Learn Programming Technique C to Master Skills - About Main function and other syntax - video Dailymotion

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00:00Hello everyone, today I'm going to explain the syntaxes of the program. I'm going to

00:09cover those syntaxes which I haven't covered in my previous videos. I will start with main

00:19and main is a function. Now why we write the codes, why we write the steps of the program

00:28inside this main function. Why don't we start writing this code, the declaration part and

00:38then initialization part of the variable and other things directly after the header file.

00:49Why first of all we use the main function and inside the main function why we write

00:54down the things. To understand this we have to understand what is function. The meaning

01:03of function is to execute block of statement or you can say block of statements which perform

01:15any task and provide result that is known as what function. To better understand I give

01:24a realistic approach example. Any task which is to be performed that has to be gone through

01:32steps and when it's gone through steps then that task is performed that function completes

01:43and in a real life we need an entity to perform that steps. For example suppose one of the

01:54teacher has to teach any one of the topic of any subject and in the class students are

02:09there but the teacher is not present. So will the task will perform, will the function operate. No

02:22you need that entity, the teacher should be there. When the teacher goes through the steps

02:30to explain about that topic then only the students will be able to understand and if the

02:41teacher that entity is not there the task is not going to perform because the teacher is going to

02:49explain the step by step about the subject and then only the task will be performed or you can

03:01say the function is going to operate and the students are going to understand about the

03:05topic and if the teacher is absent it's not going to work. So any work which is going to perform,

03:13any work which is having the steps that is to be execute in a real world for that an

03:21entity is required. So the same architecture is here also. If these steps are to execute

03:32for that you need a function and that function is what main. So as in a real life an entity is

03:43required to go through the steps here the main function is required to go through these steps

03:50and within this main function these steps are encapsulated which is given to the processor

04:00to process step by step and the results are obtained. That's why whatever we write, we write

04:09down inside this main function. Now let us understand about the semicolon which we use

04:20at the end of the statement. I don't know that have you observe or not. If you see at the end

04:34of the main function I haven't used semicolon but at the end of the declaration of the variables I

04:43have used the semicolon and if you see at the end of this for loop statement I haven't used what

04:52semicolon. So some at the end of some of the statement I have used semicolon but at the end

05:01of some of the statements I haven't used semicolon. So what the meaning of it? When the explanation

05:12of any one of this syntax completes within a single line then you have to terminate it and

05:21you have to tell the compiler that to compile it from the next line. So we have to use what

05:28semicolon that is the end of the statement or end of the syntax. So here the declaration of

05:36the variable so meaning of it is completes within a single line that is you have to end this

05:43statement to add it to acknowledge to the compiler we have to use what semicolon. But main is not a

05:53single line statement it has to go through steps as we have just discussed that it is a function

06:00and a function that having the block of statements to perform a task so it has to go through what

06:08steps and those steps are not in a single line. For that we use what open braces that is start

06:15of the program. Start of the main function and then close braces that is here at the end that

06:24is end of the program. So we use what when a statement not ends in a single line we use what

06:42open braces for the start of the statement and the close braces for the end of the statement.

06:51So main function is not a single line statement the meaning of it only completes when you go

06:59through these steps that is of the program. In the same way if you see the for loop so the

07:06for loop is not going to complete within a single line that's why we haven't used what's

07:11semicolon at the end of it. So for that is the start of the loop if you see which is

07:20indicating that loop has started there's some work is performed and when it

07:28gone through some steps is the end of the loop okay and the same for the if statement you must

07:36have seen that at the end of this if statement we not use semicolon because it is also not a

07:43single line statement it's not going to cover in a single line. We need what open braces the true

07:50part and with the else what the false part or you can say the no part this is the yes part and is

07:56the no part. So for that when the task is performed through steps more than one steps then we use

08:11what braces the open braces for the start and close braces for the close. So I explained both

08:19the things why we use the semicolon and why we use open braces and the close braces. When the

08:28explanation is in more than one lines in more than one steps for that we use open braces and

08:38close braces that's why for the start of the function we use open braces for the start of

08:45the loop we use open braces for the start of the if statement we use open braces and for the end

08:53of the function we use close braces for the end of the loop use close braces and for the end of

09:00the if statement also we use what close braces. For the indication of the start and the close of

09:08function loop and if statement.

09:16So I hope I have explained all the syntaxes which is used inside the program. I have explained about

09:24the header files why we use hash include. I have explained in my previous video about the

09:30header files and the hash include. I have explained about what happens when we declare the

09:37variables okay and why we use the ampersand sign why the specifiers are used okay and here I have

09:50used what data type int with the main function it means it should return so it is returning the

10:00return zero value which indicates the exit status that everything is fine we got the result it is

10:09indicated by written zero. In the next video I'm going to explain something else. Thanks for today.

Learn Programming Technique C to Master Skills - About Main function and other syntax

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