c language tutorial | What is C language used for?

 

today so we are going to start C language C language so before going to

discuss about C language nothing but before going to learn one programming

language first of all the two basic questions that every programmer should

understand and of course we should answer so first one is a what is

 What is C language basics?

language what is language and second one what is computer language because we are

going to learn a language so first of all we should know what is a language

and what is computer language so what is the language means is a simple thing a

language is nothing but a set of instructions so generally if you take a

English language you language Hindi language so generally the languages we

are using to communicate if you want to communicate with another person we are

passing instructions using a particular language but while using a language we

 need to follow some of the instructions some rules already they had given so

 what are the rules for example if I want to speak in English I just want to form

 c language tutorial

a sentence to form a sentence first we should be good grammatically we know

 that generally or else we cannot form a sentence we cannot speak in English

 language right in the same way so computer language is also for

 communication sake only is actually why computer language is to

 

communicate with a computer but simply if they ask what is a computer language

 it is also a set of instructions simply set of programs set of programs so that

 will give an application application to understand easily it's a software a

computer language is a software a computer language is a predefined

 c language basics

application right using computer language so what we will do so means we

 will communicate with the system's right we will communicate with some other

 electronic devices in this world so that is actually need of computer language

 what is the need of computer language here need see just consider one person

 

is present generally in this world only one process is there that is called

 communication right here it is I am teaching right nothing but I am

 communicating with you people right if you want to ask any question any query

 you want to pass then you should communicate with me right I am working

 c tutorial

means what I am communicating with my bike I just want to travel from one

 location to another location I am communicating with my mother

 and I am communicating with my father some reasons are there the particular

 purpose is there so communication means something you are getting right so if

 

one person you want to communicate with another person generally they have to

 share information information is nothing but a passing

 instructions for general communication they are using general languages like

 English Telugu Hindi all these languages they will use all these languages but

 

now here the person want to communicate with the machine any electronic machine

 this consider computer the person want to communicate with the machine sir

 question wiser why the person want to communicate with the machine simple

 thing just consider here it is I am asking the question what is the five factorial

 c programming tutorial

everyone can answer easily it's a 120 all right it is a simple calculation

 right 120 suppose if my next question is what is 120 factorial no one can answer

 no one because it's a bit complex operation it's a bit complex operation

 so directly instantly we can tell if I give some time to you so then within

 that time you can calculate and we will but instead of performing complex

 operations manually it is better to

 

interact with the electronic device example take calcium so using calculator

 whatever the number you give as an input fraction of seconds you will get

 downloaded right so that is the complex operations it is better to perform

 manually right so here but the problem is we need to pass instructions in

 

machine code only if I want to communicate with you I am teaching

 something to you why I am using English language

 because all you people understand English language very easily so that is

 basic c programs

the only reason I am using English language in the same way if the person

 want to communicate with the computer the person needs to pass instructions in

 a machine code only in a computer understandable language only

 so what computer understands binary language computer understands binary

 

language can anyone pass instructions in a binary language impossible we cannot

 write applications right in a binary language it's very complex so that's why

 first you have to learn one programming language properly right see using using

 any programming language so many examples C C++ Java dotnet all these are

 simple c programs

programming languages like high level languages first you have to learn one

 programming language all the rules write how to define the instruction set how to

 write a programs everything you should learn perfectly right so once you are

perfect in one programming language right you should be perfect why the

 

reason suppose if I am perfect inEnglish language so then only I can

 interact with you in English language in the same way if you want to communicate

 with the computer using C language first you should learn perfectly C language

 after learning language we are writing programs writing writing programs

 right so programs means a set of instructions a equals to 10 B equals to

 

