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Procedures

• A function without a return value is called a procedure.

  print_time(now);
  

• The missing return value is indicated by the keyword void.

  void print_time(Time t)
  {
     cout << t.get_hours() << ":";
     if (t.get_minutes() < 10) cout << "0";
     cout << t.get_minutes() << ":";
     if (t.get_seconds() < 10) cout << "0";
     cout << t.get_seconds();
  }
  

• Since a procedure does not have a return value, it must have a side effect.
• Ideally, a procedure has only one side effect.

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