Informatics Practices Class 12 English

  CBSE Class 12 Informatics Practices Revision Notes Chapter -2 Advanced Programming Development Methodology 1. What is a system? A System is a collection of elements or components that are organized for a common purpose. System Software :  System software is a type of computer program that is designed to run a computer’s hardware and application software. The operating system (OS) is the best-known example of system software. The OS manages all the other programs in a computer. 2. Steps in SDLC(Software Development Life Cycle):   SDLC is a process that consists of a series of planned activities to develop or alter the Software Products. Software Development Life Cycle (SDLC) is a process used by the software industry to design, develop and test high quality softwares. a) Planning and Requirement Analysis b) Feasibility study c) Designing the Product Architecture d) System analysis e) System design f) Coding g) Testing h) Implementation and maintenance...

  CBSE Class 12 Informatics Practices Revision Notes Chapter - 4 Visual Basic Revision Tour Intrinsic Controls in Visual basic The visual basic 6.0 provides some standard controls on its control box which are known as intrinsic control. These are built-in controls and are contained in Visual basic .EXE file. These are different from the extrinsic controls (ActiveX objects and Insertable objects) in the sense that they always reside in the control toolbox, while the others are required to be inserted through the components. TOOL BOX The following table is describing the basic controls, their functionality, naming conventions and some important properties and commonly used methods. The letters in ITALICS show the methods generally used with these properties. Describing the intrinsic control S. No. Control Naming Convention Important properties Functionality 1. Picture Box Pic Borderstyle, picture, autosize LoadPicture() Displays a graphic from a bitmap, icon or metafile. 2. Labe...

  CBSE Class 12 Informatics Practices Revision Notes Chapter - 5 Visual Basic Control Structures CONTROL FLOW:  Control structures allow you to regulate the flow of your program's execution. Using control structures, you can write Visual Basic code that makes decisions or that repeats actions. 1) SEQUENTIAL: It means the statements are being executed sequentially. All statments is executed by one by one.  This represents default flow of statements. 2) SELECTION (Decision construct) Selection construct select their course of action depending upon the result of a condition's or Boolean expression's. VB compiler firslty check condition if condition is true statment 1 is executed other statement 2 is executed. 3) ITERATION (Repetition)/ Looping: Iteration means repetition of a set-of-statement depending upon a condition test. A loop is a set of statements that are repeated a certain number of times. The block of statements written in between the loop gets execu...