Basic programming

Basic programming

• 1.
  Submitted by: Nicole DanielleMallari Keith Alison Arellano
• 2.
   Importance ofcomputers  What is a computer?  Computer Programs  Programming Languages
• 3.
   Arithmetic Operations Comparison (logical) operations  Storage & retrieval operations  Speed & Accuracy
• 4.
   Hardware  SystemUnit  CPU – control unit & arithmetic logic unit  Main Memory  Peripheral Devices  Input  Output
• 5.
   Secondary Storage Floppy disk, hard drive, CD, DVD, Flash Drive  Secondary Storage Devices  Used to copy data to & from secondary storage  Storage space measured in Bytes  Kilobyte, Megabyte, Gigabyte, Terabyte
• 6.
  Supercomputers Mainframes Minicomputers Microcomputers
• 7.
   Operating System User Interface  Command-Line Interface  Graphical User Interface  DOS – Disk Operating System  Command-line  Used to run QBasic
• 8.
   Designed fromthe BASIC language  Enhanced, menu-driven  Online Help  Structured language
• 9.
   Installed onyour H: drive  Double click on QB.exe  Use mouse and arrow keys to navigate  Menu Bar  File - Edit  View - Search  Run - Debug  Options - Help
• 10.
   Title Bar Reference Bar  Immediate Window
• 12.
  Demonstration
• 13.
   File  New Open  Save  Save As  Print  Exit
• 14.
   View  SUBs Split  Output Screen  Run  Start  Restart  Continue
• 15.
   Use CLSto clear screen at beginning  Type commands one line at a time  Hit Enter to go to next line  Scroll up & down as needed
• 16.
   CLS  INPUT PRINT  Put text in “double quotes”  Use semi-colon ; between quoted text & variable names  Use $ for text variables  User$, Instructor$, Title$
• 17.
   Computer Ethics Hardware  Backup data  Store media properly  Software  Commercial Software  Shareware  Public-domain Software
• 18.
   There arealso special functions called “commands” (also called “instructions”). A “command” tells that the Qbasic interpreter to do something. The PRINT command tells the Qbasic interpreter to print something to the screen. In this case, the interpreter printed “Hello World ! “. TIP: Instead of typing PRINT, you can enter a question mark. For example: ?”Hello World!”
• 19.
  With the PRINTcommand, you can also print numbers to the screen. Delete the current program (unless you already have) and write the following: PRINT 512 (or ?512) <press Enter> Press F5 to run the program, the program outputs: 512
• 20.
   An expressionis something the interpreter calculates (or evaluates). Such us: 1 + 1 (returns 2) 100 – 47 (returns 53) 3 * 34 (returns 102) 80 / 4 (returns 20) (100 * 3) + (returns 356)
• 21.
  CLS - An abbreviationthat stands for the words Clear Screen . In the above program, when you used CLS on line 60, all the words that were printed to the screen were wiped away. PRINT - Writes the screen. There are commands to other things like printer, but that’s to be discussed later. Each new Print command will start printing on a new line. To insert a blank line, don’t specify a string to print. The syntax for “PRINT” is PRINT “[whatever you want to be here]”
• 22.
  END - It stopsthe program at that line; that is, anything that’s added after that won’t show. That’s why the PRINT command on line 90 didn’t print anything. The END command can be included in control structures to end the program if a condition is met. This will be discussed with control structures. Given the state of computer speed today you should not see the paragraph displayed by lines 20 through 50, it should be cleared by the CLS statement on Line 60 before you have a chance to see it.
• 23.
  An operator isa code element that performs an operation on one or more code elements that hold values. Value elements include variables, constants, literals, properties, returns from function and operator procedures and expressions. An expression is a series of value elements combined with operators which yields a new value. The operators act on the value elements by performing calculations, comparisons or other operations.
• 24.
  Visual Basic providesthe following types of operators:  Arithmetic Operators perform familiar calculations on numeric values, including shifting their bit patterns.  Comparison Operators Compare two expressions and return a boolean value representing the result of the comparison.  Concatenation operators join multiple strings into single string.  Logical and Bitwise Operators in Visual Basic combine Boolean or numeric values and return a result of the same data type as the values.