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by Bo Tian
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Published on 2010-04-11T16:05:05Z
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2010/04/11
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I read a book that uses infix, infixr, and infixl in the sample programs. I'm wondering what the differences are. I'm guessing that infixr performs operation from right to left, and vice versa.
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I have this below function and it works
(fn x => x * 2) 2;
but for this below one, it is not working
(fn x y => x + y ) 2 3;
can anyone tell me why? or help give me some hint to get it to work.
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how do i prompt for user input in a running function?
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i need help enumerating all possible combinations of length n given a list of strings.
example, if my list was ["r","b","g"] and int 2
answer:
r r,
r b,
r g,
b r,
b b,
b g,
g r,
g b,
g g,
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I wonder how people handle nonexhaustive match warnings in the SML/NJ compiler. For example, I may define a datatype
datatype DT = FOO of int | BAR of string
and then have a function that I know only takes FOOs
fun baz (FOO n) = n + 1
The compiler will give a warning
stdIn:1.5-1.24 Warning:…
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please anybody having travelling salesman problem solution
in Standard ML, plz tell me.
I've tried a lot but am not successfull...
Thx in advance.
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