Introduction of C Language

Introduction of C

The C programming language is a genera-purpose, high-level language (generally denoted as structured language). C programming languages was at first developed by Dennis M.Richie at At&T Bell Labs.

C is one of the most commonly used programming languages. It is simple and efficient therefore it become best among all. It is used in all extends of application, mainly in the software development.

Many software's & application as well as the compilers for other programming language are written in C also Operating Systems like Unix, Dos and Windows are written in C.

C has many powers, it is simple, stretchy and portable, and it can control System Hardware easily. It is also one of the few languages to have an international standard, ANSI C.

Advantages of C

1. Fast Powerful & efficient
2. Easy to learn.
3. It is portable.
4. "Mid-level" Language
5. Widly accepted language 6. Supports modular programming style.
7. useful for all applications
8. C is the native language of UNIX
9. Easy to connect with System devices/assemvly routines.

Structure of program

/*This program prints Hello World on screen*/
----------------------------------------------------------------

#include
Void main()
{
printf("Hello world\n");
}

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1./*This program....*/
The symbols/*and*/used for comment. This Comments are ignored by the compiler, and are used to provide useful information about program to humans who use it.
2.#include

This is a preprocessor command which tells compiler to include stdio.h file. 3.main()
C programs consist of one or more functions. There must be one and only one function called main. The brackets following the word main indicate that it is a function and not a variable.
4.{}
braces surround the body of the function, which may have one or more instructions/statements.
5.printf()
it is a library function that is used to print data on the user screen.
6."Hello world\n" is a string that will be displayed on user screen\n is the newline character.
; a semicolon ends a statement.
7.return 0; return the value zero to the Operating system.

C is case sensitive language, so the names of the functions must be typed in lower case as above.
we can use white spaces, tabs & new line characters to make our code easy to read.