I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Check to see if a Sudoku Puzzle is Solved
04 - Scalar Equations 1
Back to basics - mean of corner elements of a matrix
Draw a 'X'!
Reverse the Words (not letters) of a String
Return the first and last characters of a character array
Inhomogenous Depth Scale Interpolation
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