Reference example
Double: declaration Double precision Variable or function Int: declaration Integer variable Or function struct : Declaration structural morphology Variable or function Break: jump out of the current loop
else ： Conditional statement Negative branch (used with if) long : Declare a long integer variable or function switch : for switch statements Case: Switch statement branch
Enum: Statement Enumeration type char : Declare character variable or function extern : Variables are being declared in other files return ： subroutine Return statement (with or without parameters) union : Declare a common data type Const: declare a read-only variable
Float: declaration float Variable or function short : Statement is short Integer variable Or function unsigned : Declare an unsigned type variable or function continue : End the current cycle and start the next cycle signed : Declaration Signed type variable Or function void : Declare function none Return value Or no parameter, declare a typeless pointer default : Switch the "other" branch in a statement goto : Unconditional jump statement sizeof : Calculate data type length volatile ： Description variable Can be changed implicitly during program execution while : Loop condition of loop statement Static: declaration Static variable If: conditional statement
Inline: Statement Inline function restrict : Used to qualify and constrain pointers _Alignas ：
_alignof ：
_Atomic: Declare atomic type
_Bool: Declare Boolean type
_Complex: Declare complex type
_Generic：
_Imaginary: Declare an imaginary number type
_Norreturn: Make the function not return
_Static_assert：
_Therad_local：
