ABL electronic PIC Microcontrollers PIC18 User Manual

Variables of same structured type may be assigned one to another by means of
simple assignment operator (

=

). This will copy the entire contents of the variable

to destination, regardless of the inner complexitiy of a given structure.

Note that two variables are of same structured type only if they were both defined
by the same instruction or were defined using the same type identifier. For exam-
ple:

/* a and b are of the same type: */

{int m1, m2;} a, b;

/* But c and d are _not_ of the same type although

their structure descriptions are identical: */

{int m1, m2;} c;

{int m1, m2;} d;

You can get size of the structure in memory by means of operator 

sizeof

. Size of

the structure does not necessarily need to be equal to the sum of its members’
sizes. It is often greater due to certain limitations of memory storage.

A function can return a structure type or a pointer to a structure type:

mystruct func1();

// func1() returns a structure

mystruct *func2();

// func2() returns pointer to structure

A structure can be passed as an argument to a function in the following ways:

func1(mystruct s);

// directly

func2(mystruct *sptr);

// via pointer

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