diff --git a/content/notes/11-struct-and-union.md b/content/notes/11-struct-and-union.md
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@@ -0,0 +1,69 @@
+---
+title: "11-struct-and-union"
+aliases: 
+tags: 
+- cosc204
+---
+
+# Struct
+not a calss
+- class like *composite data type* called struct
+- POD plain old data
+
+## declare
+```
+struct <name>{
+	<type><name>;
+	<type><name>;
+} <variable>;
+
+struct point_2d {
+	double x;
+	double y;
+} point;
+```
+
+typically an anonymous struct is declared and then given a name with typedef
+
+```
+typedef struct {
+	double x;
+	double y;
+} point_2d;
+```
+
+This is the common convention now.
+
+## initalize
+```
+point_2d location = {0.0, 1.0}; //initalizers
+point_2d location = {.y = 1.0, .x = 0.0}; //designated initalizers
+```
+
+## accessing
+use the `.`
+
+```
+point_2d location;
+
+location.x = 0;
+location.y = 1;
+```
+
+## shallow copy
+copy the members including pointers
+- but not the things the pointers point to
+
+![shallow copy example 1](https://i.imgur.com/w3B3ce0.png)
+![shallow copy example 2](https://i.imgur.com/mL5QION.png)
+
+ both point to the same memory location.
+when you change one - they both change.
+
+## passing to routines
+passed by value
+
+```
+void print(thing object)
+```
+
diff --git a/content/notes/cosc-204.md b/content/notes/cosc-204.md
index 90b855663..396af32f7 100644
--- a/content/notes/cosc-204.md
+++ b/content/notes/cosc-204.md
@@ -38,7 +38,7 @@ tags:
 - [06-6809-programming](notes/06-6809-programming.md)
 - [07-6809-advanced](notes/07-6809-advanced.md)
 - [08-intro-to-c](notes/08-intro-to-c.md)
-
+- 
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