State the example of pre- and post-conditions, Data Structure & Algorithms

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State the example of pre- and post-conditions

Suppose that function f(x) should have a non-zero argument and return a positive value. We can document these pre- and post-conditions in comments and incorporate a check of the precondition in this function's definition, as demonstrated below

# Explanation of what f(x) computes

# @pre: x != 0

# @post: @result > 0

def f(x)

raise ArgumentError if x == 0

...

end

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