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I need a function which return the product of numbers in the string:
SomeFunc("1234") -> 1 * 2 * 3 * 4 = 24
Here is my code:
lists:foldr(fun(X, Y) -> X * Y end, 1, "1234").
But I get 6497400.
Why and how can I fix the code?
Your code is multiplying the ascii codes of the characters, i.e. 49*50*51*52. In order to get your desired result, use
where
$0is the ASCII code for the character ‘0’.