Mikroelektronika MIKROE-724 データシート

210

mikoBasic PRO for dsPIC30/33 and PIC24

MikroElektronika

program example

dim w  as word

    ptr_b   as ^byte

    ptr_arr as ^byte[10]

    arr     as  byte[10]

main:

  ptr_b   = @arr ‘ @ operator will return ^byte

  w       = @arr ‘ @ operator will return ^byte

  ptr_arr = @arr ‘ @ operator will return ^byte[10]

end.

If 

F

 is a routine (a function or procedure), 

@F

 returns a pointer to 

F

. 

Related topics: Pointer Arithmetic

Pointer arithmetic in the mikroBasic PRO for dsPIC30/33 and PIC24 is limited to:

 

- assigning one pointer to another, 

 

- comparing two pointers, 

 

- comparing pointer to zero, 

 

- adding/subtracting pointer and an integer value, 

 

- subtracting two pointers. 

Assignment and Comparison

The simple assignment operator (=) can be used to assign value of one pointer to another if they are of the same type. 

Assigning the integer constant 0 to a pointer assigns a null pointer value to it.

Two pointers pointing to the same array may be compared by using relational operators 

=, <>, <, <=, >, 

and

 >=

. 

Results of these operations are the same as if they were used on subscript values of array elements in question:

dim ptr1 as ^byte

    ptr2 as ^byte

    a as byte[10]  ‘ array a containing 10 elements of type byte

main:           

  ptr1 = @a[4]

  ptr2 = @a[2]

  if (ptr1 = ptr2) then ...   ‘ won’t be executed as 4 is not equal to 2 

  if (ptr1 > ptr2) then ...   ‘ will be executed as 4 is greater than 2 

  if (ptr1^ = ptr2^) then ... ‘ if the value pointed to by ptr1 is equal to the value 

  if (ptr1^ > ptr2^) then ... ‘ if the value pointed to by ptr1 is greater to the value 

end.