What is Keywords in C?

Keywords in C are predefined reserved words that have a specific meaning in the C programming language. These words cannot be used as variable names, function names, or any other identifiers. They are used to define the syntax and structure of the C language and play a crucial role in its compilation and interpretation.

Keywords are used to define various elements of the C language, such as data types, control structures, loops, functions, and storage classes. They provide a standard set of instructions that the compiler can interpret and execute efficiently.

There are a total of 32 keywords in C, and they can be divided into the following categories:

1. Data types: These keywords are used to define the basic data types in C, such as int, char, float, double, and void.
2. Control structures: These keywords are used to control the flow of the program, such as if, else, switch, case, and default.
3. Loops: These keywords are used to implement iteration, such as for, while, and do.
4. Functions: These keywords are used to define functions, such as return, break, and continue.
5. Storage classes: These keywords are used to define the storage class of variables, such as auto, register, static, and extern.

Types of Keywords in C:

SR. NO.	Keyword	Information
1	auto	Used to declare local variables with automatic storage duration.
2	break	Used to exit from a loop or switch statement.
3	case	Used to define a case in a switch statement.
4	char	Used to define a character data type.
5	const	Used to define a constant value.
6	continue	Used to skip the current iteration of a loop.
7	default	Used to define a default case in a switch statement.
8	do	Used to define a do-while loop.
9	double	Used to define a double-precision floating-point data type.
10	else	Used to define an alternative branch in an if statement.
11	enum	Used to define an enumerated data type.
12	extern	Used to declare a variable or function that is defined in another file.
13	float	Used to define a single-precision floating-point data type.
14	for	Used to define a for loop.
15	goto	Used to jump to a labeled statement.
16	if	Used to define a conditional statement.
17	int	Used to define an integer data type.
18	long	Used to define a long integer data type.
19	register	Used to declare local variables with register storage duration.
20	return	Used to return a value from a function.
21	short	Used to define a short integer data type.
22	signed	Used to define a signed data type.
23	sizeof	Used to determine the size of a data type or variable.
24	static	Used to declare a variable or function with static storage duration.
25	struct	Used to define a structure data type.
26	switch	Used to define a switch statement.
27	typedef	Used to define a new data type.
28	union	Used to define a union data type.
29	unsigned	Used to define an unsigned data type.
30	void	Used to define a void data type.
31	volatile	Used to declare a variable that can be modified by hardware or other software.
32	while	Used to define a while loop.

Rules while declaring Keywords in C:

1. Keywords cannot be used as variable names, function names, or any other identifiers.
2. Keywords are case sensitive and must be spelled correctly.
3. Keywords cannot be abbreviated or modified in any way.

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