Atari 800

142 User's Handbook to the Atari 400 /8 00 Computers
If no STEP statement is used, the counter value increases by 1
each
time a NEXT state ment is executed.
A FOR/NEXT lo op can al so have a decreasing counter . If the STEP
argument is negative, the value of the counter decreases each
time the loop is executed .
An increasing counter will repeat the l oop until one more
incr ease would make the counter greater than the final value. A
decreasing counter will repeat the l oop until one more decrease
would make the counter l ess than the final va lue .
When a loop has been comp l eted, the statement after the NEXT
statement is executed .
NOT
NOT is a logi cal operator that returns the value 1 if its argument is
false. If its argument is true, the NOT statement returns the value
o.
CONFIGURATION
X = NOT EX
The following truth table describes the NOT operator .
A
NOT A
0
1
1 0
The computer represe nt s the condit i on of true with the number
1. The false condition is re presented by o.
Numbers a nd expressions are considered true if they equa l any
numb er other than o. Only numbers that equal 0 are false. The
following examples are true .