MESSAGE
| DATE | 2016-04-26 |
| FROM | Christopher League
|
| SUBJECT | Re: [Hangout-NYLXS] fwiw with errors
|
From hangout-bounces-at-nylxs.com Wed Apr 27 00:07:47 2016
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From: Christopher League
To: Ruben Safir
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References: <571C204F.10504-at-mrbrklyn.com> <87shybrdl6.fsf-at-lydrik.home.lan>
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Subject: Re: [Hangout-NYLXS] fwiw with errors
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Ruben Safir writes:
> There should be a test to see if the symbol previously exists. If so,
> then test if it is the same type as the proposed data to be assigned to
> it. If so, good. If not, call the mixedtype error method.
Incidentally, I addressed exactly this issue in assignments 7 and 8. The
grammar of the calc language has been augmented with a `var` keyword for
the first time a variable is introduced. Then subsequent assignments
don't need the `var`. That's more like in C, although the type is not
specified because it's inferred from the initialization:
var x = 9
# blah blah
x = 3.14; # error because x has type int
We didn't actually need it if it's purely straight-line code. Without
ifs or loops, you can think of any assignment as creating a brand new
variable, so it doesn't matter if it changes type.
CL
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Ruben Safir [1]ruben-at-mrbrklyn.com writes:
There should be a test to see if the symbol previously exists. If
so, then test if it is the same type as the proposed data to be
assigned to it. If so, good. If not, call the mixedtype error
method.
Incidentally, I addressed exactly this issue in assignments 7 and 8.
The grammar of the calc language has been augmented with a var keyword
for the first time a variable is introduced. Then subsequent
assignments don't need the var. That's more like in C, although the
type is not specified because it's inferred from the initialization:
var x = 9
# blah blah
x = 3.14; # error because x has type int
We didn't actually need it if it's purely straight-line code. Without
ifs or loops, you can think of any assignment as creating a brand new
variable, so it doesn't matter if it changes type.
CL
References
1. mailto:ruben-at-mrbrklyn.com
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_______________________________________________
hangout mailing list
hangout-at-nylxs.com
http://www.nylxs.com/
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Ruben Safir writes:
> There should be a test to see if the symbol previously exists. If so,
> then test if it is the same type as the proposed data to be assigned to
> it. If so, good. If not, call the mixedtype error method.
Incidentally, I addressed exactly this issue in assignments 7 and 8. The
grammar of the calc language has been augmented with a `var` keyword for
the first time a variable is introduced. Then subsequent assignments
don't need the `var`. That's more like in C, although the type is not
specified because it's inferred from the initialization:
var x = 9
# blah blah
x = 3.14; # error because x has type int
We didn't actually need it if it's purely straight-line code. Without
ifs or loops, you can think of any assignment as creating a brand new
variable, so it doesn't matter if it changes type.
CL
--==-=-=
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Ruben Safir [1]ruben-at-mrbrklyn.com writes:
There should be a test to see if the symbol previously exists. If
so, then test if it is the same type as the proposed data to be
assigned to it. If so, good. If not, call the mixedtype error
method.
Incidentally, I addressed exactly this issue in assignments 7 and 8.
The grammar of the calc language has been augmented with a var keyword
for the first time a variable is introduced. Then subsequent
assignments don't need the var. That's more like in C, although the
type is not specified because it's inferred from the initialization:
var x = 9
# blah blah
x = 3.14; # error because x has type int
We didn't actually need it if it's purely straight-line code. Without
ifs or loops, you can think of any assignment as creating a brand new
variable, so it doesn't matter if it changes type.
CL
References
1. mailto:ruben-at-mrbrklyn.com
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_______________________________________________
hangout mailing list
hangout-at-nylxs.com
http://www.nylxs.com/
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