Talk:Middle three digits: Difference between revisions
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Because the middle three digits can have leading zeroes, I would think that the more natural return type would be a string rather than an int. --[[User:Paddy3118|Paddy3118]] 19:18, 3 February 2013 (UTC) |
Because the middle three digits can have leading zeroes, I would think that the more natural return type would be a string rather than an int. --[[User:Paddy3118|Paddy3118]] 19:18, 3 February 2013 (UTC) |
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: I didn't write that code, but I think I can explain it. The return type is a [http://dlang.org/phobos/std_variant.html#.Algebraic Variant] type that can represent ''any'' type. In this case it's limited to the types listed: string, char[]. So the function will return a Variant that represents either a string or a char[]. By looking at the returned type (peek) you can tell whether or not an error occured. [[User:Fwend|Fwend]] 21:54, 3 February 2013 (UTC) |
: I didn't write that code, but I think I can explain it. The return type is a [http://dlang.org/phobos/std_variant.html#.Algebraic Variant] type that can represent ''any'' type. In this case it's limited to the types listed: string, char[]. So the function will return a Variant that represents either a string or a char[]. By looking at the returned type (peek) you can tell whether or not an error occured. [[User:Fwend|Fwend]] 21:54, 3 February 2013 (UTC) |
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::Ah. I get it now. The middle three digits are calculated numerically and then changed to an array of three characters for the non-error return value. Error conditions return a string type. Thanks. --[[User:Paddy3118|Paddy3118]] 22:13, 3 February 2013 (UTC) |
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Revision as of 22:13, 3 February 2013
Inspiration
The idea for the task comes from this blog entry: Interesting interview question #1 by Michael Jasper. Thanks. --Paddy3118 12:41, 2 February 2013 (UTC)
Second D entry and return type
Because the middle three digits can have leading zeroes, I would think that the more natural return type would be a string rather than an int. --Paddy3118 19:18, 3 February 2013 (UTC)
- I didn't write that code, but I think I can explain it. The return type is a Variant type that can represent any type. In this case it's limited to the types listed: string, char[]. So the function will return a Variant that represents either a string or a char[]. By looking at the returned type (peek) you can tell whether or not an error occured. Fwend 21:54, 3 February 2013 (UTC)
- Ah. I get it now. The middle three digits are calculated numerically and then changed to an array of three characters for the non-error return value. Error conditions return a string type. Thanks. --Paddy3118 22:13, 3 February 2013 (UTC)