Logical Operation - Sharp MZ-700 Basic Manual

65
• Logical operation
Logical
operation
The task of giving YES or ON results, by judgment, are not few in computers. Here
let us consider some logical expressions used to judge some conditions. The logical
operators NOT, AND, OR and XOR are used in logical expressions.
CD
X AND Y (logical product
=
and)
AND means X moreover Y
XY X and Y
1 1 1
1 0 0
0 1 0
0 0 0
®
NOT X (negation
=
not)
Means that it is not X
NOT X
o
®
X OR Y (logical addition
=
inclusive or)
OR means either X or Y
XY XORY
1 1 1
1 0
1
0 1
1
0 0 0
@ X XOR Y (Exclusive logical addition
=
exclusive or)
Means X and Y are not equal
XY XXORY
1 1
0
1 0 1
0 1
1
0 0 0
The logical operation is usually used in IF - THEN - ELSE command, explained
before. For instance, it is used as follows:
• IF -30<X AND Y>20 THEN 120 ELSE 100
(The meaning above is: if the X value is -30<X moreover Y>29 go to line number
120, if not jump to line 100)
• IF -30<X OR Y>20 THEN 10 ELSE 100
(The meaning above is: if the X value is -30<X or Y>20 to to line number 120, if
not jump to line 100).