input problem in Developer Help

ID:138831
 
Oct 28 2011, 6:12 pm
Code:
mob
    var
        a = 0

verb
    abc()
        switch (input ("Select one option") in list ("a [a]","b","c")
    if ("a [a]")
        usr << "a"
    if ("b")
        usr << "b"
    if ("c")
        usr << "c"


Problem description:
As you can see, I put the "a" var in the "a" option of the input list, but, in the condition (if ("a [a]") it doesn't work.
It shows: "8:error: : expected a constant expression"
How can I put the "a" var in the condition?



#1 Oct 28 2011, 9:57 pm
Try var/AA = "a [a]" before switch(). If that still won't work then you cannot. Use if() else if() structure.
#2 Oct 29 2011, 3:17 am
Like the error tells you, if you're using switch(), then they all have to be constant expressions.

Solution: Don't use switch()
#3 Oct 29 2011, 7:43 am
In response to Immibis (#2)
Now it's like this:
mob
    var
        a = 0

verb
    abc()
        input ("Select one option") in list ("a [a]","b","c")
    if ("a [a]")
        usr << "a"
    if ("b")
        usr << "b"
    if ("c")
        usr << "c"

Errors:
7:error: list: undefined proc
8:error: : invalid expression
#4 Oct 29 2011, 7:47 am
In response to DarkHitz (#3)
DarkHitz wrote:
Now it's like this:
> mob
>     var
>         a = 0
>
> verb
>     abc()
>         input ("Select one option") in list ("a [a]","b","c")
>     if ("a [a]")
>         usr << "a"
>     if ("b")
>         usr << "b"
>     if ("c")
>         usr << "c"
>

Errors:
7:error: list: undefined proc
8:error: : invalid expression

You need to specify a variable for input() to return the selected choice to, e.g:

var/value = input("Input a number")as num
usr << value
#5 Oct 29 2011, 8:44 am
In response to Hashir (#4)
I just want to show the "a" var in the condition o_o
#6 Oct 29 2011, 10:28 am
In response to Hashir (#4)
No you don't, his problems are with indentation, not the input() line.
#7 Oct 29 2011, 11:19 am
In response to El Wookie (#6)
Actually Hashir is correct, when checking the value of an input() outside of switch() you need to set a variable to the value input() returns and check against that value. You can't just if(value) outside of switch() you need to if(variable == value).
#8 Oct 29 2011, 12:54 pm
In response to Nadrew (#7)
Technically I was not wrong, I was under the impression there was a switch() in there.

SADFACE
#9 Oct 29 2011, 6:19 pm
In response to Hashir (#4)
Hashir wrote:
DarkHitz wrote:
Now it's like this:
> > mob
> >     var
> >         a = 0
> >
> > verb
> >     abc()
> >         input ("Select one option") in list ("a [a]","b","c")
> >     if ("a [a]")
> >         usr << "a"
> >     if ("b")
> >         usr << "b"
> >     if ("c")
> >         usr << "c"
> >

Errors:
7:error: list: undefined proc
8:error: : invalid expression

You need to specify a variable for input() to return the selected choice to, e.g:

> var/value = input("Input a number")as num
> usr << value
>

You are not understanding...
I don't want to input the value, I want to show it in the option.
In the real code it is one room system, and it need to be like this: "Room 1 (4 players)", for example.
In this case, "a" var is the number of the players. I don't want to choose the number of the players. Just show it.
I made this "a" version because I thought it could make you understand better, but it don't G_G
#10 Oct 29 2011, 7:22 pm (Edited on Oct 30 2011, 1:58 am)
I can't believe how long this has gone on for such a small question. A short read of the switch documentation shows the values :

"must be constants" << Grr

You cannot specify a variable to be checked in a switch statement.

Here is how you would approach it:

        var/L = list("a [a]","b","c")
        var/R = input(usr,"Hello","Title",usr.name) in L

        if(R == "a [a]")
            usr << "You picked a [a]"
        if(R == "b")
            usr << "You picked b"
        if(R == "c")
            usr << "You picked c"


To be honest I think the switch statement has become surpassed by the input statement.
#11 Oct 29 2011, 10:30 pm
In response to DarkHitz (#9)
DarkHitz wrote:
Hashir wrote:
DarkHitz wrote:
Now it's like this:
> > > mob
> > >     var
> > >         a = 0
> > >
> > > verb
> > >     abc()
> > >         input ("Select one option") in list ("a [a]","b","c")
> > >     if ("a [a]")
> > >         usr << "a"
> > >     if ("b")
> > >         usr << "b"
> > >     if ("c")
> > >         usr << "c"
> > >

Errors:
7:error: list: undefined proc
8:error: : invalid expression

You need to specify a variable for input() to return the selected choice to, e.g:

> > var/value = input("Input a number")as num
> > usr << value
> >

You are not understanding...
I don't want to input the value, I want to show it in the option.
In the real code it is one room system, and it need to be like this: "Room 1 (4 players)", for example.
In this case, "a" var is the number of the players. I don't want to choose the number of the players. Just show it.
I made this "a" version because I thought it could make you understand better, but it don't G_G


It was just an example to show you how input() works.
#12 Oct 31 2011, 6:19 am
In response to Despa1r (#10)
Despa1r wrote:
I can't believe how long this has gone on for such a small question. A short read of the switch documentation shows the values :

"must be constants" << Grr

You cannot specify a variable to be checked in a switch statement.

Here is how you would approach it:

>       var/L = list("a [a]","b","c")
>       var/R = input(usr,"Hello","Title",usr.name) in L
>
>       if(R == "a [a]")
>           usr << "You picked a [a]"
>       if(R == "b")
>           usr << "You picked b"
>       if(R == "c")
>           usr << "You picked c"
>
>


To be honest I think the switch statement has become surpassed by the input statement.

It doesn't work.
#13 Oct 31 2011, 7:47 pm
In response to DarkHitz (#12)
I compiled it and tested it. I know it works. What is happening?
#14 Nov 1 2011, 4:21 am
In response to DarkHitz (#9)
 
mob
    var/a=0
    verb/abc()
        var/list/selection = list ("a [a]"="you selected a","b"="that\'s b","c"="c, the last option")
        var/select=input ("Select one option") in selection
        src << selection[select]


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