Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 90)

RPBASIC-52 PROGRAMMING GUIDE

2-71

ON GOTO

Syntax: ON expr GOTO line0[,line1[line2...]]

Function: Branches to a program line based on expr value.

valuate to greater than or equal to zero; if expr evaluates to zero, execution branches to {0th line#}; if expr

evaluates to one, execution branches to {1st line#}, etc. Commas shown are required.

Mode: Run

Use: ON A/5 GOTO 100, 200, 500

Cards: All

DESCRIPTION

The ON-GOTO instruction conditionally branches to linen where 'n' is the value of expr. The expr must

evaluate to greater than or equal to zero. When expr evaluates to zero, execution branches to line0. When

expr evaluates to one, execution branches to line1, etc. If necessary, expr is truncated to an integer.

One or more of the program lines may be the same, to GOTO the same location with different expr values.

At least one program line must be provided. Program lines may occur in any order, for example, ON A

GOTO 500,700,600.

GOTO, GOSUB, ON-GOSUB

ERRORS

BAD ARGUMENT The value of expr is less than 0.

BAD SYNTAX The expr value is greater than the number of {"nth" line#} numbers provided, or

commas were omitted between {line#} values, or no line numbers were provided after

the ON-GOTO.

EXAMPLE

10 P=2

20 ON P GOTO 1000,2000,3000

30 END

1000 PRINT "Line 1000"

1010 END

2000 PRINT "Line 2000"

2010 END

3000 PRINT "Line 3000"

3010 END

>run

Line 3000

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 162 163

Žádné komentáře

Remote-processing BASIC 52 Uživatelský manuál Strana 90