Self-taught C language first lesson--Initial understanding of keywords

I think, learning a language, whether it is a programming language, or natural language, first of all, from the macro to master the use of the key to make up the language.

ANSI c A total of 32 keywords:

Auto	Break	Case	Char	Const	Continue	Default	Do
Double	Else	Enum	extern	Float	For	Goto	If
Int	Long	Register	Return	Short	Signed	Static	sizeof
struct	Switch	typedef	Union	Unsigned	void	Volatile	While

Before formally studying this language, I Baidu the function of these keywords:auto-> declare automatic variables, break-> jump out of the current loop, case-> switch Statement branch, char-> declare character type variable or function return value type, const-> Declares a read-only variable, continue-> ends the current loop, starts the next round of loops, the "other" branch in the default-> switch statement, the loop body of the do-> Loop statement, Double-> declares a double-precision floating-point variable or function return value, else- The > Conditional statement negates the branch (as with if), Enum-> declares an enumeration type, extern-> declares a variable or function is defined in another file or elsewhere in this file, Float-> declares a floating-point variable or function return value type, for-> A looping statement, goto-> unconditional jump statement, if-> conditional statement, int-> Declaration integer variable or function, long-> declaration long Integer variable or function return value type, register-> declaration register variable, return- > subroutine return statement (with or without parameters), short-> declaration of a short integer variable or function, signed: Declares a signed type variable or function, sizeof-> computes the data type or variable length (that is, all bytes), static-> Declaring a static variable, struct-> declaring struct type, switch-> for a switch statement, typedef-> to alias a data type, unsigned-> declaring an unsigned type variable or function, union-> declaring a shared body type , the void-> declares that the function has no return value or no parameter, declares the untyped pointer, volatile-> the variable can be implicitly changed in the execution of the program, and while-> the cyclic condition of the loop statement.

Completely according to the Baidu Encyclopedia C language keyword function played 32 keywords, a lot of things can not understand, such as what is "function return value type", what is "switch statement", What is "byte", static variable, dynamic variable and read-only variable is what relationship ... Many do not understand, but I will learn slowly through Baidu.

The function of these 32 keywords seems to involve a lot of "declaration", I would like to declare that may be indispensable to the program or most of the situation is indispensable, but I guess, the future of learning will tell me the answer, hehe.

It was late, and the dorm implausible began again. The roommates are talking about the women and the men who love the Twin Cities, I still sleep.

Self-taught C language first lesson--Initial understanding of keywords