Syntax
number OR number
Description
Or, at its most primitive level, is a boolean
operation, a logic function that takes in two bits and outputs a resulting bit.
If given two bits, this function returns true if either bit is true, and false
if both bits are false. The truth table below demonstrates all combinations of a
boolean or operation:
Bit1 Bit2
Result
0 0 0
1
0 1
0
1 1
1
1 1
This holds true for conditional expressions in
ARMbasic. When using "Or" encased in an If block, While loop, or Do loop, the
output will behave quite literally:
IF condition1 OR
condition2 THEN expression1
Is translated
as:
IF condition1 IS
true, OR condition2 IS true, THEN perform expression1
When given two
expressions, numbers, or variables that return a number that is more than a
single bit, Or is performed "bitwise". A bitwise operation compares each bit of
one number, with each bit of another number, performing a logic operation for
every bit.
The boolean math expression below describes this:
00001111 OR
00011110
--------
equals
00011111
Notice how in the
resulting number of the operation, reflects an OR operation performed on each
bit of the top operand, with each corresponding bit of the bottom operand. The
same logic is also used when working with conditions.
Example
numeric_value1 = 15 '00001111
numeric_value2 = 30 '00011110
'Result = 31
= 00011111
PRINT numeric_value1 OR
numeric_value2
END
' Using the OR operator on two conditional
expressions
numeric_value = 10
IF numeric_value = 5 OR numeric_value = 10 THEN PRINT "Numeric_Value equals 5 or 10"
END
' This will output "Numeric_Value
equals 5 or 10" because
' while the first condition of
the first IF statement is false, the second is true
Differences from PBASIC
- PBASIC OR is always logical, and | is bitwise
See also
