250 problem , it was about find the LCM -Least Common multiple -simply it is smallest number which accept the division on - non zero - numbers . how we calculate it? there exist two ways lets discuss both: for example 3,4,6 first way find the multiple of all numbers 2,3,4...etc. Multiples of 2: 4,6,8,10, 12 ,14,16. Multiples of 3: 6,9, 12 ,15. Multiples of 4: 8, 12 ,16,20. as you see 12 is the smallest common number which appear on all numbers . second way factor each number into it prime component and do the following steps : 1-Count the number of times each prime number appears in each of the factorizations. 2-For each prime number, take the largest of these counts. 3-Write down that prime number as many times as you counted for it in step 2. 4-The least common multiple is the product of all the prime numbers written down. example 5,6,15. Factor into primes Prime facto...

Hi this is my first technical post , really i find this topic very interesting and i like it . actually I worked now on good project which utilize my Genetic algorithms , neural networks and parallel computing knowledge . when searching i hit in this topic . pointers to function : who should read this article are computer science students and programing Students introduction :  you can write good code without knowing any thing about pointers , but if you used pointers you will write all your codes with pointers , it is best invention after electricity , it will attract you , and you will feel the infinite happiness  . what is pointer ? you know int , float , double you can think on this data type as box which contain some value . but pointers is different it stores the reference of this value -memory address - then you can access the value in this pointer by dereference it . declare pointer int *ptr; dereference pointer *ptr ; but take care you have to assign value...