MikroElektronika PIC Microcontrollers PIC16 Manuel d'utilisateur télécharger pdf (Page 90)

mikroBASIC

- Basic Compiler for Microchip PIC microcontrollers

If one operand is byte and another is word, byte is converted in word.

If one operand is short and another is integer, short is converted to integer.

If one operand is short and another is longint, short is converted to longint.

If one operand is integer and another is longint, integer is converted to longint.

4. After the first expression is decomposed to simpler ones, each of these is evalu-

ated abiding the rules presented here.

Expression a + b + c is decomposed like this:

First evaluate a + b and get (value of a + b)

This gives us another simple expression

(value of a + b) + c

Let's assume a and b are bytes and c is word,

with values:

a = 23

b = 34

c = 1000

Compiler first calculates value of a + b and assumes

that the result is byte: a + b gives 57.

As c is of word type, result of adding a + b is

casted to word and then added to c: 57 + c is 1057.

Signed and unsigned numbers cannot be combined using arithmetical and logical

operators. Rules presented above are not valid when assigning expression result to

variable.

r = expression

Refer to Assignment and Implicit Conversion for more details.

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MikroElektronika PIC Microcontrollers PIC16 Manuel d'utilisateur Page 90