Use which lexical?

[Davor_7]

now, i can assign a symbol as below:
$ sh sym syma
SYMA = " keyword: 57"

i want the number "57"(this length will be changed, sometimes 57(2-bits), or 102(3-bit))
but i can not think out a way to get it through f$element or f$extract...
do you have any idea ?

[Ian Miller. · Accepted solution]

This gets the value of the number
x=F$NUMBER(f$element(1,":",syma))

[John Abbott_2]

I think Ian means F$INTEGER & not F$NUMBER.

[Kris Clippeleyr]

Hi,

Assuming the symbol definition only varies after the colon (:),
you have two (2) possibilities:
1. x = f$integer(f$element(1,":",syma))
2. x = f$integer(f$extract(10,f$length(syma),syma))

Regards,
Kris (aka Qkcl)

[Jan van den Ende]

Davor,

well, use Ian's answer, but F$NUMBER should be replaced by F$INTEGER.

-- and most of the time, you do not need the explicit F$INTEGER at all.
If you need the number without leading zeroes, just use the symbol name. If used in numeric calculations, the value is automagically converted.

Proost.

Have one on me.

jpe

[Ian Miller.]

yes

x=F$integer(f$element(1,":",syma))

It should be - this is what you get from not copying directly from the terminal window :-)

[Hein van den Heuvel]

F$ELEM is the way to go normally.

There is one more technique that is often overlooked (unknown) which can give you the answer quickly: String subtraction!

If you know the exact string for " keyword", let's say "TEST", then the solution can be:

$ syma = " TEST:57"
$ number = syma - " TEST:"
$ show symb number
NUMBER = "57"
$ write sys$output f$type(number)
INTEGER
$ other_number = syma - "TEST" - ":"
$ show symb other_number
OTHER_NUMBER = " 57"
$ write sys$output f$type(other_number)
INTEGER
$

Note also how you do not need to strips spaces or do an explicit integer convert.

fwiw,

Hein.

[Davor_7]

thanks all
i think the lexical function is very great :)

[Davor_7]

close it :p