Sharp PC-1500A Instruction Manual page 49

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Normally. of course, this program would execute in asce·nding line-number sequence. The
effect of the GOTO in line 20, however. is to cause SHARP to proceed immediately to line 50
and to begin in ascending sequf.?nce from there. Lines 30 and 40 are never executed.
The general form of the GOTO statement is:
GOTO expression
where:
expression evaluates to a number which is a
valid program line·number (i.e. 1 through 65279).
NOTE: Specifying a line.number which does not exist will result in an ERROR 11.
If we \Vish to have several instructions executed as a result of a certain choice
\VC
use GOTO
statements in conjunction \Vith the IF :
10
!E.
test THEN GOTO
100
20 {
statements here are
{ performed only if the
j
test is False.
90 GOTO 200
100
l
statements here are
j
performed only if the
{ test is True.
200 {
statements here
are
{ always performed.
999
ENO
The logic of this program is applicable to many situations. Any number of statements can be
inserted in each of the sections which arc formed by the GOTO statements.
As an example of this structure in practice. the following segment rrom a checkbook program
determines whether a given input amount is a deposit (positive number) or a \Yithdrav.ial{negative
number). An initial balance is entered by the user:
Program listi ng:
10 INPUT "INITIAL BALANCE?", B
20 INPUT "TRANSACTION AMOUNT?", TA
25
IF TA =
0 THEN GOTO 80
30 B=B + TA
40 IF TA<O THEN GOTO 70
50 PRINT "DEPOSIT OF $";TA; " POSTED"
60 GOTO 80
70 PRI NT TA; " DOLLARS WITHDRAWN"
80 PRINT
" F INAL BALANCE =
"; B
90
ENO
47
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