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content/notes/09-intro-to-c-2.md
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- cosc204
---
# Variables
# Variables and Pointers
```
va memory[3]
@ -16,5 +16,22 @@ va memory[3]
`*` is known as **dereferncing**
`**` is known as **double-dereferncing**
## Names and places
names are allocated to emmory locations of declaration
`&b;` wherever in memory b is stored
## Why Pointers
- abstractions
- dont need to know which "object" to manipulate
- ability to change a parameter
- multiple return values from a routine
- efficiency
- dont need to copy anything to pass a pointer
## Call by value
- The value of the variable is passed to the called routine.
- changes to the parameter do not propogate to the caller
## Call by address
- address of parameter is passed to the rountine