"C Language Learning" 02__auto,static,register Analysis __c language

Variables in the C language can have their own properties
You can add the "Properties" keyword when you define a variable

The "Properties" keyword indicates the unique meaning of a variable

1:auto

Auto is the default property of local variables in C language
The compiler defaults to all local variables are auto

2:static

The static keyword indicates the variable's "statically" property
Static key has the meaning of "scoped qualifier" at the same time

Static decorated local variables stored in the program static area
Another meaning of static is the file scope identifier

3:register

The Register keyword indicates that the variable is stored in a register
Register is only a request register variable, but it does not necessarily require success

The register variable must be a value that the CPU register can accept
Cannot get address of register variable with & operator

Summary
The auto variable is stored in the program's stack, and the default property
Static variable stored in program static area
Register variable request stored in CPU register