Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

                       ◄Example►                 ◄Contents►  ◄Index►  ◄Back►
──────────────────────────────────────────────────────────────────────────────
'This example uses the VAL function to determine the numeric value of
'numbers stored as strings. The program prints the names and addresses of
'people with specific telephone area codes.
 
'This part of the program builds a sample data file.
OPEN "PHONE.DAT" FOR OUTPUT AS #1
CLS
RESTORE
READ FuName$, ACPhone$
I = 0
DO WHILE UCASE$(FuName$) <> "END"
   I = I + 1
   WRITE #1, FuName$, ACPhone$
   READ FuName$, ACPhone$
   IF FuName$ = "END" THEN EXIT DO
LOOP
CLOSE #1
 
DATA "Bob Hartzell ","206-378-3223"
DATA "Alice Provan ","213-884-9700"
DATA "Alex Landow ","213-456-3111"
DATA "Walt Riley ","503-248-0048"
DATA "Georgette Gump ","213-222-2222"
DATA "END",0,0,0,0,0
 
'This part of the program demonstrates the VAL function.
INPUT "Search for which area (206, 213, or 503): ", Targetarea
OPEN "PHONE.DAT" FOR INPUT AS #1
DO WHILE NOT EOF(1)
   INPUT #1, Nm$, Phonenum$
   'VAL reads everything up to the first non-numeric
   'character ("-" in this case).
   Area = VAL(Phonenum$)
   IF Area = Targetarea THEN
      PRINT
      PRINT Nm$;
      PRINT Phonenum$
   END IF
LOOP
CLOSE
KILL "PHONE.DAT"
END