learn about C Tokens

Welcome back! In my last post, I explain about struture of C program after that we need to know about C tokens.

So in this post I will explain about what is Tokens, How many types of C tokens and all that things. So let’s start…

In Genral text, a word and punctuation marks are called tokens. In C program the smallest individual units are known as Token. The following six types of tokens are used in C language:
1) Keywords: Following keywords available in C:

auto	break	case	char
const	continue	default	do
double	else	enum	extern
float	for	goto	if
int	long	register	return
short	signed	sizeof	static
struct	switch	typedef	union
unsinged	void	volatile	while

    2) Identifiers: An identifier is a sequence of characters that represents an entity such as a function or a data object.

    3) Constants: Constant is a value that can be stored in the memory and cannot be changed during execution of the program.

    4) Strings (Alphabets): A string is a sequence of characters. Strings are stored in memory as ASCII codes of characters that make-up the string appended with’\0’(ASCII value of null). Normally each character is stored in one byte, successive characters are stored in successive bytes.

    5) Variables ( special symble): Variable is a named location in memory, i.e., used to hold a value that can be modified by the program. These variables can take different values but one at a time. The values of variables can be changed during execution. All the variables should be declared before they can be used.
    6)Operators: An operator is a symbol that tells the processor to perform certain mathematical or logical manipulations. Operators are used in programs to manipulate data and variables. The data itself is called ’operand’.