save memory by using the same memory region for storing different objects at different times

const

keyword is a way to declare that a variable's value will not change

const keyword can also be used for function parameters to indicate

that a
function promises not to change a value
• Allows for clearer documentation of the implementation of a function
• Allows programmers to assume a function won't change a variable's value

int * const p = &h2g2; means

p always points to &h2g2

const int *p = &h2g2; means

p points to a const int

const int * const p = &h2g2;

p always points to a const int

clockwise or spiral rule to convert a declaration to a sentence

1.Take the name of the variable: "var is"
2. Replace [X] with "array X of" (or
replace [] "array undefined size of"
3. Replace function parameters (type1,
type2) with "function passing type1
and type2 returning..."
4. Replace * with "pointer(s) to"
5. Replace const with "constant"

use the clockwards spiral rule to turn this into a sentence: char * str[10]

str is an array 10 of pointers to a char

const int * const d;

d is a constant pointer to an int constant