Static Duration, External Linkage

• External Variables.

• Defined external (outside) of any function.

• Also called “global” variables. (ugh!)

• Practice: external.cpp (be sure to note:)

  • Global variable definition
  • extern keyword (helps readability)
  • :: scope operator
  • defining declaration: double warming(0.3);
  • referencing declaration: extern double warming;
  • local definition hides global variable