User defined types.md

User defined types

• enum: used to enumerate things, e.g. weekdays, for example:

  enum week
  {
  	monday, tuesday, wednesday, thursday, friday, saturday, sunday
  };
  enum week day;
  

• struct: Save a collection of variables (a structure), e.g. for complex numbers:

  struct complex:
  {
  	double real;
  	double imaginary;
  };
  c1 = {1.0, 2.0};
  
  //can be accessed through .
  int real_part = c1.x;
  
  //for pointers, can be accessed through ->
  struct complex *ptr_to_c1 = & c1;
  int real_part = ptr_to_c1->x
  

  • ptr_to_c1->x is equivalent to (*ptr_to_c1).x