Data Types in C Keywords | Tokens in C

Data Types in C:

                

What is a Data Type?

        The Data Type is the type of data that a variable can store in its Memory. Each Variable in C has an associated data type. Based on the data type, the compiler will Allocates the memory to the variable.

Types Of Data Types :

Basic Data Type	int, char, float, double
Derived Data Type	array, pointer, structure, union
Enumeration Data Type	enum
void Data Type	void

Data Types And Its Memory Allocation:

Now lets see some memory sizes of Basic Data Types. The memory size of the basic data types may change according to  64-bit operating system. The Memory sizes of other Data Types will be Discussed later.

1 Byte = 8 bits

Range = 2 power (no of bits - 1)

Data Type	Memory Size	Range
char	1 byte	-128  to  127
shot	2 bytes	-32768  to  32767
int	4 bytes	-2147483648 to -2147483647
Long int	8 bytes	-2^64 to (2^64)-1
float	4 bytes	-32768  to  32767
double	8 bytes	-2^64 to (2^64)-1

Keywords in C:

    There are 32 keywords in C. A keyword is a reserved word. We cannot use these keywords as the variable name and constant name.

    The keywords are listed below:

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	unsigned	void
volatile	while

  

Tokens in C:

    We can define the token as the smallest individual element in C. Tokens are categorized into different parts. Tokens in C is the building block for creating a program in C. 

• Keywords in C             [listed above]

• Identifiers in C             [its a variable , will discuss in next topic]
• Strings in C                  ["hello ", "world"]
• Operators in C             [+, -, *, /, %, .......etc]
• Constant in C               [const]
• Special Characters in C     [@, $, &, .....]

Each and every token will be discussed in later topics.

                                                                                    

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