Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 110)

Operating Functions

Chapter 5

5–73

You can also use the ASC() operator to change individual characters in a

defined string.

Example:

u5 STRING 1000,40

u10 $(1)=“ABCDEFGHIJKL”

u20 PRINT $(1)

u30 ASC($(1),1)=75 REM: DECIMAL EQUIVALENT OF K

u40 PRINT $(1)

u50 ASC($(1),2)=ASC($(1),3)

u60 PRINT $(1)

uRUN

ABCDEFGHIJKL

KBCDEFGHIJKL

KCCDEFGHIJKL

In general, the ASC() operator lets you manipulate individual characters in

a string. A simple program can determine if two strings are identical.

Example:

u5 STRING 1000,40

u10 $(1)=“SECRET” : REM SECRET IS THE PASSWORD

u20 INPUT “WHAT’S THE PASSWORD – ”,$(2)

u30 FOR I=1 TO 6

u40 IF ASC($(1),I)=ASC($(2),I) THEN NEXT I ELSE 70

u50 PRINT “YOU GUESSED IT!”

u60 END

u70 PRINT “WRONG, TRY AGAIN” : GOTO 20

uRUN

WHAT’S THE PASSWORD – SECURE

WRONG, TRY AGAIN WHAT’S THE

PASSWORD – SECRET

YOU GUESSED IT

5.10.1

The ASC Operator

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Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario Pagina 110