Videos: Structs

These videos are about C structs and unions.

• Struct 1: Declaring structs   3:11
  A C struct combines multiple field values into a single value.

• Struct 2: Accessing struct fields   1:52
  Using . and -> to access fields of a struct.

• Struct 3: Layout   4:16

  How a struct instance is represented in memory, based on the representations and alignment requirements of each field.

  Note: there is no “Struct 4” video. I counted wrong.

• Struct 5: More on alignment   2:34
  More details on struct field alignment and sizes, including the interaction with arrays.

• Struct 6: Linked-list example   4:37
  Implementing a linked list in C with struct and pointers, and connecting related C code with this machine representation.

• Struct 7: Another machine-code example   2:01
  Another example of machine code that works with structs.

• Struct 8: Unions   4:32
  A struct instance has a value of each of its fields, but a union instance has a value for only one of its fields at a time.

• Struct 9: #pragma pack   2:40

  Using #pragma pack to control struct field alignment, and why you might or might not want to control alignment.

  Here’s align.c if you’d like to try it on your machine.