C Operators - Embedded C

guitarmano

Can any one tell me what -> means when used in embedded c? I think its a pointer but i am not altogether sure. Please tell me and put my mind at rest.....

Creamy Goodness

guitarmano wrote:

Can any one tell me what -> means when used in embedded c? I think its a pointer but i am not altogether sure. Please tell me and put my mind at rest.....

i'm pretty sure it's used for pointers to structures.

have you any code so that others can confirm?

Gosh

The . and -> operators reference individual elements in structures and unions.

The . operator is used when working with the actual structure or union, e.g.:
employee.wage = 500.00;

The -> is used when working with a pointer to the structure or union, e.g.:
emp_ptr->wage = 500.00;

Tobias Greeshman

1. Use the . operator when referencing items in a structure when you have a direct reference to the structure.
2. Use the -> operator when referencing items in a structure when you have an indirect reference to the structure (ie. a pointer to a structure).

struct person
  {
     char *str_name ;
     char *str_address ;
     int age ;
  } ;

  ....
  person curr_person ;
  curr_person.str_name = new char [100 ] ;
  memset (curr_person.str_name, "John" ) ;
  ...

  person *ptr_person = new person ;
  ptr_person->age = 25 ;
  ptr_person->str_name = new char [ 100 ] ;
  memset ( ptr_person->str_name, "Peter" ) ;
 
  ...