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Write a version of sumPairs of Ex. 3.1.8 that sums each component of the pairs separately, returning a pair consisting of the sum of the first components and the sum of the second components. So basically [(3,1)(10,3)] would return (13,4).
Ex. 3.1.8
fun sumPairs(nil) = 0
| sumPairs((x,y)::zs) = x + y + sumPairs(zs);
I'm trying to do this by using the let, in, and end. Here is what I have so far:
| sumPairs((x,y)::zs) =
let
val P = x + sumPairs(zs);
val Q = y + sumPairs(zs)
in
sumPairs(P,Q)
end;
Unfortunately, it does not work.
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