Commodore PET User Manual page 93

IF . .. THEN is the primary decision making tool in PET BASIC programs. It
has two parts: a condition to be tested placed just after the IF; and if the condi-
tion is satisfied, one or more actions to be taken placed after the THEN. We have
already used this statement frequently. Here are a few more examples:
10 IF A=B+5 THEN PRINT MSGI
40 1F CC${" t'l"
THE~j
1N=0
41 IF Q<14 AND M<>Ml GOTO 66
ON . .. GOTO and ON " . GOSUB provide a multiple branch capability. The
following example provides a three-way branch to line 10, 72, or 50 depending on
whether A=l, 2, or 3, respectively. If A is not in this range, no branch is ta ken.
40 ON A GOTO 10,72,50
Defining Data: LET . ..
=,
READ/DATA/RESTORE, DIM
Statements for defining data allow vou to specify constant data, assign
values to variables, and dimension arrays.
The assignment statement LET . .. =, or just =, is probably the most com-
mon BASIC statement. The word LET is optional and is usually omitted.
10 A=10
2€1 B=}-:;+IT'-2"t3
25
B;~;(24
.. 2)=AL
.....In this statement. only the second
=
is an
21 FOR 1=1 Ta
10'A(I)-~+1~
. , .' -,', assignment statement.
The READ statement assigns to variables the values contained in accom-
panying DATA statements.
10 DATA 10,20,-4,16E6
2(1 F:EAD A,
E: .. C.·
D
RESTORE restarts the next READ at the beginning of the first DATA state-
ment.
:::0 RESTORE
40 FOR 1=1 TO 4:READ A<I)
The dimension statement DIM declares the size and dimension of arrays.
hX1 II1t1 A(3)
Console Input/Output: PRINT, INPUT, GET
Console input/output statements provide the ability to interact with the
keyboard/display screen during program execution.
PRINT prints data on the display screen. PRINT and? are equivalent.
1(1 PR
UJT
"NAt'lE "
3(1
?A,B .. C
80