A few more Data Types

• A Union is a structure where multiple types of data can be stored in the same location.
  • These are important for activities like system level programming where space is tight.
  • They are highly error prone.
  • So we will not consider them any further.
• A Pointer is a data type used to hold the address of a block of memory.
  • These will be very important when we get to dynamic memory.
  • But not until then.
  • Except when we discuss arrays, we will talk about pass by pointer for variables.
• A Reference is a data type that Stroustrup added
  • This allows pass by reference
  • More on this in 330.