# Logical operators

``` BBS: Inland Empire Archive
Date: 04-03-92 (18:12)             Number: 67
From: JIM WELLS @ 930/21           Refer#: NONE
To: BILL WHITE                    Recvd: NO
Subj: Logical operators              Conf: (2) Quik_Bas```
```BW>     I knew there were 6 logical operators, but it took
BW>me a while to figure out that you left out NOT!  Its use
BW>is obvious.

BW>     Could you shed some light on IMP?  I see how to use
BW>the others, but how is IMP used?  I've never seen it used
BW>(so maybe it isn't!)

BW>              The Bill White in Miami, FL

IMP, Bill, is both a logical and arithmatic operator. Its
logical function returns a value of false (0) only if its
first operand is true and its second operand is false.

Here's a truth table for it:

x        y        xIMPy
-------------------------
1        1          1
1        0          0
0        1          1
0        0          1

IMP stands for implication as in a statement is TRUE if
the value of the first operand implies the value of the
second.

IMP accepts single and double precision operands but it
converst them to integer or long integers before processing
and the normal QB limits for those variable types apply.

Its arithmatic use is pretty rare but can be seen in the
following statement:

answer will equal 1 (true) according to the truth table above.

IMP is a really useful operator for two variable
comparisons and I think it's more machine efficent than an
if then else clause.

Rgds...Jim

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