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Practical approach to Object Oriented Programming by 13745 on Wed Apr 01, 2015 1:57 pm


Object-oriented programming:-
Object-oriented programming language (OOPL) is a high-level programming language based on the object-oriented programming (OOP) model.
OOPL incorporates logical classes, objects, methods, relationships and other processes with the design of software and applications.
Example:-
1.Java
2.C language
3.C++
4.Smalltalk
5.PHP etc.

Brief History:-
SIMULA was the first object language. As its name suggests it was used to create simulations.It was developed by Kristen Nygaard and Ole-Johan Dahl in Norway.
The term "object oriented programming " was first used by Xerox PARC in their Smalltalk programming language.The idea of object-oriented programming gained momentum in...

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What a programmer should know about memory? by 13745 on Tue Mar 31, 2015 4:07 pm
Memory:
The computer memory is a temporary storage area. It holds the data and instructions that the Central Processing Unit (CPU) needs. Before a program can be run, the program is loaded from some storage medium into the memory. This allows the CPU direct access to the program. Memory is a need for any computer.
Types:-
Memory is primarily of three types.
a) Cache Memory
b) Primary Memory/Main Memory
c) Secondary Memory

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Types of scheduler by affiaaslam on Tue Mar 31, 2015 6:46 pm
Scheduler:
Scheduling is referring to set of policies and mechanism to control the work which is performed by a computer system. Of all the resources in a computer
System that is scheduled before use, the CPU is by far the most important.
Multi programming is the (efficient) scheduling of the cpu. In multi programming systems, when there is more than one run able process. the operating
system must decide which one to activate. The decision is made by the part of the operating system which is called scheduler, using a scheduling algorithm. The first Scheduling algorithm is Non-preemptive First-Come-First-Served (FCFS) and Shortest Job first (SJF) which is Good for ‘ ‘background’ ’ batch jobs..and second algorithm preemptive[ which includes • Round-Robin (RR) and . Priority which is Good for ‘ ‘foreground’ ’interactive jobs. The scheduler is concerned with deciding policy, not providing a mechanism. A scheduler is designed to select one or more primary performance criteria. One pro...

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خونی چاندوں کی نمود، صہیونیوں کا پانچ صدیوں سے انتظار غلام محی ا by UCERD.COM on Wed Oct 08, 2014 4:24 pm
زمیں، سورج اور مریخ ایک ہی قطار میں آ جاتے ہیں۔ اس ترتیب کے نتیجے میں چاند کا رنگ خون کی طرح سرخ ہو جاتا ہے۔ فوٹو: فائل
Image
اسلام آباد: سالِ رواں کے آغاز میں جب ماہرین فلکیات نے پیش گوئی کی کہ 15 اپریل سے آسمان پرسرخ چاند گرہن کا آغاز ہونے والا ہے تو ساتھ ہی کار پوریٹ عالمی میڈیا میں نجوم کے ماہرین کے بیانات بھی آنے لگے۔

ان کا کہنا ہے کہ اس طرح کا گرہن اس وقت وقوع پذیر ہوتا ہے جب زمیں، سورج اور مریخ ایک ہی قطار میں آ جاتے ہیں۔ اس ترتیب کے نتیجے میں چاند کا رنگ خون کی طرح سرخ ہو جاتا ہے۔ بعض لوگ اس طرح کی خونی رنگت والے چاند کے نظارے کو دنیا کے خاتمے اور حضرت عیسیٰ ؑ کے ظہور کی نشانی قرار دیتے ہیں لیکن ایسے گرہن کے بعد جب چاند سرخ ہو جاتا ہے تو اہل یہود اس کو دنیا کی بادشاہت حاصل ہونے کی سنہری نوید قرار دیتے ہیں۔ خونی چاند گرہن مکمل چاند گرہن کو کہا جاتا ہے۔

امریکی خلائی ادارے ناسا نے بھی سال 2014 اور 2015 میں ’’بلڈ مون‘‘...


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Introduction to Operating System by 13745 on Mon Mar 30, 2015 1:58 pm
Introduction to Operating system

OPERATING SYSTEM:

Definition:-
Operating system is software that works as an interface between a user and the computer hardware.

Example:-
There are following some examples of OS.
a) UNIX
b) LINUX
c) MS-DOS
d) MS WINDOWS -98/XP/Vista
e) Windows NT/2000,
f) Window 7 & 8 etc.



Explanation:-
•OS performs the basics tasks such as receiving input from keyboard, processing instructions and sending output to the screen.
•OS manages overall activities of computer and input/output devices attached to it.
•It is software that is required in order to run application programs and utilities.
•It works as a bridge to perform better interaction between application programs and hardware of computer.
•It manages t...

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