First Program in C programming language

Hello viewer! In this post, we'll start learning our first program in C language.

Before we start our first program we need to understand the some basic concept. So Let's Start...

Header File

• Header files contains the definition of functions and variables, which is used in C program by using the Preprocessor
• Header files with the extension ".h" ( Dot h )
• Some types of header files like..  "stdio.h", "conio.h", "math.h", "dos.h" etc.
• Types:-  

1. System Header Files - This type of header file is already saved/come with the compiler we do not need to change this header file.
2. User Header File - These type of Header file is defined by the programmer like you. ( You are also a programmer :) )

Preprocessor Directives

• These are used to include the header file.

Such as:-   #include , #include

Note- "#" ( hash ) is the Preprocessor.

main()

• Every program in C we need to have a "main()" function. ( discuss in the future post ) 
• It means to start the execution of the program.

printf()

• These are used to print any message on the Screen.

Suppose we need to print " Welcome to Programming Language" on the screen then our syntax is like this...

printf("Welcome to Programming Language"); 

Note: 

•  do not forget the semicolon ( ; ) at the end of the printf.
• "printf" is predefined function, not a keyword.

Scanf()
This is used for store the user value that they enter.
suppose, we have to create the Two Numbers Addition Program and the user enter two number like a=4, b=5 then the syntax looks like this..


printf("Enter Two Numbers");
scanf("%d%d", &a,&b); // These are the syntax of  scanf. here the value 4 store in variable a & value 5 store in variable b.

getch()

• getch() is a predefined function which is used for hold the output screen. if in a program we don't see the output of the program it was to fast . to hold the output screen we need to declare the getch() function.

Now Friend let's start with our first program to print "Hello Baby" on the screen...

Program : 

    

   #include

   #include

    int main()

    {

     printf("\nHello Baby");

     getch();

    }

Now let's Understand all the part of code/program...

#include 

•  The function is used for generating output is define in stdio.h.
• In order to use the printf function we need to include the library file in which their explanation called Header File.
• It means standard Input/Output.

#include

• It means Console Input/Output.
• This is also a type of header file in which declaration of getch function.

int main()

• Every C programs in C contain a main() function as the entry point to control of program.
• Curly brackets "{}" indicates the begining and the end of a function ( also called a Code Block )

printf("\nHello Baby");

• In this printf is the function used for print any message on screen here we pass "Hello Baby" to it.
• \n ( escape sequence ) used to print message in new line.
• Escape Sequence always begin with backlash ( \ ) .
• The semicolon ( ; ) indicates the end of the statement.

and last getch() is already discussed in the above line.

In this post are so enough 4 today. I hope you like it.

Thank You 4 reading my blog!  if you have any problem or issue with this post please comment/contact.