Hasannor M. Mandi Mustapha Sultansarip Jhun Fred Somosa Jill Marie Panugan

1. SOFTWARE
Hasannor M. Mandi
Mustapha Sultansarip
Jhun Fred Somosa
Jill Marie Panugan

2.  Computer hardware would be useless without
software, the lists of instructions which tell the
hardware what to do.
 Computers require various types of software to
make them useful. These can be classified as
follows:
1. Operating System
2. Applications software

3.  When choosing software it is important to examine
the system requirements to make sure that the
software will run on the hardware.
 System requirements will typically include details on:
 MEMORY
- How much RAM is required for the software.
 STORAGE requirements
- How much Hard Disk space is required for the software.
 OS compatibility
- which operating system it requires.

4.  Application software
 Easy to use programs designed to perform specific
tasks
 System software
 Programs that support the execution and
development of other programs
 Two major types
▪ Operating systems
▪ Translation systems (compilers & linkers)

5. Copyright © 2000 by Brooks/Cole Publishing Company
A division of International Thomson Publishing Inc.

6.  Application software makes computer popular and easy to
use
 Common application software:
 MicrosoftWord,WordPerfect
 PowerPoint
 Netscape, Internet Explorer
 PhotoShop, Photo-Paint
 QuickTime
 Dreamweaver

7.  Controls and manages the computing resources
 Examples
 Windows, Unix, MSDOS,
 Important services that an operating system
provides:
 Security: prevent unauthorized users from accessing the
system
 Commands to manipulate the file system
 Input and output on a variety of devices
 Window management

8.  A program needs to be written in a language
 There are many programming languages
 Low-level, understandable by a computer
 High-level, needs a translator!
 C++ is a high level programming language
A sequence of instructions
A program
(in computer language)
An algorthm
(in human language)

9.  Machine binary language: unintelligible
 Low-level assembly language
 Mnemonic names for machine operations
 Explicit manipulation of memory addresses
 Machine-dependent
 High-level language
 Readable
 Machine-independent

10. Machine binary language Low-level assembly High-level

11. Examples of compilers:
 MicrosoftVisual C++, Eclipse, g++
A program written in high-level programming language
(for example, C++ program)
A low-level (machine language) program that is
understandable by a computer (for example, a PC)
COMPILER (for example, Visual C++)

12.  Set of programs used to develop software
 Types of translators:
Compiler
Linker
 Examples
 MicrosoftVisual C++, Eclipse, g++

13.  Major activities
 Editing (writing the program)
 Compiling (creates .obj file)
 Linking with compiled files (creates .exe file)
▪ Object files
▪ Library modules
 Loading and executing
 Testing the program
Compile
Link
Library routines
Other object files
Think
Edit
Load
Execute
Source Program

14.  Combine all of the capabilities that a programmer would
want while developing software (VC++ 2008, Eclipse)
 Editor
 Compiler
 Linker
 Loader
 Debugger
 Viewer

15. // a simple program
#include <iostream>
using namespace std;
int main() {
cout << "Hello world!" << endl;
return 0;
}
Print
statement
Ends execution
of main() which ends
program
Comments
Function
named
main()
indicates
start of
program