## Binary Number System

The Computer system understands only Binary Number System . And therefore, we need to communicate with the computer only using Binary Code

The binary code is also alternately referred as machine language or machine code. In binary number system, all the number are represented by using only two numeric numbers that is either 0 ( zero ) or 1 ( one ).

All computer programs written in any high level programming language must be first converted into machine code in binaryÂ that can be directly executed by theÂ computer’s central processing unit – CPU.Â

In this lesson,Â we will discuss in detail and find the answers to some important topics in binary number system.

These questions include , why computer understands only Binary code, why binary codeÂ consist of only two numbers that is 0 ( zero ) and 1 ( one ) , different types of number systems , what are logic gates and Boolean algebra.

## How Computer Works ?

### Binary Numbers System

### Table Of Contents

### Binary Numbers System And Logic Gates

### Interview Questions

- What Is Binary Number System ?
- What are different types Number Systems ?
- Why Computer System Use Only Binary Number System ?
- Why Computer Programs are Compiled ?
- How Data Is Represented In Binary ?
- Binary Code And Binary Units
- Binary Number And Logic Gates
- Binary Number And Boolean Algebra

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## What Is Number System ?

We are all familiar with the commonly used numerical number system ( Decimal Number System that makes use of digits from 0 to 9 ) Â that we all use in our daily life.Â

However, there are many Â number system exist that can be used while communicating with the computer system and supported by most computer programming languages .

AÂ Â numberingÂ systemÂ isÂ aÂ systemÂ followedÂ to define aÂ set ofÂ values Â usedÂ toÂ measureÂ aÂ quantity Â .Â WithÂ the help of numberingÂ system , weÂ can expressÂ theÂ quantitativeÂ Â dimension Â ofÂ anyÂ object.Â

For example , to express weightÂ 75 kg , Age as 26 Years , Distance as 100 KM and so on.

However, due to its system hardware architecture of the computer system, the commonly used decimal numerical number system is not suitable.

Due to computer hardware architecture constrains, the decimal system cannot be implemented for the functioning of the computer system.

## Types Of Number System

A number system is defined as a system that allows to represent any number using a set of combination of symbols, digits and alphabets. The CPU of the computer system can interpret and execute only machine code instructions in Binary .Â

And therefore , all program code in any language must be converted to machine code in binary with the help of compiler . However , most programming languages support these four number system while writing a program code.

### Binary Number System

A Binary number system makes use ofÂ only two digits that is **0 and 1**. In Binary Number system any number is represented by using only two digits that is 0 and 1 .

The Â binary number system has base of 2, because it has only two digits to represent any number.

### Octal Number System

The Octal number system makes use of Â only eight ( 8 ) digits from 0 to 7 to represent any number. In Octal number system any number ( value ) can be represented with combination of any 8 digits ( 0,1,2,3,4,5,6, 7 ).Â

The octal number system has a base of Â 8, because it has only 8 digits to represent any number

### Decimal Number System

The Decimal number system is the most commonly used number system which makes use of ten ( 10 ) digits from 0 to 9 to represent any number.Â

In decimal system any number can be represented with the combination ofÂ 10 digits ( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ). The decimal number system has a base of 10, because it has Â 10 digits to represent any number

### Hexadecimal Number System

The Hexadecimal number system has sixteen ( 16 ) alphanumeric values from **0 to 9** and A to F to represent any number.Â

The Hexadecimal number system makes use of Â nine ( 10 ) digits ( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 )and seven ( 6 ) alphabets ( A, B, C, D, E, F ) to represent any number in this number system.Â

The hexadecimal number system has a base of 16, because it makes use of 16 alphanumeric values.

## Binary Number System

InÂ mathematics Â andÂ digital electronics , a binary number is a number expressed usingÂ binary numeral notation system or base – 2 numeral system .Â

The binary number system Â represents any numeric values byÂ using combination ofÂ onlyÂ twoÂ possibleÂ valuesÂ that isÂ Â 0 ( zero )Â Â andÂ Â Â 1 ( one ) . In digital electronics thisÂ isÂ bestÂ suitedÂ toÂ representÂ twoÂ Â statesÂ ONÂ Â orÂ OFF .

TheÂ Binary number system uses only two digits to represent any number Â . Because of its straightforward implementation in digital electronic circuitry using logic gates, the binary system is usedÂ internally by almost all modernÂ computersÂ andÂ Â computer-basedÂ devices.

And thereforeÂ , computer systemÂ isÂ aÂ digitalÂ electronic deviceÂ which can understand and execute program instructions communicated in terms of twoÂ Â statesÂ ONÂ Â orÂ OFF Â . These two states can be best represented using binary number system.

## Why Computer Use Binary Number System

The computers were invented due to their high computing ability . The computers are used to process large volumes of data at lightning speed . The computer system consist of number of components .Â

Each of these component perform a specific task . One of the most important component in a computer systemÂ is CPU.

The CPU ( Central Processing Unit ) within a computer system is responsible to perform all the arithmetic calculations and logical decisions.Â

The CPU is also referred as microprocessor Or processor chip Or simply as processor.

