Lecture 11: User defined types and structs

User-defined types

video

Optional reading: Chapter 7.7

Key ideas:

• Can define our own types using typedef keyword.
• _t naming convention
• Enumerated types using enum
• Can use the types as integers for readability of code

Structs

Intro to structs video More on structs video

Optional reading: 10.

Key ideas:

• In procedural programming language like C, we can put data together (but can’t tie logic to it).
• Syntax:

  typedef struct {
    <type> <id>;
    <type> <id>;
    ...
  } <name of structure datatype>;
  

• Accessing components using the direct component selection operator .
• Assigning component values using = vs. strcpy for strings
• Precedence of .
• Passing structs as pointers and using ->
• putting a struct in its own header file

Lab 4 intro

video