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Introduction to Programming with C# / Java Books » Chapter 1. Introduction to Programming. In this chapter we will take a look at the basic programming terminology and we will write our first C# program.
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We will familiarize ourselves with programming – what it means and its connection to computers and programming languages. Briefly, we will review the different stages of software development.
We will introduce the C# language, the . NET platform and the different Microsoft technologies used in software development. We will examine what tools we need to program in C#. We will use the C# language to write our first computer program, compile and run it from the command line as well as from Microsoft Visual Studio integrated development environment. We will review the MSDN Library – the documentation of the .
NET Framework. It will help us with our exploration of the features of the platform and the language. Content. Video. Presentation. Mind Maps. Nowadays computers have become irreplaceable. We use them to solve complex problems at the workplace, look for driving directions, have fun and communicate. They have countless applications in the business world, the entertainment industry, telecommunications and finance.
It’s not an over. In reality, it is not the computers, but the programs (the software), which run on them, that matter. It is the software that makes computers valuable to the end- user, allowing for many different types of services that change our lives. How Do Computers Process Information? In order to understand what it means to program, we can roughly compare a computer and its operating system to a large factory with all its workshops, warehouses and transportation. This rough comparison makes it easier to imagine the level of complexity present in a contemporary computer. There are many processes running on a computer, and they represent the workshops and production lines in a factory.
The hard drive, along with the files on it, and the operating memory (RAM) represent the warehouses, and the different protocols are the transportation systems, which provide the input and output of information. The different types of products made in a factory come from different workshops.
They use raw materials from the warehouses and store the completed goods back in them. The raw materials are transported to the warehouses by the suppliers and the completed product is transported from the warehouses to the outlets. To accomplish this, different types of transportation are used. Raw materials enter the factory, go through different stages of processing and leave the factory transformed into products.
Each factory converts the raw materials into a product ready for consumption. The computer is a machine for information processing. Unlike the factory in our comparison, for the computer, the raw material and the product are the same thing – information.
In most cases, the input information is taken from any of the warehouses (files or RAM), to where it has been previously transported. Afterwards, it is processed by one or more processes and it comes out modified as a new product. Web based applications serve as a prime example. They use HTTP to transfer raw materials and products, and information processing usually has to do with extracting content from a database and preparing it for visualization in the form of HTML. Managing the Computer. The whole process of manufacturing products in a factory has many levels of management. The separate machines and assembly lines have operators, the workshops have managers and the factory as a whole is run by general executives.
Every one of them controls processes on a different level. The machine operators serve on the lowest level – they control the machines with buttons and levers. The next level is reserved for the workshop managers. And on the highest level, the general executives manage the different aspects of the manufacturing processes in the factory. They do that by issuing orders. It is the same with computers and software – they have many levels of management and control.
The lowest level is managed by the processor and its registries (this is accomplished by using machine programs at a low level) – we can compare it to controlling the machines in the workshops. The different responsibilities of the operating system (Windows 7 for example), like the file system, peripheral devices, users and communication protocols, are controlled at a higher level – we can compare it to the management of the different workshops and departments in the factory. At the highest level, we can find the application software. It runs a whole ensemble of processes, which require a huge amount of processor operations. This is the level of the general executives, who run the whole factory in order to maximize the utilization of the resources and to produce quality results. The Essence of Programming. The essence of programming is to control the work of the computer on all levels.
This is done with the help of . These commands (instructions) are given in written form and are implicitly followed by the computer (respectively by the operating system, the CPU and the peripheral devices).
To “program” means writing sequences of instructions in order to organize the work of the computer to perform something. These sequences of instructions are called “computer programs” or “scripts”. Statutorily Sealed Case File In Connecticut How Much Can A Landlord. A sequence of steps to achieve complete some work or obtain some result is called an algorithm. This is how programming is related to algorithms.
Programming involves describing what you want the computer to do by a sequence of steps, by algorithms. Programmers are the people who create these instructions, which control computers. These instructions are called programs. Numerous programs exist, and they are created using different kinds of programming languages. Each language is oriented towards controlling the computer on a different level.
There are languages oriented towards the machine level (the lowest) – Assembler for example. Others are most useful at the system level (interacting with the operating system), like C. There are also high level languages used to create application programs. Such languages include C#, Java, C++, PHP, Visual Basic, Python, Ruby, Perl, Java.
Script and others. In this book we will take a look at the C# programming language – a modern high level language. When a programmer uses C#, he gives commands in high level, like from the position of a general executive in a factory. The instructions given in the form of programs written in C# can access and control almost all computer resources directly or via the operating system. Before we learn how to write simple C# programs, let’s take a good look at the different stages of software development, because programming, despite being the most important stage, is not the only one.
Writing software can be a very complex and time consuming task, involving a whole team of software engineers and other specialists. As a result, many methods and practices, which make the life of programmers easier, have emerged. All they have in common is that the development of each software product goes through several different stages: - Gathering the requirements for the product and creating a task; - Planning and preparing the architecture and design; - Implementation (includes the writing of program code); - Product trials (testing); - Deployment and exploitation; - Support. Implementation, testing, deployment and support are mostly accomplished using programming. Gathering the Requirements.
In the beginning, only the idea for a certain product exists. It includes a list of requirements, which define actions by the user and the computer. In the general case, these actions make already existing activities easier – calculating salaries, calculating ballistic trajectories or searching for the shortest route on Google maps are some examples.