Operands of Set Operators must be sets?

[Insectoid]

Erm, what does this mean? I get it when comparing a string to a part of a record that is a string.

I am trying to make a database & search engine because I thought it would be fun. But I ran into a snag, as pointed out above. Here is my code so far (will be changing it to read stuff from a file later)

Turing:

var num_entries := 1 var search_by : string var unitname : string var foc : string type unit_data :     record         name : string         nick_name : string         army : string         foc_slot : string         pointCost : int         unit_type : string         ws : int         bs : int         strength : int         toughness : int         wounds : int         initiative : int         attacks : int         leadership : int         save : int     end record var units : array 1 .. num_entries of unit_data units (1).name := "Fire_Warrior_team" units (1).nick_name := "Shas'La" units (1).foc_slot := "Troops" units (1).pointCost := 10 units (1).unit_type := "Infantry" units (1).ws := 2 units (1).bs := 3 units (1).strength := 3 units (1).toughness := 3 units (1).wounds := 1 units (1).initiative := 2 units (1).attacks := 1 units (1).leadership := 7 units (1).save := 4 proc search_by_name (search : string)     for check : 1 .. num_entries         if unitname in units (check).name then             put units (check).name         end if     end for end search_by_name put "Enter characteristic to search by:" get search_by if search_by = "Name" then     put "Enter part of the unit's name"     get unitname     search_by_name (unitname) end if

[[Gandalf]]

You're trying to use the in operator on a record (or actually, something even more misplaced, a string) when it only works on sets. You're basically using the in operator in a way it shouldn't be used, and for something it doesn't do.

If I'm correct in assuming what you're looking for:

code:

if index (units (check).name, search) ~= 0 then     put units (check).name end if

Should be the conditional statement. Note that this also takes care of another problem with your code... You're always checking for unitname in your procedure, which ruins the purpose of passing search as a parameter in the first place.

[Insectoid]

Quote:

You're trying to use the in operator on a record (or actually, something even more misplaced, a string) when it only works on sets. You're basically using the in operator in a way it shouldn't be used, and for something it doesn't do.

I was actually trying to make it work for any string, so I wouldn't have to write a separate procedure for every search type, and forgot to change it back afterwords.


I thought the 'in' operator was for strings...oops, thinking the wrong language, maybe that's for python...

code:

if index (units (check).name, search) ~= 0 then     put units (check).name end if

Will this work for partial matches or only perfect matches?

[[Gandalf]]

insectoid @ 2008-07-04, 10:13 am wrote:

code:

if index (units (check).name, search) ~= 0 then     put units (check).name end if

Will this work for partial matches or only perfect matches?

It'll work for partial matches. That's the reason index() was used, instead of just checking for equality.

[Insectoid]

Oh, thank you, will use!