Basic grammar of C language

1,c Tokens (Tokens)

printf ("Hello, world! \ n");  

These five tokens are:

printf ("Hello, world! \ n");

2, semicolon is the Terminator of the statement
3, note is */* sub-language Comment */(note that annotations cannot be nested)

4, the identifier C identifier is the name used to identify the variable, function, or any other user-defined item. An identifier begins with a A-Z or a-Z or underscore, followed by 0 or more letters, underscores, and numbers (0-9).

5, keyword

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

Spaces in the 6,c

A line that contains only spaces, called a blank line, may have comments, and the C compiler ignores it completely.

in C, spaces are used to describe whitespace characters, tab characters, line breaks, and comments. Spaces separate the parts of the statement so that the compiler can recognize where an element in the statement (such as int) ends and where the next element begins. Therefore, in the following statement:

Keywords in 7,c

Start by year:

• Auto      break     case       Char   ;    const         Continue  default     do 

• Double  else       enum      extern   Flo At           for             Goto         IF&NB SP;

• int long register return short signed sizeof static 

• struct   switch    typedef  union    unsigned &nbs P;void            volatile   while

December 16, 1999, ISO introduced the C99 standard, which added 5 C language keywords:

• inline    restrict    _bool   _complex    _imaginary< /li>

December 8, 2011, ISO released the new standard for C language C11, which added 7 C language keywords:

• _alignas _alignof _atomic _static_assert _noreturn _thread_local _generic

Basic grammar of C language