20 C equals to a plus B and just we are printing C it's a program a simple

 program I have written addition of two numbers sir I don't know how to write

 the program just leave it forget about it this is not the program just looking

 like an English instruction set it's not a C language it's not C++ right so

 

programming language instructions looking like an English statements only

 we are taking two variables nothing but two values and we are adding and

 printing simple this is what we call the source code source code but once a

 source code is ready nothing but once your program is ready using that program

 directly we cannot communicate with the computer it will reject sir wise are

 

already program written using programming language yes but what all

 the instructions you have written so that is in English language computer

 cannot understand English computer understands only binary language that is

 once and zeros only so then what we should do how can we convert that

 English instruction set into binary language already they had given one

 

program for us the program name is

 called compiler program name is called compiler this is a predefined program

 software that was already ready so we should take care about the code that

 what you have written we are responsible for conversion compilers all

 

available so what compiler will do means that converts all these instructions

 into binary language same instructions will convert into binary language now

 machine code is ready so once machine code is ready so that you can pass as an

 input to the computer so that computer will produce the output this is actually

 the process of communication with the computer directly we cannot communicate

 

with the computer why we arecommunicating means to perform complex

 operations in an easy way imagine ATM facility is not available I

 just want to withdraw some amount of money from my account how difficult it

 is right so it is a long process first I have to visit the bank and then so much

 process I have to complete finally I will get the money right suppose if

 

availability machine availability is there right within one minute or two

 minutes you will get wherever you are in this world right you will get the money

 so machines always makes our task very easy so that is the only reason we are

 communicating with the machines right so what direct communication is not allowed

 because we cannot pass instructions in a binary language so first we have to

 

learn one language after learning the language right we are writing programs

and then converting into binary instruction set using compiler and then

communication so that is why after writing the program's are why

compilation is required this is the only reason behind that so this

 

is why right we are using compiler what is an interface what is an interface for

example here the communication process we have already seen communication

process in some of the cases right if you want to interact with the machine no

need to become a programmer right just consider I want to perform a money

transaction from the ATM is it necessary to become a C programmer is it necessary

to become a Java programmer is it

 

necessary to become a dotnet programmer no not required right so not required

simply in some of the cases as an end user also you can communicate with the

machine how that is possible see so I am NOT the programmer but I want to

interact with the machine to perform a particular task so what we should do see

ere suppose so this person is a programmer consider programmer so in

this world along with the programmer one more person is present the person is

 

called end-user our client we are always working for our clients only we are

always working for end-users only we are developing applications for end-users

only here programmers provides interfaces in her face sir what is

interface just consider it's an application ATM application only simple

 

definition of interface we know operating system is an interface right

that is just working like a mediator between

the programmer when end-user and as well as a background application interface

means without having the background details we can perform our tasks see

just consider end user and user end user want to perform one ATM transaction so

 

can communicate can communicate using interfaces how whenever end user enters

into this ATM Center on the screen it will give one message so what is it mrs.

choose one language and here it is a number of options it will give English

Lu Hindi options it will give so for example end user understands English end

user click on English then all the instructions will come in English

language only so what is happening inthe background is not required for the

end user nothing but whenever the end user enter their pin number right our

end user when ever enters how much amount they want to withdraw how it is

communicating with the server machine how it is communicating with a server

machine how it is communicating with the database machine that is not required to

the end user what is happening in the background is not required for the end

user for example so we are driving a car you just want to increase the speed of

the car we will accelerate generally so whenever we accelerate and accelerate

the speed will increase or ematic aliy but what is happening in the background

we don't know and of course that is not required for the driver this speed is

increasing or not that's it if speed is not in

using properly so then directly so we are communicating with another person so

who is called a mechanic so here suppose if end-user trying to perform the

transaction from the ATM if the transaction is successful so then the

end-user leave the ATM center with the money for any reason if transaction has

failed then end-user directly contact the bank management and the bank

management contact programmer because programmer providing interface

programmer providing interface so here as a programmer we are not communicating

with the machines just we are developing applications nothing but we are

providing interfaces by which every end user can easily interact with the

machine so that is our motto right so this is about what is language what is

computer language what is the need of  computer language so finally the main

purpose of computer language is developing applications by which

end-users communicate with the machines

c language tutorial part 2