I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Finding Perfect Squares
Given an unsigned integer x, find the largest y by rearranging the bits in x
Swap the input arguments
What's Your BMI?
Create an n-by-n null matrix and fill with ones certain positions
Triangle Numbers Below N
Lychrel Number Test (Inspired by Project Euler Problem 55)
Specific Element Count
Determine if a Given Number is a Triangle Number
Clock Hand Angle 1
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