Computer Software


Command-line & Graphical User Interfaces



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Command-line & Graphical User Interfaces

  • Command-line interface systems display a command prompt, then expect the user to type the desired commands.
  • These systems include UNIX, MS-DOS and VMS.
  • Graphical user interfaces (GUI) display pictures (icons), menus, and text, which the user may point to with a mouse or other pointing device, then click to select the desired function.
  • These systems (GUI) include Macintosh OS, Windows 95/98, Windows NT, OS/2 Warp, and Unix with X Windows interface.

Application software

  • Developed for a specific task , such as word processing( MS Word/ WordPerfect), accounting (Lotus 1-2-3/ Excel), or database management (Access/ dBASE).
  • We also use graphics and presentation software.
  • Most applications are purchased on diskette or CD-ROM.
  • They are installed by copying the programs from the diskettes/CD-ROM to the hard disk.

Generations of Computer Languages: Machine Language

  • Machine language was the first generation programming language
  • Machine language: directly understood by a computer since it is a collection of binary numbers (0 and 1).
  • Disadvantages: It is not standardized, different CPU needs different machine languages. Slow and labor-intensive process.

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