From e40090ed64d4bc44f0828eea56c3c155a5fe4594 Mon Sep 17 00:00:00 2001
From: Jet Hughes <hugje043@student.otago.ac.nz>
Date: Mon, 8 Aug 2022 11:21:12 +1200
Subject: [PATCH] vault backup: 2022-08-08 11:21:12

---
 content/notes/09-intro-to-c-2.md | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/content/notes/09-intro-to-c-2.md b/content/notes/09-intro-to-c-2.md
index d5a7f429e..04e9d847f 100644
--- a/content/notes/09-intro-to-c-2.md
+++ b/content/notes/09-intro-to-c-2.md
@@ -5,7 +5,7 @@ tags:
 - 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
\ No newline at end of file