This series is going to contain fundamentals of programming. it applies to all the major programming languages.
Variables
Variables are name of memory location. If we want to store any
kind of data in memory it has to be
named. Before using a variable it
has to declared that what kind of data we are going store in that variable(int,
float or char). In c language any variable declarations must be the first
statement in main function. Advanced
languages(c++, java,c#) allow variables to be declared at any line .
Compiler:
In a program what we write are called as high level
languages. It can not be understandable
by a computer. It has to be translated in to machine language(0 or 1). That job
is done by compiler. So compilers are the software which translate high level
language into machine level language.
Interpreters
Interpreters do the same work as compiler. The primary
difference between compiler and interpreter is interpreters compile the program
line by line where as compiler compiles the whole program at once.
Comments:
Comments are used for documentation purposes. It will be ignored
by the compiler.
Single line comments
starts with //.
Multi line comment start with /* and ends with */.
Examples:
//this is a single line comment.
/*this is a
Multiline comments*/
IDENTIFIER
An identifier is the name given to the programming elements
such as variable,method,class and objects.
There are some naming rules:
It can contain alphabets, digits and underscore(_)
Special characters other than underscore are not allowed.
Spaces not allowed in a identifier.
It should not be a keyword.
Key words:
Every language contain keywords which has a special meaning
to the compiler. We can not use it for another purposes.for example we can not
use it for naming an identifier
Example for keywords:
Int, do, while,for,if
To be continued(MUTHUKARTHIKEYAN,MADURAI)