The processor chip consist ofÂ millions of tiny electronic component called Transistor . The transistor is a fundamental building block for all digital electronic gadgets including computers.

The transistor is made-up of silicon which is a semiconductor material . The transistors are used as a micro switch that can be either switched ON or switched OFF .Â

The computerâ€™s Â processor , which is the brain of the computer system consist of millions of these transistors .Â

And hence , the computer processor can understand and execute instructions communicated in the form of only two states that is switch on Or off.Â Â

And therefore , to communicate with computer system , we need a number system that is capable of representing any number using only two digits .Â

The binary number system perfectly fits in to this condition because in binary number system we make use of only two digits that is 0 and 1.

In Binary , the switched ON state is represented **1** ( one ) and the switched OFF state is represented by **0** ( zero ) .Â

And for this reason computer architecture supports binary number system and all computer programs must be first compiled into machine code instructions in binary which computer CPU can execute.

## Why Computer Use Binary Number System

## How Data Represented In Binary

The Computer stores all information and program data only in binary digital form. That means all the data be it text, photographs, audio , video or whatever else is comprised ofÂ onlyÂ collectionsÂ Â ofÂ ones Â andÂ Â zeroes.Â

However , the operating system presents this data in a graphical format in GUI environment which is human readable.

## Binary Code And Binary Units

Since the computer CPU can execute only machine code instructions and operate on the data in binary , All theÂ programÂ codeÂ andÂ the data must beÂ representedÂ in the binary form .Â

The CPU operatesÂ on the data Â andÂ theÂ result Â ofÂ this operation can beÂ sentÂ to either output device ( monitor , printerÂ etc )Â orÂ itÂ can be storedÂ inÂ aÂ permanentÂ storageÂ device for future use.

TheÂ fundamentalÂ building block of digital information is the binary digit or bit, which represents a single 0 ( zero )Â or 1 ( one ) state. This is represented by a bit in computer memoryÂ which is the smallest memory unit.

To represent a large amount of Â data , the bits can be organized into groups of four , eight , sixteen , 32Â orÂ 64 bits , calledÂ nybbles / nibble , bytes , words, long words and very long wordsÂ respectively. These areÂ referredÂ asÂ binaryÂ unitsÂ ofÂ measurement .

TheÂ computers recognize only two discrete states : on andÂ off. These states can be represented by two digits , Â 0Â and 1 . Â Each 0 or 1 is called a bit in the binary system. AÂ Bit is the Â smallest unit of data a computer can process.Â

AÂ Bit is a short for binary digit. The binary system has a base of 2 with the two digits ( 0 and 1 ). By using combinations of 0s and 1s weÂ canÂ represent larger numbers.

## Binary Number And Logic Gates

TheÂ computer system performs different jobs by Â Â executing Â the programÂ instructions as per the program logicÂ . The CPU Â isÂ theÂ mainÂ Â componentÂ inside a computer systemÂ which performs all arithmeticÂ calculationsÂ andÂ alsoÂ Â logicalÂ operationsÂ .

The Computer CPU is responsible to perform both arithmetic calculation and logical operations. TheÂ CPUÂ isÂ made-up ofÂ millionsÂ of tiny circuitsÂ calledÂ transistorsÂ which can function as micro switch .Â

The logic gates areÂ constructed by using transistorsÂ insideÂ aÂ processor chipÂ Â mainlyÂ usedÂ Â byÂ Â the CPUÂ Â toÂ performÂ Â logical operationsÂ .

The computers are digital machines and logic gates are the basic components in digital electronics. The Logic gatesÂ are used to create digital circuits and even complex integrated circuits.

The computer’s CPU consist of millions these tiny circuits which enable the CPU to perform the logical operations.Â Â Â Â

The processor works by reacting to an input of 0s and 1s in specific mannerÂ and then returning an output based on theÂ decision.Â

The decision itself happens in a circuit called a logic gate, each of which requires at least one transistor, with the inputs and outputs arranged differentlyÂ forÂ different operations.

## Binary Number And Boolean Algebra

In mathematics and mathematical logic , Boolean algebra is the branch of algebra in which the values of the variables are the truth values (Â *true* and *false *)Â and this is usuallyÂ denotedÂ in Â binaryÂ Â 1Â andÂ 0Â respectively.

The Boolean algebra was introduced by George Boole in 1854Â who was a BritishÂ Mathematician .Boolean algebra has beenÂ fundamental in the development of digital electronics .

In algebra we make use of decimal numbers , whereas the Boolean algebra usesÂ truth values , true ( 1 ) and false ( 0 ).

A logic gate is a tiny circuitÂ used in processors for making a logical decision whichÂ is based on Boolean algebra .Â

Boolean Algebra is used to analyze and simplify the digital ( logic ) circuits. It uses only the binary numbers i.e. 0 and 1. ItÂ isÂ also calledÂ as Binary Algebra Â orÂ Logical Algebra.

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