Mikroelektronika MIKROE-350 Fiche De Données

The binary operators 

<<

and 

>>

move the bits of the left operand by a number of

positions specified by the right operand, to the left or right, respectively. Right
operand has to be positive and less than 255.

With shift left (

<<

), left most bits are discarded, and “new” bits on the right are

assigned zeroes. Thus, shifting unsigned operand to the left by n positions is equiv-
alent to multiplying it by 2n if all discarded bits are zero. This is also true for signed
operands if all discarded bits are equal to the sign bit.

With shift right (

>>

), right most bits are discarded, and the “freed” bits on the left are

assigned zeroes (in case of unsigned operand) or the value of the sign bit (in case
of signed operand). Shifting operand to the right by 

n

positions is equivalent to divid-

ing it by 2

n

.

Although mikroBasic PRO for AVR does not support 

boolean

type, you have

Boolean operators at your disposal for building complex conditional expressions.
These operators conform to standard Boolean logic and return either 

TRUE

(all ones)

or 

FALSE

(zero):

Boolean operators associate from left to right. Negation operator 

not

associates

from right to left.

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 5

and

logical AND

or

logical OR

xor

logical exclusive OR (XOR)

not

logical negation